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How SailGP’s foiling F50 catamarans sail so much faster than the wind

Arguably the most technologically advanced sailboats on the planet right now, the one-design SailGP F50 foiling catamarans are capable of breathtaking speeds – at times, reaching four times the velocity of the wind that drives them. But how do they do it?

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Sailboat Stability Uncensored

The merits and limitations of the calculated gz curve..

At its most basic level, my goal as a sailor is pretty simple: keep my neck above water. Speed, comfort, progress toward a destination are nice, but if I need gills to achieve any of these, something is amiss. And since an upside-down boat tends to interfere with this modest ambition, I’d say our recent obsession with stability is justified.

This is far from our first foray into this topic. Shortly after the 1979 Fastnet race disaster , in which 15 sailors died, Practical Sailor embarked on a series of articles on sailboat stability. The racing rules of that era had resulted in designs that were quicker to capsize than their heavier, more conservatively proportioned predecessors, and we needed to explore why.

Since then, the lessons of Fastnet have been absorbed by the design community, culminating with the CE Category system and formulas used by various racing bodies like the Offshore Racing Congress to evaluate a boat’s fitness for the body of water where it will sail. But it’s clear that the tools we use to measure stability, and the standards we’ve established to prevent future incidents are still imperfect instruments, as we saw in the fatal WingNuts capsize in 2011 . And in the cruising community, where fully equipped ocean going boats hardly resemble the lightly loaded models used to calculate stability ratings, we worry that the picture of stability is again becoming blurred by design trends. This video gives some insight into the dockside measurement process for racing boats.

Last month, we examined multihull stability , including an analysis of several well publicized capsizes. One of the key takeaways from that report was the significant impact that hull shape and design can have on a multihull’s ability to stay upright. Another key observation was the distinction between trimarans and cats, and why lumping them together in a discussion of stability can lead to wrong conclusions. As we pointed out, many of the factors that determine a multihull’s ability are related to hull features—like wave-piercing bows—that are difficult to account for when we try to calculate stability.

This month, we take another look at monohull stability. This time it’s a formula-heavy attempt to tackle the conundrum that many cruising sailors face: How can I know if the recorded stability rating for my boat reflects the reality of my own boat? Or, if there is no stability rating from any of the databases, like the one at US Sailing, how do I assess my boat’s stability?

Stability Resources

If you are unfamiliar with this topic, I’d recommend reading three of our previous reports before digging into this month’s article. “ Dissecting the Art of Staying Upright ” and “ Breaking Down Performance ,” both by PS editor-at-large and safety expert Ralph Naranjo, take a broad view of sailboat design elements and how they applies to contemporary sailors. Nick Nicholson an America’s Cup admeasurer and former PS Editor, also offers a succinct discussion of stability in his article, “ In Search of Stability ,” which I recently resurrected from the archives. (Nick, by the way, is no relation to the current editor.)

When we’re talking about stability, the essential bit of information that every sailor should be familiar with is the GZ curve. This graphic illustration of stability highlights the boat’s maximum righting arm, the angle of heel at which resistance to capsize is greatest. It also illustrates the angle of vanishing stability (also called the limit of positive stability), the point at which the boat is just as likely to turn turtle as it is to return upright. Most boats built after 1998 have a GZ curve on file somewhere, and US Sailing keeps a database of hundreds of boats for members. As this month’s article points out, however, the published GZ curve does not always perfectly transfer to our own boats. Nevertheless, it is usually a good benchmark for assessing your boat’s stability ratio—not to be confused with capsize ratio the stability index or STIX .

For a succinct discussion of stability ratios (see below), Ocean Navigator’s excerpt from Nigel Calder’s Cruising Handbook lays good groundwork for the theory. If you really want to dive into the topic, Charlie Doane presents a good overview in this excerpt from his excellent book “ Modern Cruising Design .” Doane, like many marine journalists, relies greatly on the work of Dave Gerr , former director of the Westlawn Institute of Yacht Design and now a professor with SUNY Maritime Institute. Gerr’s four books “ Propeller Handbook ,” “ The Nature of Boats ,” “The Elements of Boat Strength,” and “Boat Mechanical Systems Handbook,” all published by McGraw Hill, illustrate Gerr’s rare talent for taking complicated topics and making them comprehensible and fun to read.

The GZ Curve

Shaped like an “S” on it’s side, the GZ curve illustrates righting lever. The high peak represents a boat’s maximum righting arm (maxRA), the point at which the forces keeping the boat upright (ballast, buoyancy) are strongest. The lowest valley, which dips into negative territory, represents the minimum righting arm (minRA), the point at which these forces are weakest. The curve also clearly delineates the limit of positive stability (LPS, also called the angle of vanishing stability), where the curve crosses into negative territory. Generally speaking, an offshore sailboat should have an LPS of 120 degrees or more. As Naranjo puts it, “It is this ability to recover from a deep capsize that’s like money in the bank to every offshore passagemaker.”

• Notice how lowering ballast lowers the center of gravity (CG) and increases a vessel’s limit of positive stability. In these examples, three identical 30 footers with the same amount of ballast, but differing keel stub depths, alter their draft and GZ curves. Boat 1 (5’ draft), Boat 2 (6’ draft) and Boat 3 (4’ draft). Note that Boat 3, the shoal draft option, has the lowest LPS and Boat 2, has the deepest draft, highest LPS and will sail to windward better than the other two boats. Editor’s note: One would think that with all the reporting we’ve done on stability, we’d be able to label a GZ curve correctly, but in the print version of the March 2021 issue we have mislabeled the curve. I apologize for the error. Sometimes, despite our best efforts, our own GZ curve turns turtle during deadline week. The correct version of the curve appears in the online issue and in the downloadable PDF. If you have questions or comments on boat stability, please feel free to contact me by email a [email protected], or feel free to comment below.

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17 comments.

Thanks for this reminder, another error has crept into the diagrams I think. The yacht seems to have 2 CBs and no GG.

I noticed that also, Halam. With no center of gravity and all buoyancy that boat will never sink. Of course, it could be at rest upside down also.

The link to the US Sailing database is pointing to a different place than I think you intended. It is not the database of boats, but rather information on curve calculation and definitions.

Hi Darrell, sorry to be the bearer of a correction, but it looks like the CG is labeled as CB in the first graphic.

As far as I know, a rule of thumb is that a sail boat can tolerate cross breaking waves not higher than her max beam. Is it true?

It often amuses me to see the many crew sitting out on the gunwale of a keel boat, (monohull) as the righting effect must shorely be minimal. Especially when compared to a small racing trimaran. It does help the ‘Gyration’ as shown in the Fastnet tragedy. Even the ‘Skiffs’ have ‘racks’ out the side, & I’ve seen all sorts of ‘keel arrangements’. They just haven’t put ‘floats’ on the end yet. I’d love to see someone do a ‘stability kidney’, as Lock Crowther said (all those years ago), the the righting, (capsizing force is 35? degrees off the bow. Thought provoking? not antaganistic. Keep up the good work, and thanks ‘B J’.

A useful view of stability is to consider where the energy to resist capsize is stored. As a boat rolls, the center of gravity is also raised with respect to the center of buoyancy, so the weight of the boat is lifted, at least through some angle (as long as the GZ is positive) and energy is stored as a lifted weight. This means that a stability incident is exactly equivalent to rolling a ball up a hill; it will always roll back down until it passes over the top of the hill. This is why most commercial and military stability standards use “righting energy” for at least one criteria. The ISO 12217-1 standard for coastwise and oceangoing power boats requires at least a minimum absolute energy and an energy ratio exceeding a nominal overturning energy of combined wind and wave (similar to the IMO standards for cargo ships and 46 CFR 28.500 for fishing vessels).

Can anyone comment on the stability of Volvo Ocean Race boats? While various mishaps have occurred over the years, I don’t believe any of them have capsized and remained inverted. VOR boats are nothing like the Pacific Seacraft and similar designs from more than 50 years ago, yet they seem “safe”.

Does anyone know why? Size, keel depth and weight, modern design tools?

Good and useful article, particularly to someone considering buying a new or used sailboat. As an add-on to the effect of draft, I would add that most, if not all, builders increase the weight of the keel to try to compensate for the reduction of righting moment with the reduction in draft. I recommend to readers Roger Marshall’s outstanding book entitled “The Complete Guide to Choosing a Cruising Sailboat”. Chapter 3 “Seaworthiness” and chapter 10 “Putting it All Together” are worth the cost of the book many times over. Unfortunately the book is getting out of date, it was published in 1999 and many newer sailboats have come on the market.

Mark, thank you for recommending to read Roger Marshall’s book.

May i suggest reading the book, “Seaworthiness the forgotten Factor”. The author (C.J.Marchaj) makes a number of interesting observations about modern boat design (published in ’86, so not that modern). What sticks with me is the notion that one aspect of seaworthiness is how well a person can survive inside the boat in question– deeper keels make for more righting moment but also a snappy roll, for example, promoting incapacitating seasickness. The boat has to be well enough behaved to “look after” the crew.

My boat 40 ft Samson SeaFarer ketch is fairly tender initially but then settles down once the rail is int he water….but I have never had the top of the mast in the water to see if it would recover well. Since I am not and engineer or math whiz (and don’t want to be!) I wonder if there is a practical way to actually test the stability while on the water. Is there a way for example to pull the top of the mast down to varying degrees/angles and measure the force it takes to do it and use that as a guide to stability. Could that provide some extrapolative certainty to going further around the wheel of misfortune? Crossing between NZ and Australia (45 years ago..) we were knocked over (not my current boat) with the top third of the mast in the water and she righted very quickly (very comforting) – no great mishap except to make the cook go wash the soup out of his hair and confirm all the things we hadn’t tied down…including dishevelled crew.

Cheers Gerry

Can someone please link to the article referenced above on multihull stability? I’ve searched, but cannot find it. Thank you kindly!

I have the same inquiry as Jet. I can’t find the Multihull article. Please advise ASAP!

The link in the 4th paragraph works for me:

https://www.practical-sailor.com/sailboat-reviews/multihull-capsize-risk-check

Couldn’t find this link either. Thanks.

Is it possible to get a link to the USSailing boat database, or some hints on where to find it on the site? The current link just goes to ussailing.org.

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This New America’s Cup Racing Yacht Flies 3 Feet Above the Water

The new ac9f will be sailed in a special america's cup event for younger sailors representing 12 countries., michael verdon, michael verdon's most recent stories.

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The 2021 Youth America’s Cup took a big step forward with the successful sea trials of the event’s first boat. The AC9F, a 29.5-foot-long foiling monohull, was designed and built by Yachting Developments in New Zealand . It reaches a top end of about 23 mph. It’s a smaller, slower and safer version of the America’s Cup AC75, the 75-foot foiling monohull with 11 crew that will sail in the 2021 America’s Cup. It can reach speeds of more than 60 mph.

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In the Youth America’s Cup, AC9F racing yachts will be crewed by two males and two females, from 18 to 24 years old. Announced last December, the event quickly attracted 15 teams from 12 countries, including two from New Zealand, where it will be held, two from Australia, two from Switzerland, as well as single teams from the US, China, Italy, U.K., Spain, Russia, Argentina, Hong Kong, China, Denmark, and Germany. The number is far higher than the five teams competing for the adult America’s Cup.

“The Youth America’s Cup is something we have been eager to see established since we won the America’s Cup in 2017,” says Grant Dalton, CEO of Emirates Team New Zealand (ETNZ), the America’s Cup Defender.

The 23-foot foiling monohull is a mini-version of the much larger and faster 75-ft. AC75. 

“I am blown away by the interest,” said Hayden Porter, CEO of the Royal New Zealand Yacht Squadron (RNYZYS) which, along with Team New Zealand and China Sports Industry Group, is sponsoring the youth event. “Once people also see the AC9F sailing, the global interest level will step up a notch. Being an event with gender equality at the forefront has also proven to be popular and something that was important to us from the start.”

The first AC9F, Kōtare or “Kingfisher” in Maori, was launched in March, but the testing was delayed for months because of Covid-19 protocols. New Zealand last week announced it was opening up the country.

“We still have more testing to complete but after her first sail it is good to confirm that she certainly flies,” says Ian Cook, managing director of Yachting Developments.

The AC9F will have four sailors–two males and two females–that will use the experience they gain on the foiling monohull as a springboard to future America’s Cups. 

The most recent 2017 America’s Cup used AC62s, a 62-foot wingsail catamaran that could reach speeds of 54.3 mph. This year’s AC72 will be an entirely different design, based on a 75-foot, carbon-fiber monohull that lifts out of the water on two foils. It will have a crew of 11 and will have a top speed of about 63 mph.

The AC9Fs by contrast, are significantly smaller and not as difficult or dangerous to sail. But they will allow the younger sailors—who aspire to sail in future America’s Cups—to learn the behavior of a foiling monohull, while competing before large crowds during the America’s Cup challenger series and finals. Seven AC9Fs will be built for the events and shared between the teams.

The goal of the sponsors is to “reinvigorate” the youth program for future America’s Cup events, but it’s also the first time a yacht of this caliber has been developed for youth sailors.

Te Aihe, Team Emirates New Zealand’s first AC75, is much faster than the AC9Fs, capable of speeds of more than 60 mph. The racing yacht also has 11 crew.  Team Emirates New Zealand

“We believe the format and boat we have created encourages diversity and leaves an insurmountable legacy for our 150th year as well as for the future of youth sailing,” says Aaron Young, vice commodore of RNZY. “The development of future talent is paramount to the success of yachting around the world. We intend to have this event permanently embedded into future AC events.”

Wan Weidong, chairman of China Sports Industry Group, said his country, while participating in this America’s Cup, also needs to “pay more attention to fostering the next generation of top-level racers.”

“It was impressive work by everyone involved to achieve our goals so quickly,” said Bob Graham, lead designer at Yachting Developments, about the design, build and launch of the racing yacht in three months. “The Youth America’s Cup will be an unmissable chance to bring young sailors from around the world to race an exciting design demanding the best of all their skills.”

Seven identical AC9Fs will be built for the youth event and teams will share the boats for match races. 

The first event of the Youth America’s Cup is scheduled to take place in November in China, with the dates yet to be determined, and the following events will take place in February, 18-23, 2021 and March 8-12, 2022.

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This All-Electric Hydrofoil Boat Lets You Fly Above the Waves

The Candela C8 looks like a regular powerboat. But when it gets up to speed, this futuristic leisure craft emerges from the water for a virtually silent ride.

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Swedish company Candela wants to totally rethink the world of luxury leisure boats. No fossil fuels, no noisy motors, no bouncing up and down on waves. In fact, when you get up to speed in the company's latest leisure boat, you're not sailing on the water at all -- you're flying above it.

The Candela C8 leisure boat looks like something you might see in a James Bond film. One moment, it's pushing through the water, the next, it emerges from the waves and seems to be floating on stilts. But this all-electric hydrofoil is actually designed to solve one of the major problems with power boats: energy efficiency. 

"Conventional speedboats are actually some of the most energy-inefficient craft on the planet," says Candela communications manager Mikael Mahlberg over a Zoom call from Sweden. "A conventional planing hull uses 15 times as much fuel per kilometer as a family car."

The Candela C8 electric hydrofoil leisure boat.

But while making a powerboat all-electric might solve the problem of fossil fuel use, it still doesn't solve one of the issues of basic physics. Dragging the hull through the water creates a huge amount of friction, which in turn means an electric boat needs a lot of power to operate. As a result, Candela says even an electric boat with a large battery would be drained in as little as 30 minutes.  

To solve this problem, Candela added a hydrofoil to its electric boat to lift the hull out of the waves. A hydrofoil works in the same way as the wing on an airplane: Just as air moving over the wing of the plane creates lift, water passing over the hydrofoil pushes the boat up and out of the water, cutting drag by about 80%. As a result, the C8 can cover the whole San Francisco Bay after a two-hour charge -- a range of roughly 50 miles. 

It's not just the hydrofoil that makes this boat different from a regular powerboat. Candela also changed the design of its motor --  taking the traditional gas motor off the back of the boat and replacing it with a highly efficient direct-drive motor, known as the C-Pod, which sits below the hull and powers through the water like a torpedo. 

"My God, it's so silent," Malhberg says. "You have the motor under the water, so there's no transmission noise at all, so it's just silence. It's like a magic carpet ride."

The C8 went on its maiden flight in Sweden in February, and the company is now taking preorders, starting at 290,000 euros excluding tax, or roughly $330,000. Boats can be customized with optional extras like a built-in sound system, radar or even a freshwater shower. 

As for who needs their own electric hydrofoil? Candela is targeting the leisure boating market as well as environmentally conscious buyers. (Why not match the Tesla in your garage with an electric boat down at your dock?) And it may even pick up a few aviation enthusiasts. 

"You don't feel the waves hitting the hull, it's silent and you're unaffected by the sea state, so it's a bit like merging flying and boating," says Mahlberg. "It's a very magical feeling."

Celebrate 60 years of James Bond's cars, boats and more at Bond in Motion

This sailboat hovers above the water

Image: Tilly Lock, YouTube

You might spot an interesting-looking sailboat in Mission Bay, a boat that moves fast and appears to hover just above the water. These small sailboats are called Moths and there's plenty of science and engineering that went into making this watercraft the agile speedster that it is.

How does the boat lift out of the water and how does this design increase performance? What can we see above the water and what is not visible under the water? How does an airplane lift upwards and how are those principals similar and different than those on a Moth?

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These Insane Surfboards Let You Glide Above Water, No Muscle Required

They're still in the prototype stage, but watch this space.

If you've ever wanted to feel like you're walking on water, Kai Concepts ' Jetfoiler is the surfboard of your dreams. The motorized machine uses hydrofoil to hover over the water's surface and travel at speeds you wouldn't normally reach on a board without ample effort.

Designed by former Bay Area sail and kite surfer Don Montague and a team of engineers, inflatable designers, windsurfers, and kitesurfers, the board is made with the same type of composite material that's used in high-end race boats. The board and foil — the foil being the underwater fin responsible for its lift — together create a strong craft that's still light enough to carry.

Hydrofoil technology makes you feel like you're flying on a magic carpet over the water. Once the board starts to move, the foil gives it a lift to decrease the drag, according to the company's project manager, Betsy Pfeiffer. The "Airfoiler," the Jetfoiler's predecessor, was able to reach 34 knots (about 39 mph) during initial testing.

The Jetfoiler has remained in the prototype stage since 2016, but when it finally hits the market, it will allow its passenger to kitesurf without high winds. The motorized board will be a helpful learning tool for those interested in trying the sport at a beginner level, Montague hopes. It's also a great kitesurfing alternative suitable for all ages and abilities.

The board is being tested with both a wireless and wired remote control that could be used to propel the motor's speed while the passenger's feet steer its direction.

Before he created the Jetfoiler, Montague cofounded the San Francisco Bay Area wind power company Makani Power, which founded airborne wind turbine technology (in which rotors are suspended in the air without towers) and was later acquired by Google. This venture into wind power is what inspired Montague to start experimenting with hydrofoils, leading to several other innovative products the company has created — like its kiteboat , "a foiling trimaran pulled by a kite that can sail three times the wind speed."

Even though it hasn't yet reached the market, the Jetfoiler has traveled far beyond the Bay Area, where it was founded. Montague has even used it to travel the famous canals of Amsterdam, according to the project's Instagram .

Pricing and time of sale will be determined at a later point, Pfeiffer said.

Bridge Clearance

Do you ever need to know the tide heights if you're not crossing a shallow bar? Maybe.

It could be that problems arise above the water. A low bridge can block passage for fly-bridge cruisers and sailboats on high tide, yet let them pass with space to spare on low. Sometimes even runabouts can be blocked by low-hanging roadways.

You obviously need to know your boat 's bridge clearance if you navigate anywhere that passage beneath one of these structures is common. The bridge clearance (BC) refers to the height from the waterline (where the surface meets the hull) to the highest point of any structure on the boat, including the mast, tuna tower, or outriggers. (If your radio antennas and riggers fold down, you don't have to measure them in the equation.)

Boat Bytes_

It's always best to punch around in the backwaters on a rising tide, and to head back for deeper water shortly before the tide peaks and starts to run back out. That way, if you go aground inside, the rising water gives you a good chance to get off anc escape; while if you ground on falling water, you're stuck until the next incoming tide.

Boater-ese.

Bridge clearance (BC) is

the distance from a boat's waterline to the highest point on the topsides. It indicates the height of a bridge under which a boat can pass.

Bridge clearance is listed on marine charts, with the height above mean high water given. So, if you want to pass under a bridge that has 20-foot listed clearance with your sport-fisherman boasting a BC of 19'6'', you aren't going to be able to get through at the peak of a spring tide that's a foot taller than normal high tide (more on spring tides later in this chapter). On the other hand, you can get through that bridge with a 19-foot listed clearance on the bottom of a -1.0 low.

Bet You Didn't Know

In most areas there's a normal progression through four tides, but some days have only three tides. How can this be?

As the 50-minute-per-day regression takes place, the P.M. tide gradually advances past midnight, thus leaving one 24-hour period without four tides, even though the tidal movements maintain their steady procession.

Continue reading here: If Your Boat Springs a Leak

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Readers' Questions

How to determine if a bridge should be tall or movable to allow ships to pass under it?

There are several factors that need to be considered when determining if a bridge should be tall or movable to allow ships to pass under it. Height of the ships: The height of the ships that will be passing under the bridge is one of the most important factors to consider. The bridge needs to be tall enough to accommodate the highest ships that will be using the waterway. Frequency of ship traffic: If the waterway sees a high volume of ship traffic, it may be more practical to build a movable bridge that can easily be raised and lowered to allow ships to pass through. This can help to reduce congestion and delays for both road and water traffic. Cost and feasibility: Building a tall bridge may be more costly and require more engineering and construction expertise than building a movable bridge. The cost and feasibility of each option need to be carefully considered before a decision is made. Environmental impact: Building a tall bridge may have a bigger impact on the surrounding environment compared to a movable bridge. Environmental factors such as wildlife habitats, water quality, and scenic views need to be taken into account. Regulatory requirements: There may be specific regulations and requirements that dictate the design and construction of bridges over waterways. These regulations may specify the maximum height of the bridge, the types of ships that need to be accommodated, and other considerations that need to be taken into account. Ultimately, the decision to build a tall or movable bridge will depend on a combination of these factors and will require careful planning and consideration to ensure that the bridge meets the needs of both road and water traffic.

What is the maximum bridge clearance of a 2002 sea ray 360?

The 2002 Sea Ray 360 has a maximum bridge clearance of approximately 18 feet 10 inches or 5.7 meters.

What clearance does a bridge need for boat sto sfaley pass?

The clearance required for a bridge to safely pass boats will vary depending on the size and type of boats that typically travel in the area. Typically, for small pleasure boats and small commercial vessels, a clearance of at least 15-20 feet is usually sufficient. However, for larger vessels such as sailboats and yachts, a clearance of at least 50 feet or more may be needed. It is important to consider the height of the masts and antennas of the boats that will be passing under the bridge when determining the necessary clearance.

How tall is the bridge between cross lake and rush lake for boats?

I'm sorry, but I couldn't find any specific information about a bridge between Cross Lake and Rush Lake in my database. Could you please provide additional details such as the location or any other names associated with the bridge?

What is the clearance under the boston university bridge?

The clearance under the Boston University Bridge is approximately 21 feet.

How tall is a bertram with a flybridge in feet?

The height of a Bertram with a flybridge can vary depending on the specific model and design features. However, on average, a Bertram with a flybridge may have a height ranging from around 14 to 18 feet.

How to read bridge information sailboat?

To read bridge information on a sailboat, you can follow these steps: Understand the types of bridges: Familiarize yourself with different types of bridges that you may encounter while sailing, such as fixed bridges, swing bridges, lift bridges, bascule bridges, and pontoon bridges. Consult nautical charts: Use nautical charts specific to the area you are sailing in. Nautical charts will provide detailed information about bridge locations, clearance heights, opening schedules, and other relevant details. Identify bridge symbols: On nautical charts, bridges are typically marked with specific symbols. Learn to recognize and interpret these symbols to identify the type of bridge and its characteristics. Note vertical clearance: Pay attention to the vertical distance between the waterline and the bridge structure. This information will help you determine if your sailboat can safely pass under the bridge without any height restrictions. Check the opening schedule: For movable bridges, consult the nautical charts or contact local authorities to determine the bridge's operation schedule. It is essential to be aware of any specific opening times and restrictions to plan your sail accordingly. Use official publications: Utilize official sailing publications like the United States Coast Pilot or similar guides for bridge information. These publications provide additional details such as radio frequencies to contact bridge operators and any special considerations. Listen to VHF radio communications: While sailing near bridges, monitor the VHF radio channels that bridge operators use. They may provide updates on the bridge status, closures or any specific instructions for sailing through. Keep a lookout: Maintain a sharp lookout for any visual signs or signals displayed by the bridge operators, such as lights, flags, or signs. These signals may indicate whether the bridge is open or closed to vessel traffic. Plan your route: Consider the bridge clearances, opening schedules, and other navigational factors when planning your sailing route. Ensure to account for any potential delays caused by bridge operations and adjust your schedule accordingly. Follow navigation rules: When approaching and passing through bridges, ensure you adhere to navigation rules and any instructions provided by bridge operators. Maintain a safe distance and follow any direction to pass safely. Remember, bridge information can change, so it is crucial to stay updated with the latest charts, local notices, and radio communications to ensure a safe and hassle-free sailboat journey.

How tall a ship can fit under the newportpell bridge?

The height clearance under the Newport Pell Bridge, located in Newport, Rhode Island, is approximately 207 feet (63 meters). This gives ships with a height of up to 207 feet the ability to pass under the bridge safely.

What does horizontal bridge clearance mean on a boat?

Horizontal bridge clearance on a boat refers to the measurement of the distance between the waterline and the highest point on the boat that could potentially collide with a bridge or other overhead obstruction when passing underneath it. It is an important consideration for boat operators to prevent damage to the boat and ensure safe navigation in areas with low bridge clearances.

What is the hight of a 50 azimut yacht?

The height of a 50-foot Azimut yacht can vary depending on the specific model and design. However, a general estimate for the height of a 50-foot Azimut yacht would be around 20-25 feet. It is always best to consult the manufacturer's specifications or contact the specific model's seller for precise measurements.

What is the max height of a boat to go under 8.5’ canal bridge coral gables?

The maximum height of a boat to go under an 8.5' canal bridge in Coral Gables is usually around 7.5 - 8 feet. This allows for some clearance between the boat and the bridge to ensure safe passage. It is important to always check the specific bridge clearance height as it can vary depending on factors such as tides and construction.

What is reasonable bridge span length to allow passage of sail boats?

The length of a reasonable bridge span for sailboats can vary depending on several factors, such as the type and size of sailboat, the height of its mast, and the location of the bridge. In general, a bridge span length of around 65 feet (20 meters) is considered reasonable to allow passage for most sailboats. However, larger sailboats with taller masts may require bridges with higher clearances or even drawbridges that can be opened to accommodate their passage. It is important for bridge designers and operators to consider the local boating traffic and ensure sufficient clearance for safe passage of sailboats.

What is the highest clearance under jubilee bridge in highest tides?

The Jubilee Bridge, located in Cornwall, England, has a fixed clearance of approximately 5 meters (16 feet) at mean high water springs. Therefore, the highest clearance under the bridge during the highest tides would also be around 5 meters.

What is max bridge clearance for ships?

The maximum bridge clearance for ships varies depending on various factors including the design of the ship, its size, and the waterway it is navigating. The bridge clearance refers to the vertical distance between the waterline and any overhead structure that the ship needs to pass under, such as a bridge or powerline. In general, larger ships have a lower maximum bridge clearance due to their size and draft. For example, large container ships or oil tankers may have a bridge clearance of around 55 meters (180 feet) or less. On the other hand, smaller vessels like yachts or pleasure boats typically have a higher bridge clearance, usually ranging from 10 to 20 meters (33 to 66 feet). It is important for ship operators and captains to be aware of the maximum bridge clearance to ensure safe passage and avoid any collisions or damage to the ship or overhead structures. Navigation charts, local regulations, and communication with control towers or bridge operators are crucial in determining and maintaining a safe clearance for ships.

How tall are bridges on the interstate?

The height of bridges on the interstate can vary depending on the location and construction standards. Typically, the minimum clearance height for interstate bridges is around 16 feet or 4.9 meters. However, there can be exceptions where certain bridges may have lower clearance heights due to various factors such as road design, geography, or infrastructure age. It is important to note that these measurements may vary and it is always advisable to follow posted clearance signs and height restrictions to ensure safe passage.

What size boat can get under whitten neck bridge nh?

I'm sorry, but as an AI language model, I don't have access to specific data such as the height of the Whitten Neck Bridge in New Hampshire. However, typically, the clearance height of bridges is indicated by signs or local regulations. I would recommend contacting local authorities or boating associations in the area for accurate information about the clearance height of the Whitten Neck Bridge and the size of the boat that can safely pass underneath it.

What foot clearance for a bridge does a new 26 twinvee need?

The foot clearance for a bridge required by a new 26 Twin Vee boat may vary depending on local regulations, construction standards, and the specific design characteristics of the boat. It is recommended to consult the manufacturer's documentation or contact the Twin Vee company directly for accurate information regarding the required foot clearance for bridges.

What is the height above the waterline of a norman 23 motor cruiser?

The Norman 23 Motor Cruiser has a height of approximately 6 feet above the waterline.

How to calculate bridge clerance from vessel?

The bridge clearance is the height of the lowest overhead part of the ship's superstructure above the waterline of the vessel. To calculate bridge clearance, you will need to measure the distance from the waterline of your vessel to the lowest point of your superstructure. Subtract the waterline measurement from the superstructure measurement to get your bridge clearance.

What is the minimum and maximum clearance on the underside of a bridge?

? The minimum clearance on the underside of a bridge is typically determined by the load capacity of the bridge and the height of the bridge deck above the water. The maximum clearance is usually determined by the height of the waterway below the bridge.

What is bridge clearance of a 2006 sea ray 260 when on a boat trailer videos?

The bridge clearance for a 2006 Sea Ray 260 when on a boat trailer is 8' 6".

What is the bridge clearance for a 1981 55ft, sea ranger pilothouse trawler?

The bridge clearance for a 1981 55ft Sea Ranger Pilothouse Trawler can vary depending on which model you have, but in most cases it will be anywhere from 19ft to 21ft.

How high a bridge should be above the river for boats to pass through?

The answer to this question depends on the size of the boats that will be passing through the river. Generally, bridges need to have a clearance of at least a few meters (typically 6-12 m) above the highest expected water level in order to ensure that the boats can pass underneath safely.

Can a sail boat go under the lyndon johnson bridge?

No, sailboats typically cannot travel under the Lyndon B. Johnson Bridge due to its height restrictions. The bridge spans 177 feet above the water, which is too high for sailboats to travel safely underneath.

What size boat can go under the bridge into surfers?

paradise The size of boat that can go under the bridge into surfers paradise would depend on the height of the bridge and the size of the boat. Generally, boats that have a beam (width) of less than 7'10" and a mast (height) of less than 22' can pass beneath the bridge.

Do boats fit uner the ponte cestio?

Yes, boats can fit under the Ponte Cestio, which is a bridge located in Rome, Italy. The bridge has a clearance of around 8.5 meters, which should be high enough to allow most boats to pass underneath.

How to find a boats bridge clearance?

To find a boat's bridge clearance, first take a look at the bridge itself. Get the exact measurements of the bridge and make sure you know the height of the water when you plan to be traveling under it. This will help you determine what your clearance will be. If you are uncertain, contact the bridge operators and inquire. They should be able to provide the height of the bridge, as well as the depth of the water when you plan to pass underneath it. This will help you calculate your exact bridge clearance.

What bridge clearance does a 30 foot sea ray cruiser need?

The recommended bridge clearance for a 30 foot Sea Ray Cruiser is at least 11 feet.

What is the bridge clearance for a nordhavn 64?

The bridge clearance for the Nordhavn 64 is approximately 15 feet.

What is the clearence of the rt 54 bridge in high tide fenwick island?

The RT 54 Bridge in Fenwick Island does not have any specific clearance due to high tide. The U.S. Coast Guard maintains a navigation channel under the bridge that is 15 ft. deep at mean low water and has a vertical clearance of 35 ft. at mean high water.

What is the maximum bridge height clearance for a sea ray sundancer 260?

The maximum bridge height clearance for a Sea Ray Sundancer 260 is 13 feet 0 inches (3.96 meters).

Can a pontoon boat fit under a bridge that is 7'4?

" tall No, most pontoon boats have a bridge clearance of 8 to 10 feet.

What does trans am height mean on a boat?

Transom Amidships Height (TAH) is the distance from the waterline to the top of the transom. This measurement will often be used when choosing the right outboard or inboard motor for a boat.

How tall is average bridge height?

The average bridge height varies significantly depending on the type and purpose of the bridge. Generally speaking, the average height of a highway bridge is around 15 meters (50 feet), while a railway bridge averages around 21 meters (70 feet).

What is the boat clearance on the sundance bridge, southport?

The bridge clearance for most boats is 25 feet.

How hight is the sundale bridge for a fly ridge boat?

The Sundale Bridge has an Air Draft of 24 feet 6 inches.

How do you figure out bridge clearance of a boat?

The best way to calculate the bridge clearance of a boat is to measure the height of your boat's mast or highest point from the waterline to the top of the object. This should be done while the boat is in the water and not while it is out of the water, as the measurements may vary. Then, subtract that measurement from the bridge's clearance height, as posted on a bridge marker near the bridge itself. The difference between mast height and the posted clearance height is your boat's bridge clearance.

What is height for clearance of flybridge boat sundale bridge southport?

The clearance for the Sundale Bridge in Southport is 6m (19.68 feet).

How to read bridge high for boat?

To determine the clearance height under a bridge for a boat, you can follow these steps: Obtain the bridge clearance information: Research the specific bridge you want to pass under and find its official clearance height. This information is usually available in boating charts, guidebooks, or online resources. It is important to note that bridge clearance heights can vary depending on factors such as tides and water levels, so you might need to consider these variables as well. Determine your boat's height: Measure the height of your boat from the waterline to the highest point on your vessel. This might include antennas, masts, or other protruding elements that increase the overall height. Make sure to measure accurately and account for any potential changes due to additional weight on board. Adjust for tides and water levels: Considering the current conditions of the water level, calculate if it will affect the boat's vertical clearance. If the tide or water level is significantly higher than usual, it might decrease the bridge clearance. Take the time to research tide tables or contact local marinas for information on water level fluctuations if needed. Compare boat height with bridge clearance: Subtract the height of your boat from the bridge clearance height, taking into account any adjustments for tides or water levels. The resulting figure will indicate the amount of clearance space available. Ensure that there is sufficient clearance for your boat to safely pass through without any obstructions. It is crucial to exercise caution when passing under bridges to prevent collisions or damage to your boat. Always double-check the provided clearance information and plan your routes accordingly. Additionally, check for any potential clearance restrictions due to overhead power lines or other obstructions near the bridge.

How should you pass a fishing boat?

When passing a fishing boat, you should slow down and ensure that you pass at a safe distance. You should also use appropriate signal lights and sound signals to indicate your intentions. Additionally, give the boat's occupants plenty of time to respond before continuing to maneuver your vessel.

How high is a 10ft beam , can it get under a bridge?

No, a 10 ft beam cannot get under a bridge. The typical clearance height for a bridge is between 12 and 15 ft.

How to do field bridge measurements in a sail boat?

Field bridge measurements in a sail boat are typically done to measure and determine the performance of the sailboat in various conditions, such as wind speed, direction and strength. The measurements are generally done using a bridge-like instrument known as a field bridge, which is attached to the boat and measures the forces acting on the vessel in the water. These forces can then be used to calculate the speed, direction, angle of heel and other performance parameters. The measurements can be done while the sailboat is at rest or sailing, depending on the type of field bridge measurement being done.

How high is a 28 ft searay above the waterline?

Typically, a 28 foot SeaRay boat will measure about 8 - 10 feet above the waterline when fully loaded.

Are bridge clearances given for high water?

Yes, bridge clearances are given for high water levels. High water levels can affect the clearance underneath a bridge and must be taken into consideration when calculating bridge clearances.

How to calculate bridge clearance for boat?

To calculate the bridge clearance for a boat, you need to take the height of the bridge, subtract the height of the boat, and then subtract the height of the mast.

How high is a typical sail boat above water?

The height of a typical sail boat above water typically ranges from 3-ft to 15-ft, depending on the boat's design and sail configuration.

Is bridge clearance based on high tides or low tides?

Bridge clearance is usually based on the highest expected tidal range in the area.

How high does a bridge have to be for a boat to pass beneth it?

The height of a bridge for a boat to pass beneath it depends on the size and height of the boat. Generally, a bridge should allow at least 15 feet of clearance for boats traveling underneath it.

How do they measue clearance under a bridge?

Clearance under a bridge is typically measured using basic surveying equipment such as a total station or laser rangefinder. A surveyor will measure from the bridge deck to the ground, or from the bridge deck to any other obstacle that the bridge must clear.

How to increase the clearance in bridge?

Increasing the clearance in a bridge involves various considerations and engineering solutions. Here are some possible steps to increase the clearance: Evaluate the bridge: Determine the current clearance and the required increase in clearance. Assess the bridge's structure, age, and load capacity to ensure that it can accommodate any modifications. Modify the roadway: If possible, lower the road surface by excavation or reducing the pavement thickness within the bridge approach areas. This can create more space for the clearance above. Adjust bridge parapets: Parapets are the protective walls on the sides of the bridge. Modifying or replacing them with lower-profile ones can increase the vertical clearance. Modify the bridge deck: Consider increasing the thickness or replacing the bridge deck with a thinner material, which can help raise the vertical clearance. Redesign or replace the bridge girders: Girders provide the structural support for the bridge deck. If replacement is feasible, consider using girders with a shallower profile to increase the clearance. Modify the bridge abutments: Abutments are the supports at the ends of the bridge. Adjusting or replacing them with shorter ones may allow for a higher clearance. Use specially designed arches or trusses: In some cases, adding arches or trusses under the existing bridge can increase the clearance without significantly altering the structure above. Divert or relocate the roadway: If feasible, consider modifying the roadway alignment to bypass the bridge completely or relocate it to a nearby location with better clearance. Seek professional guidance: Consult with bridge engineers and professionals to assess the bridge's specific conditions, evaluate potential solutions, and ensure compliance with applicable regulations and safety standards. Always keep in mind that altering a bridge's clearance requires professional expertise and adherence to safety regulations and standards.

What does 2.2m height clearance mean?

2.2m height clearance means that the area has a minimum clearance height of 2.2 meters. This could refer to the clearance of a doorway, ceiling, or any other space.

What is the average height of a bridge from the water?

The average height of a bridge from the water is approximately 20 meters (65 feet).

What do you need to know when passing under a river bridge boaters test?

When preparing to pass under a river bridge during a boater's test, there are several important things you need to know, including: Bridge clearance: You must know the clearance height of the bridge to ensure your boat can safely pass under it without hitting any part of the structure. This information is usually posted on a sign or marker near the bridge or in nautical charts. Boat height: Measure the height of your boat from the waterline to the highest point, such as an antenna or mast. Compare this measurement to the bridge clearance to determine if your boat can safely pass through. Antennas and equipment: Take into consideration any antennas, equipment, or other protruding features on your boat that could increase its overall height. Include these items when measuring the boat's height and determining if it can clear the bridge. Tides and water levels: River levels can fluctuate due to tides, rainfall, or other factors. Consider the current water level before attempting to pass under a bridge, as lower water levels may increase the clearance while higher water levels can decrease it. Navigation aids: Look for any buoys or markers that indicate safe passage or channel boundaries around the bridge. These aids can guide you through the correct path and maintain proper clearance. Traffic and speed: If there is significant boat traffic or strong currents near the bridge, adjust your speed and course accordingly. Be aware of other vessels and follow any right-of-way rules to safely navigate the area. Safety precautions: Always maintain a proper lookout and keep a safe distance from other boats. Turn on your navigation lights, use a horn or whistle to signal your approach, and communicate with nearby vessels if necessary. Remember, it is important to follow all rules and regulations set forth by local waterway authorities and the boating licensing agency in your area. Additionally, be mindful of any specific instructions provided during your boater's test regarding passing under bridges.

Can a 10 foot high boat get under the bridge at route 603 bridge boat clearence?

No, 10 feet is too high to fit under the Route 603 bridge boat clearance.

How to determine if your boat will fit under a bridge?

To determine if your boat will fit under a bridge, you need to consider the height of the bridge and the height of your boat. Here are the steps to follow: Measure the height of your boat: Measure the highest point of your boat, usually the highest part of the mast, antenna, or other structures. This measurement will give you the overall height of your boat. Research the bridge height: Find out the height clearance of the bridge you want to pass under. Bridge heights are usually marked on navigational charts or indicated by signs posted on the bridge itself. Compare the measurements: Compare the height of your boat to the clearance height of the bridge. Ensure that the height of your boat is lower than the clearance height of the bridge. It is essential to have some margin to account for factors like tides, waves, or potential errors in measurements. Account for any potential changes: Consider the impact of tides, waves, or other factors that could affect the height of your boat. For example, if the tide is high, it might increase the overall height of your boat and make it impossible to pass under the bridge safely. Seek local knowledge or expert advice: If you are unsure about the height clearance or have concerns about passing under a particular bridge, consult local marinas, boat clubs, or other experienced boaters who are familiar with the area. They can provide you with valuable information and tips about specific bridges. Remember, it is crucial to ensure sufficient clearance before attempting to pass beneath a bridge. Underestimating the height or attempting to squeeze through with little clearance can be extremely dangerous and lead to severe damage to your boat or injuries.

What is boat bridge clear with arch?

Boat bridge clear with arch is a type of bridge designed specifically for small boats. It has an arch-shaped clearance which allows boats to easily pass underneath without having to negotiate any steep incline. This type of bridge is especially useful in areas where there are large bodies of water, but the span of the bridge is too small for a full-size bridge.

How to know bridge height and which boat works?

Bridge height can be determined by contacting the local bridge authority or by measuring the distance from the water's surface to the bridge. The type of boat that works best will depend on the size of the boat, the type of water it is traversing, and the type of bridge.

How to find clearance under bridge in tides problem?

To find the clearance under a bridge in a tidal situation, you need to take into account both the water level at high and low tides. The clearance will be the difference between the highest high water mark and the lowest low water mark. In other words, the clearance under a bridge in a tidal situation is the difference between the highest flood tide level and the lowest ebb tide level.

Can boats go under the 212 bridge in milledgeville?

No, boats cannot go under the 212 bridge in Milledgeville. The bridge is too low to allow boats to pass through.

How to determine if a ship can fit under a bridge?

To determine if a ship can fit under a bridge, the clearance height of the bridge should be measured and compared to the height of the ship. Additionally, factors such as the width of the ship, the width of the bridge, and the curvature of each structure should be considered.

What is the bridge clearance for a super yacht?

The bridge clearance for a Super Yacht depends on its height, as well as the features and capabilities of the specific Super Yacht. Generally, a Super Yacht will require a minimum clearance of around 20 – 25 feet in order to pass under most bridges.

How to find out boat's height?

To determine the height of a boat, you will need to consult the specific boat manufacturer or boat model’s specifications. Each boat manufacturer or boat model will have different measurements for height. You can consult the boat manufacturer’s website, contact the manufacturer directly, or measure the boat yourself with a measuring tape from the highest point of the boat to the water line.

What boat can you buy with heigh clearance of 10 feet?

You can buy a pontoon boat with a height clearance of 10 feet.

What is term for the height of a boat?

The height of a boat is usually referred to as the draft.

How do i find the clearance under bridges?

Depending on the bridge, you can usually contact the Department of Transportation in your area to inquire about the clearance under bridges. Additionally, some states may provide online resources, such as maps or charts, that you can use to find the clearance under bridges in that state.

How to determine bridge clearance on a yacht?

Bridge clearance on a yacht can be determined by measuring the height of the top of the yacht’s mast from the waterline. This measurement will be compared to the height of the bridge from the waterline. The difference between the two measurements is the bridge clearance.

How to come up with bridge clearance for transport of boat?

In order to come up with a bridge clearance for transport of a boat, you will need to research the bridge height where you are planning to transport the boat. Additionally, you will need to consider the size and draft of the boat and any other structures or protrusions (such as a sail or mast) that may need to be taken into account when determining the bridge clearance.

How to come up with bridge clearance on boat bid calculation?

Bridge clearance is calculated by taking the overall length, width and height of the boat and subtracting it from the height clearance of the bridge. The height clearance of the bridge should be known prior to calculating the bridge clearance of the boat.

What is hor clearence boating?

Hor clearance boating is the process of sailing a boat beneath a bridge or other low overpass. It involves careful maneuvering and precise timing to ensure that the boat does not collide with the obstruction.

What kinda boat will fit under bridge clearence of 5 feet?

A boat with a draft (depth below waterline) of less than 5 feet should fit under a bridge clearence of 5 feet.

What is the maximum height of your boat if you pass brayden water at high tide?

The maximum height of your boat will depend on the type and size of your boat, as well as the local tide conditions.

How is a boays bridge clearance figured?

Boyes Bridge clearance is typically figured by calculating the difference between the bridge height and the height of the tallest object (ship, vehicle, etc.) that will be passing through the bridge. This calculation can generally be completed by adding the height of the object to the water level, and then subtracting the bridge height.

How height of the bridge to let the boat pass under?

The height of the bridge will depend upon the size of the boat. It should be high enough to allow the boat to pass under it.

How to measure bridge height of a boat?

To measure the bridge height of a boat, you will need to use a tape measure or a ruler. Start by measuring the distance from the waterline to the top of the bridge. This measurement is the bridge height. Alternatively, you can use a laser rangefinder for a more accurate measurement.

What is the bridge clearance on cobia boats?

Cobia Boats do not release specific information about the bridge clearance on their boats. It would be best to contact their customer service directly for this information.

What does gridge clearance mean on a boat?

Gridge clearance is a term used to describe the vertical distance between the highest point on the deck of a boat and the underside of the bridge or overhanging structure above. This is important in determining if a boat is able to safely pass through a bridge or other overhead obstacles.

How to calculate bridge clearance?

Bridge clearances are determined by the vertical distance between the bridge deck and either the water level or the bridge approaches. In most cases, bridge clearance is calculated by subtracting the bridge deck elevation at the highest point of the arch from the elevation of the lowest point of the arch. In other cases, bridge clearance is determined by taking the difference between the bridge deck elevation at the lowest point of the arch and the water level. In either case, the result gives an estimate of the vertical clearance available for vessels beneath the bridge.

What does bridge clearnce at mean high water mean?

Bridge clearance at mean high water is the vertical distance between the mean high water mark and the underside of the bridge. It is the minimum vertical clearance that a vessel must have in order to safely pass under a bridge at mean high water.

What is the bridge clearance for buccaneer 210 sailboat?

The bridge clearance for the Buccaneer 210 sailboat is approximately 30 feet.

What is a bridge clearance aboard a ship?

Bridge clearance aboard a ship is the vertical distance between the ship's deck and the lowest overhead object, such as a bridge or other structure that the ship may pass under.

What is the minium bridge clearence for an intrepid boat?

The minimum bridge clearance for an Intrepid Boat is 8 feet.

How to calculate boat bridge clearence on trailer?

To calculate the boat bridge clearance on a trailer, you will need to consider the following factors: Boat Height: Measure the height of your boat from the highest point, such as the top of the windshield or any antennas or structures on top of the boat. Trailer Height: Measure the height of your trailer from the ground to the highest point, usually the top of the trailer frame or the fenders. Hitch Height: Measure the height of the hitch point where the trailer connects to your vehicle. This measurement is important to ensure that the trailer is level when attached to the towing vehicle. Ground Clearance: Measure the distance between the ground and the lowest point on the boat or trailer. This is essential to ensure that the trailer does not bottom out on steep inclines or uneven surfaces. Once you have these measurements, you can calculate the boat bridge clearance by subtracting the total height of the boat and trailer (boat height + trailer height + hitch height) from the specified bridge clearance height. The bridge clearance height refers to the minimum distance between the bridge and the road surface. It is crucial to have enough clearance to avoid any damage to your boat or trailer when passing under a bridge. If the calculated clearance is less than the bridge clearance height, it is advisable to find an alternative route or choose a different trailer to transport your boat if possible.

How to.measure the height of outriggers to water line plus bridge?

To measure the height of outriggers to the water line plus bridge, you will need to follow these steps: Gather the necessary tools: You will need a measuring tape or a laser distance measurer, a level, and a pen or marker to record the measurements. Determine the starting point: Find a stable and level surface near the outriggers and water line where you can begin measuring. This could be the dock, a nearby platform, or any solid ground. Measure the distance from the starting point to the water line: Use a measuring tape or a laser distance measurer to measure the vertical distance from the starting point to the water line. Ensure that the measuring tape or laser is level and perpendicular to the water line for accurate measurement. Record the measurement: Once you've obtained the distance from the starting point to the water line, write it down or make a note of it. Measure the distance from the water line to the bridge: Move your measuring tape or laser distance measurer to the location where the bridge is situated. Again, ensure that the measurement is level and perpendicular to the bridge. Determine the height of the outriggers: Subtract the distance from the water line to the bridge (step 5 measurement) from the distance from the starting point to the water line (step 3 measurement). This will give you the height of the outriggers from the water line to the bridge. Note down the measurement: Write down or make a note of the calculated height of the outriggers. By following these steps, you should be able to accurately measure the height of the outriggers to the water line plus the bridge.

What is Pine Island bridge save clearance for boats?

The Pine Island Bridge has a vertical clearance of 25 feet at mean high water.

Is a boats bridge clearance in the water or on the trailer?

It depends on the type of boat and trailer. Boats typically have clearance in the water, since they are designed to float freely on the surface. Some boats are designed to partially submerge when being towed, while others may require a tall trailer to ensure enough clearance over the road.

How to measure Max Bridge Clearance on a boat?

The best way to measure the maximum bridge clearance on a boat is to use a measuring tape or a laser distance measurer. Start at the top of the highest point of the boat's superstructure, and measure straight up to the boat's highest point. This will give you the maximum bridge clearance of your boat.

What does maximum bridge clearance mean for boats?

Maximum bridge clearance is the maximum height of an object (usually a boat) that is allowed to pass through or under a bridge or other type of overhead structure. This is generally determined by the height of the bridge and the draft of the boat, which is the vertical distance between the waterline and the lowest part of the boat's hull. If a boat's height is greater than the bridge clearance, it must take an alternate route.

Where is a boats bridge clearance measured from?

A boat's bridge clearance is typically measured from the waterline to the highest point on the vessel.

What is bridge clearance on a boat?

Bridge clearance on a boat is the vertical distance from the waterline to the highest point of the boat, usually the top of the mast or arch. This is important to know as it can determine which waterways a boat can safely navigate.

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On the Aral Sea, graves rise above the dust. They’re reminders of the life its waters once sustained

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In the middle of the vast desert that surrounds what is left of the Aral Sea , graves stand as stark reminders — of communities that once thrived, of the powerful body of water that teemed with life, and of the years of change that fueled its disappearance .

Decades ago, when the Aral was among the world’s largest inland bodies of water, it was an economic and social force for the region. Today, climate change — paired with engineering and agricultural projects — has left behind largely wasteland, with only pockets of water where few animals, plants or people can live.

But scattered throughout the sandy, rocky shores are the graves — in small clusters, rising above the dust.

Some graves are surrounded by stonework; others have basic metal fencing. Crevices and bricks hold flowers in place, brought by loved ones and others who remember brighter days.

Weathered, rusted headstones with photos and descriptions commemorate the lives of those who lived and worked here.

Some are built in the shape of lighthouses or anchors — a reference to the sea that sustained them.

EDITORS’ NOTE: This is the third piece in an AP series on the once-massive Aral Sea, the lives of those who’ve lived and worked on its shores, and the effects of climate change and restoration efforts in the region. The AP visited both sides of the Aral, in Uzbekistan and Kazakhstan, to document the changing landscape.

Associated Press climate and environmental coverage receives support from several private foundations. See more about AP’s climate initiative here . The AP is solely responsible for all content.

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Congressional leaders sell $1.2 trillion spending package to members before shutdown deadline

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$6,500 school vouchers coming to Georgia as bill gets final passage and heads to governor

Georgia senators are giving final approval to $6,500 vouchers funding for private school tuition and home schooling, sending the measure to Gov. Brian Kemp for his signature

Alabama lawmakers advance expansion of ‘Don’t Say Gay’ law

Alabama lawmakers have advanced legislation that would prohibit teacher-led discussions on sexual orientation and gender identity in public schools and also ban Pride flags from being displayed in classrooms

FBI: ‘Little rascals’ trio, ages 11, 12 and 16, arrested for robbing a Houston bank

Three boys, ages 11, 12 and 16, and dubbed the “Little Rascals,” have been arrested for robbing a bank in Houston

Police ID man who died after driving backward off boat ramp into Concord Pond near Seaford

Delaware State Police have identified the Baltimore man who died Monday after his truck sank into Concord Pond near Seaford as 72-year-old David Schoeberlein.

Police said Schoeberlein lost control of his truck while backing down the boat ramp and ended up submerged in the water inside the vehicle. Officers are still investigating what led to the car driving off the ramp.

MORE: Man dies after driving backward off boat ramp into Concord Pond; police investigating

Send story tips or ideas to Hannah Edelman at [email protected]. For more reporting, follow them on X at  @h_edelman.

Fatal boat crash launched woman into trees and threw man into water, Florida cops say

A body pulled from trees was among two discovered after a 21-foot boat crashed near southwest Florida’s Little Hickory Bay, according to investigators.

It happened around 3 p.m. Friday, March 15, not far from North Naples, about a 160-mile drive south from Tampa, the Florida Fish and Wildlife Conservation Commission said in a news release.

“The vessel, carrying two occupants, was traveling north, passing red channel marker 14, when it’s starboard side ran into the mangrove trees, ejecting both passengers,” FWC officials said.

“The unmanned vessel remained in gear until it crashed into the mangrove shoreline, coming to a stop.”

Judy Eaton, 71, of Bonita Springs “was recovered from the mangrove trees where she was pronounced deceased,” officials said.

John Moulder, 71, of Naples, was airlifted by EMS to Gulf Coast Medical Center in Ft. Myers, “where he later died from his injuries,” officials said.

The cause of the crash remains under investigation, but alcohol may have been a factor, investigators said in the report.

Boaters who use the area regularly told WBBH the couple died at a turn known to be dangerous, but signs marking the hazard vanished during Hurricane Ian , which struck southwest Florida in September 2022.

“Sadly, I was not surprised,” boater Kevin Price told the station. “I had a conversation with another friend recently about this turn specifically, and some of the close calls I’ve seen at this spot.”

Mysterious traveling buoy in Florida river raises concerns. What is it attached to?

Two girls found drifting alone in boat after adults vanished in Florida lake, cops say

Boat crashes into Florida bridge, leaving 10 people struggling in river, rescuers say

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Public health officials say consumers should avoid water from Easton-based company

by NBC 10 NEWS

The Massachusetts Department of Public Health said Wednesday that consumers should not drink any water from Simpson Spring in Easton.

"Consumers are urged not to consume any Simpson Spring products until further notice," the department said in a release.

Public health officials said the water tested for PFAS above drinking water standards. PFAS are per- and polyfluoroalkyl substances, also called "forever chemicals."

The DPH said people should not drink Simpson Spring bottled water or fill water containers at the company's self-service vending machines.

"On March 1, Simpson Spring advised DPH that it would voluntarily cease bottling operations temporarily and disconnect its vending machines until the issue is resolved," the state's release said.

The department said consumers should pour Simpson Spring water down the drain and recycle any plastic containers.

DPH said its Food Protection Program collected samples from Simpson Spring in Easton on Feb. 21 and again on March 11 that confirmed the high levels of PFAS.

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The state said it is working with Simpson Spring to resolve the problem, and the company said it is cooperating.

"We are committed to providing the highest quality spring water from one natural source. We will continue to provide full transparency to our customers," Simpson Spring Company said in a Facebook post.

Simpson Spring said it was offering water from Berkshire Springs as an alternative.

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Mast height above water

• Thread starter Thedroubies
• Start date Aug 16, 2019
• Hunter Owner Forums
• Ask A Hunter Owner

Thedroubies

Need to know mast height above water for 2008 31ft. Hunter...  

Will Gilmore

Welcome to SBO, Thedroubies. You have come to the right place for all things sailing. You obviously have a great sense of good sailing to make this decision for answers to your questions. Others who know a lot more than I will be along to help. In the mean time, I would suggest two immediate solutions. One, as a former Maths teacher and design engineer, trigonometry . The other, run a 50' tape measure up your halyard and add the distance from water plus a foot for the mast head and weather vane to the measurement. That should get you pretty darn close. It is great to welcome you aboard and good luck and good weather. -Will (Dragonfly)  

Hello Below

This link shows 46’ 7”. https://www.marlow-hunter.com/wp-content/uploads/2014/07/33_2004_2012.pdf  

Did Hunter make a 31 in 2008? I thought it was between '83 and '87. Anyway, the 31 had a mast height of 47' above DWL.  

Hello Below said: This link shows 46’ 7”. https://www.marlow-hunter.com/wp-content/uploads/2014/07/33_2004_2012.pdf Click to expand

SailboatData.com - HUNTER 31 Sailboat

rgranger said: This link is for an H33. The OP said he had an H31. @Brian D 's question might be the key here. Click to expand

Previous Models | Marlow-Hunter, LLC

SailboatData.com - HUNTER 31-2 Sailboat

Hunter 31-2 - Wikipedia

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2 river flood warnings in effect for Brantley and Glynn Counties

St. john’s river water management district schedules controlled burn at conservation area.

Joseph Wolfe , News4JAX Intern

PALATKA, Fla. – According to a release, the St. John’s River Water Management District conducted a 196-acre prescribed burn at its J.P. Hall Bayard Conservation Area in Clay County .

The purpose of the burn is to reduce hazardous fuel loads, i.e. excess vegetation or dry wood, and maintain fire-dependent commodities.

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According to officials, a prescribed fire refers to a controlled burn used for managing tree diseases, reducing chances of spontaneous wildfire, and cycling nutrients, among other environmentally beneficial reasons.

Officials described the possibility of smoke and ash during the burning as a temporary nuisance. According to a release, prescribed fires are generally scheduled according to weather and wind conditions to reduce the impact of smoke and ash.

The burn will be located on the south side of Bayard Road, and during the burn, portions of the White Trail will be closed.

For more information, visit the District online at www.sjrwmd.com/land/management/prescribedfire

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Southwest Colorado snowpack in good shape as spring begins in New Mexico, new storm arrives

Worries about runoff season ease after recent series of storms.

It took nearly all winter to get there, but the snow-water equivalent in the snowpack of the mountains of southwest Colorado now registers as above normal for the first time this season.

A series of storms that blew through the Four Corners area over St. Patrick’s Day weekend was responsible for that final push after the snowpack had hovered at normal or near normal for the better part of the last month. Most of San Juan County, and many other locations in the region, saw significant rain or snow for three straight days beginning Friday, March 15 and continuing through Sunday, March 17.

According to the Colorado SNOTEL map maintained by the U.S. Department of Agriculture’s Natural Resources Conservation Service, the San Miguel-Dolores-Animas-San Juan rivers basin in southwest Colorado was showing a snow-water equivalent of 103% of normal on March 17.

A week earlier, that figure had been at 90%. But the region appeared poised to welcome the first day of spring this week with a slight cushion in its snowpack, relieving worries about the quantity of this year’s runoff, at least for now.

San Juan county gets 'generous helping' of rain

“This was an interesting event,” said Bladen Breitreiter, a meteorologist with the National Weather Service office in Albuquerque, noting that the relatively warm temperatures meant most of that moisture fell as rain in San Juan County, although there was plenty of snow in the higher elevations west, north and east of the county.

“You had a lot of mix going on,” he said. “But it was a pretty generous helping.”

More: Indicators point to 'normal' wildfire season in San Juan County—for now

While precipitation totals varied widely across the county, the Four Corners Regional Airport — the official reporting site for Farmington — fared well. It registered 0.34 inches of rain Friday, 0.25 inches on Saturday and 0.28 on Sunday. That represented a total of 0.87 inches for the weekend.

That brought the year-to-date total at the airport to 1.67 inches, just shy of the 1.75 inches the airport normally sees by March 18.

Breitreiter noted that on March 12, the airport had seen only 0.89 inches for the year. So, the last week went a long way toward erasing what had been a significant dry spell.

Breitreiter pointed to other parts of the county that shared the precipitation wealth:

• Navajo Dam saw 0.75 inches of moisture on Sunday.
• The Aztec area saw 0.28 inches of rain on Friday, 0.39 inches on Saturday and another quarter-inch on Sunday.
• Toadlena in western San Juan County near the Chuska Mountains saw a significant amount of snowfall.

Rio Grande River, Colorado River basins' water picture

Last weekend’s storms also left a good deal of snow across Colorado, meaning the snow-water equivalent in each of that state’s eight river basins is now above normal for the first time this year — including the upper Rio Grande River basin, which was at 101% on March 17 after registering at well below normal for much of the winter.

The news was even better for the headwaters of the Colorado River, as that basin was at 107% of normal on March 17 – a welcome development for the seven western states, including New Mexico, that are members of the Colorado River Compact, the agreement that governs water use for much of the Southwest.

While clear skies and higher temperatures had returned to San Juan County by Monday, March 18, Breitreiter said the Four Corners could be in line for additional moisture in the days ahead.

“That active (weather) pattern is definitely going to continue,” he said, explaining another storm system is due to move into the area this weekend. “By Saturday night, you could have another big one on the docket.”

Mike Easterling can be reached at 505-564-4610 or [email protected] . Support local journalism with a digital subscription:  http://bit.ly/2I6TU0e .  

Environment | Colorado mountain snowpack: “We’re sitting…

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Environment | Colorado mountain snowpack: “We’re sitting pretty right now”

Heavy snow in march brought snowpack in river basins statewide above norm.

Colorado’s mountain snowpack measured 109% of the 30-year norm on Monday after lagging earlier this winter, setting up potentially healthy water supplies.

March snowstorms bolstered the snowpack, which typically peaks in mid-April before melting intensifies.

“We’re sitting pretty right now,” National Weather Service meteorologist Caitlyn Mensch said. “We’re above 100% everywhere, which is positive to see as we head into spring.”

The snow in Colorado’s mountain river basins melts gradually, depending on temperatures, trickling into creeks and rivers that flow into water storage reservoirs. On Jan. 5, the overall snowpack in western Colorado hovered around 70% of the norm after months of relatively dry conditions, according to the U.S. Department of Agriculture’s snow survey data.

On Monday, those federal measurements of “snow water equivalent” — the amount of water held in the snow — showed snowpack at 108% of the norm in the closely-watched Upper Colorado River Basin, a crucial source for 40 million people in seven states and the nation’s agriculture.

The snowpack in the South Platte River Basin, which supplies metro Denver and the farms and ranches across northeastern Colorado, has reached 114% of the norm, data shows. Before last week’s heavy snow along the Front Range, that basin was at 96% of the norm.

In the Arkansas River Basin that supplies farms on the southeastern Colorado plains, the snowpack measured 111%.

“The recent storm was especially big for areas east of the Continental Divide. The Arkansas basin in southern Colorado went from well below to well above average just from this single storm,” state climatologist Russ Schumacher said from the Colorado Climate Center at Colorado State University.

“Getting big upslope storms in the spring is consistent with the ongoing El Niño,” Schumacher said, referring to the Pacific Ocean patterns that influence weather. “El Niño years often have near average to below-average snowfall through the heart of winter but then things pick up in March and April.”

The Upper Rio Grande River in southern Colorado had a snow-water equivalent of 101%, data shows. Southwestern Colorado mountains had a combined snow-water level of 103% of the norm in the San Miguel, Dolores, Animas, and San Juan river basins. The Gunnison River Basin was at 103%; the Yampa and White river basins at 113%; and the Laramie and North Platte basin at 106%.

Much of the land in southwestern Colorado remained dry, U.S. Drought Monitor data shows. Parts of Saguache, Alamosa, Costilla, and Conejos counties in the San Luis Valley were classified as in severe drought.

National Weather Service forecasters on Monday were anticipating more snow on Sunday.

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The owner of a $3.4 million Lamborghini yacht screamed 'I will kill you' and threw $100 bills into the water when told he couldn't use a private dock

• The owner of a Lamborghini yacht threatened a private dock employee, per CBS8.
• The employee said Ajay Thakore mooned and threw cash at him after being told he couldn't use the dock.
• Thakore, the CEO of Doctor Multimedia, issued an apology through his public relations team.

The owner of a $3.4 million Lamborghini yacht threatened a private dock employee after being told he couldn't be there, the San Diego-based broadcaster CBS8 reported on March 11.

Joseph Holt, a 21-year-old employee at Marriot Marina in San Diego, told CBS8 that he spotted the yacht sailing into the private dock. The owner, whom CBS8 identified as Ajay Thakore, tried to pick another person up at the dock, Holt said.

"I told him respectfully that he couldn't be there, and I honestly was hoping to have a conversation with him about his cool boat," Holt told CBS8.

In a YouTube video posted by @SM-wc9eq on March 10, a dark blue Tecnomar for Lamborghini 63 is seen sailing out of a dock. A man in a gray T-shirt, a pair of jeans, and a cap was shown standing on the yacht. The man appeared to be Thakore, per CBS8.

Thakore was shown shouting at Holt. "I will kill you, you know I will kill you!" he can be heard saying multiple times in the video

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Thakore was later shown pounding his fist on his palm and pointing his thumb down before telling Holt: "To your face!" Holt was shown responding by pointing his middle finger at Thakore.

"I really was trying to restrain myself from getting fired from my job or stepping out of line. The only thing I did was give him the bird," Holt told CBS8.

Holt said Thakore then took $100 bills from his wallet and threw them at him. He added that Thakore mooned him. This exchange was not shown in the video.

"He was saying I'm nobody, I'm nothing, I work a silly job. He said that he knows people, he has connections, he can change my life and ruin it," Holt said. Holt did not immediately respond to Business Insider's request for comment.

The San Diego Harbor Police arrived at the marina 10 minutes after Thakore's yacht exited the dock, per CBS8. The Harbor Police did not immediately respond to a request for comment from BI.

According to Thakore's LinkedIn page , he's the CEO of Doctor Multimedia. The company's website shows that it's a healthcare marketing firm based in San Diego. Thakore appears to go by the name Ace Rogers on Instagram and TikTok, where he's noted as being a professional gambler.

Thakore, through his public relations team, told CBS8 in a statement that his altercation with Holt was "regrettable."

"What started as a minor misunderstanding escalated into an argument, and I apologize for my actions and to those who witnessed the unfortunate exchange," the statement said. Thakore did not immediately respond to a request for comment from BI.

Thakore isn't the only CEO who's been called out for threatening another person. In November 2021, an Activision spokesperson told BI that its ex-CEO Bobby Kotick had previously apologized for telling his assistant he would have her killed. The spokesperson added that Kotick's threat was "obviously hyperbolic and inappropriate" and that "he deeply regrets the exaggeration and tone."

In June 2020, Lisa Alexander, the CEO of LaFace Skincare, a cosmetics company, apologized in a statement to the media after she had threatened to call the police on her neighbor for writing "Black Lives Matter" on his property. Alexander said in the apology that she was "disrespectful" and "should have minded my own business."

Watch: The scariest things OceanGate's CEO said about deep-sea diving

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