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New 135m Axe Bow High Performance Mega Yacht Concept by T. Fotiadis

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Written by Zuzana Bednarova

The revolutionary new 135-metre High Performance Axe Bow Yacht Concept has been proudly unveiled by T. Fotiadis . The first project out of the series, the striking 135m Fotiadis High Performance Mega Yacht Concept represents the evolution of a design study, introduced by Fotiadis back in 2012.

New 135m Axe Bow High Perfomance Mega Yacht Concept by T. Fotiadis

The 135m Fotiadis High Performance superyacht concept is conceived to create a steer in and out of the water. Both magnificent and seaworthy; all while utilizing energy and eco-friendly ideologies for this one of the first in a line of sustainable and superior vessels. The Hull is designed to achieve top speeds estimated at 40-45 knots.

On one hand speed and sportive appearance, on the other hand luxurious owner’s and guest are quarters with well protected outdoor areas. The unique exterior styling completes an unrivaled yacht design form.

With upwards of 23,500 horsepower on tap, the 135m Fotiadis High Performance luxury yacht concept can reach speeds up to 45 knots with four extremely powerful MTU engines coupled to two steerable Rolls Royce water jets and two gas turbines also coupled to two further Rolls Royce water jet boosters. At the maximum speed of 45 knots the 135-meter Axe Bow beast can leap from Monaco to Mykonos within only one single day.

135m Fotiadis Axe Bow High Perfomance Superyacht Concept

The internal layout is based on an efficient usage of space. Top sides hug the superstructure in a seamless way while lines and curves stretch from bow towards aft. While the voronoi pattern ensures a rigid hull, it creates alfresco areas also on the lower decks. The Owner’s 320 sq. completes the private deck at level four, consisting of a large state room facing the aft.  Privacy is given a priority, thus owners premises are not accessible by guests, At the same deck to the aft we have the Helipad for timely arrival or departure for the owner, while utilizing neighboring space for use as an exterior lounge area comprised of a Jacuzzi, alfresco salon and open air cinema. Guest suites are located on the third decks as well as on the beach club. An office with a reception and waiting area are located close to the main staircase.

The entire Upper Deck, level five, offers common and entertaining areas for the Owner and his Guests with a spacious lounge having access to the forward deck where a Jacuzzi have been placed as well as a flip out 180 inches flip out LED screen.

135m Fotiadis Axe Bow High Perfomance Motor Yacht Concept

Alfresco dining on the third deck and there is also to be found a library.

10 comfortable Guest cabins accommodating 16 Guests are well located together one deck below on Main deck and 4 guests on the port and starboard side on the beach club level. The tender garages are located on the bow and aft with side gull wing doors and can accommodate a personal submarine, recreational expandable island and a 8m (26 ft.) tender as well as various water toys. A gym with access to the beach club, which is providing supreme privacy and offers protection from the elements while sunbathing.

Technical Specifications of the 135m Fotiadis High Performance Yacht Concept

Length: 135.0m (442 ft.)

Max Beam: 20.1m (66 ft)

Draft: 4.3m (14.1 ft)

Max. Speed: + 45.0 kn

Cruising speed: 22.0 kn

Range: 1050nm @ 45 kn

Range: 3,500nm @ 21 kn

Fresh water: 90t

Propulsion (main): 4x 5875 PS MTU diesels coupled to steer able Rolls Royce water jets.

Propulsion (aux): 2x 32000 PS Gas Turbines coupled to Rolls Royce water jets.

Generator: 2 x 870 kW diesel

Maneuvering: 1x 500 kW bow thruster

Passengers: Owner: 2

Please contact CharterWorld - the luxury yacht charter specialist - for more on superyacht news item "New 135m Axe Bow High Performance Mega Yacht Concept by T. Fotiadis".

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How to make a better yacht bow

When asked most seafarers say that a bow’s job is to enable a vessel to pierce through waves, slides over waves, keep water off the foredeck, or even that it’s just a place to put the anchor and chain. But few realise that the bow shapes the waves that flow alongside the vessel. A badly designed bow will create unnecessary drag; while a good one will cut resistance and increase comfort.

Half-angle of entry

In most cases, the criteria for the design of the bow begins with the half-angle of entry. This is the naval architect’s term for the more commonly known ‘horizontal bow angle at the waterline’.

A yacht with a large half-angle of entry will slam into, or at least fight, waves often throwing a lot of spray and green water ahead of it. A vessel with a fine entry and narrow half-angle will slide right through a wave with little resistance.

As a yacht’s half-angle of entry increases, the bow becomes more prone to slamming into waves, which in turn, requires more power to keep the yacht moving steadily into the sea and tends to increase pitching.

The angle of entry at the bow is defined by the yacht’s speed and function. In a sailing yacht, the half-angle might be between 10 and 20 degrees, with 10 degrees being a fine entry and 20 degrees being more suited for a slower displacement yacht.

On a motor yacht a fine angle of entry, say 12 degrees, is suited to high-speed semi-displacement style yachts, whereas a normal half-angle is between 18 to 24 degrees.

A very fine half-angle – less than 10 degrees – is to be avoided. It makes the bow narrow and reduces the forward volume of the hull forcing lockers, gear and equipment aft. That said, a long, narrow vessel will have a finer angle of entry than a short, wide vessel, so a specific half-angle of entry should only be used as a comparison factor on vessels of similar length and beam.

The widest half-angles of entry – from 30 degrees to more than 40 degrees – are rarely found on yachts, but can be seen on scow-type barges that move at very slow speeds and throw a lot of water ahead of the bow. These cargo carrying vessels don’t have passengers and move slowly, so wave impacts and slamming can be accepted.

However, if the wave is very large and the yacht has a narrow half-angle, the wave might simply rise up and wash across the deck. To eliminate this designers often flare the upper bow so the rising wave crest is turned back into the ocean.

The most extreme example is what has become known as the ‘Carolina flare’ on convertible sportfishermen built on the Outer Banks

Types of bows

Designed originally to combat the waves off the Carolina inlets, the so-called Carolina flared bow is often attributed to sportfishing boats built by Buddy Davis and the others of The Outer Banks. The idea is that a fine angle of entry drives into the waves, but as wave size increases the flare rises up over them, throwing the water back into the ocean without getting the deck wet.

Typically, a flared bow will often have a chine or two low on the profile to 'break' the flow of water up the sides of the flare and help direct water away from the bow. In terms of propulsion, the gradual increase in buoyancy from a flared bow ensures that a wave does not impact the bow with a hard crash, but is gently turned aside while the bow lifts to the wave.

This type of bow usually has a chine or lifting strakes carried well forward which also helps throw water to one side and provides additional buoyancy as the bow dives into a wave. The force of the bounce increases with depth and flare angle.

The biggest drawback of this type of the Carolina Flared bow is that, as the yacht slams into a wave, the gradual immersion of the flare causes the bow to pitch upward (vertical acceleration), making the entire yacht pitch, plus the vessel slows down as it pitches requiring more power (read higher fuel consumption) as it drives ahead.

Another drawback is that should the bow submerge, it acts like a giant scoop to dig into the water and throw it across the deck. For this reason, some builders incorporate considerable camber to the foredeck.

When designing such a bow, the designer needs to have a pretty good idea of the height of the waves the vessel is likely to encounter.

Bulbous bows

Bulbous bows are generally only found on displacement hulled yachts – that is, yachts that will not exceed about 1.5 x √LWL, or the Froude number for that hull. Marlow yachts, which are semi-displacement, have an option for a small, delta-shaped bulb that is flat on top and V-shaped below to both break the water and offer some resistance to pitching when performing above displacement speeds. (Bulbous bows work best when the yacht is moving at .9 to 1.2 x √LWL.)

The idea of the bulbous bow is that the wave generated by the bulb reduces the size of the bow wave and hence lowers the resistance of the entire hull. The size of the bulb is most often determined by tank testing when the shape of the bow wave and the bulb’s cancelling effect can be clearly demonstrated, but in general terms, the larger the bulb is, the greater the reduction in resistance as long as the yacht is moving in a relatively flat sea. When the vessel is pitching, the bulb can actually increase hull resistance.

However, a designer needs to be aware of the interplay between the size of the bulb and the anchor handling gear. It would not do to bounce the anchor off the bulb every time the yacht is anchored.

Japanese researchers have found that a bulbous bow along with a slight reduction in the hull waterline beam just aft of the bow, will reduce hull resistance even farther, but at the cost of a reduction in cargo carrying ability and more complexity in the vessel’s construction.

Types of bows (continued)

The opposite of the flared bow is the Axe bow, such as the scimitar bow on the Amel 199. Here where instead of increasing the flare above the water, a very narrow half-angle of entry is maintained from hull bottom to the deck, but extra buoyancy is built in below the waterline with a deeper forefoot, and the sheerline forward is raised against green water on deck.

This type of hull has with lower resistance and creates less pitching in a seaway than a flared bow. Although this shape of bow cleaves waves, it is wet in a seaway.

Experiments in The Netherlands have shown that instead of increasing buoyancy by flaring the bow above the water surface, axe bows increases buoyancy by bringing the underwater bow profile downwards and raising the sheer at the bow.

Not only do these features lengthen the vessel considerably, but they also make it easier to drive into head seas, requiring less power. In addition, it has been suggested that up to 20 per cent lower fuel consumption in head seas can be achieved because the bow does not have the vertical accelerations of a flared bow.

A relatively new trend for larger craft is the scow bow. It has been a fixture on Great Lakes A and C class sailing scows for many years, but its potential was suddenly realised when a Mini-Transat boat with a scow bow handily won the race. Now, designers Reichel-Pugh have designed a 27.4m sailing yacht with a scow bow.

This type of bow carries beam well forward with the intent that the waterline length is increased as the boat heels. The major drawback of scow bows is they slam when upright and on a large yacht, that might be more than the owner is willing to accept.

Wave piercers

The totally opposite look to the Apple Cheek bow is the Wave Piercing bow as used by Craig Loomes Design of New Zealand and others on several superyacht and fast ferry designs.

The idea behind this bow is that the extended sponsons on each side of the catamaran or trimaran hull pierce the waves to reduce pitching in heavy seas. In this style of yacht, the main hulls have less buoyancy forward to allow it to slide through the wave rather than slam into it. By sliding through the waves, less engine power is required and the pitching of the yacht is lower.

The bow is an essential feature of any modern yacht. Elongated bows such as the wave-piercing bow, reverse or axe bow lengthen the waterline and make the angle of entry finer, decreasing the hull resistance of faster vessels and reducing pitching in a seaway. However, the longer waterline can make it harder for the vessel to turn. Meanwhile, bulbous bows decrease the size of the bow wave and consequently reduce hull resistance for vessels that operate at a set displacement speed and load.

A designer should pick the bow shape that is best suited for the desired speed, shape and pitching characteristics in a seaway.

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Bow of a Boat: Essential Guide to Understanding Its Importance

The bow of a boat refers to the forward part of a vessel's hull, playing a critical role in its overall design and function. As the point that is typically most forward when a boat is in motion, the bow has evolved over time to meet the specific needs of various boat types and navigational requirements. Understanding the anatomy, types, and importance of the bow in boat construction can help boat enthusiasts and professionals alike appreciate the essential role it plays in naval architecture and the boating experience.

Different types of bows are designed to accommodate the unique needs of various boats, ranging from sailing vessels and powerboats to larger ships. The shape and design of a boat's bow can significantly impact its functionality, including its maneuverability, stability, and hydrodynamics. With a rich history in nautical culture, the bow remains a key design element that influences both the performance and aesthetics of boats today.

Key Takeaways

• The bow is the forward part of a boat's hull, impacting its design and functionality.
• Various types of bows serve different purposes depending on a boat's specific navigational needs.
• The shape of a bow influences the overall performance, maneuverability, and the experience of boat navigation.

Understanding Boat Terminology

When it comes to boating, it's essential to understand the basic terminology related to boat parts and directions. Navigating a vessel, whether it's a large ship or a small recreational boat, requires knowledge of these terms to communicate effectively and ensure safety out on the water.

The front of a boat is called the bow , while the back is referred to as the stern . The left side of the boat is the port side, and the right side is the starboard side. These terms are used to identify the sides of the boat relative to the direction in which the boat is facing, regardless of one's position on the vessel.

A boat's hull is the main body structure designed to provide buoyancy and displacement needed to support the vessel's overall weight. Key components of the hull include the chine , which is the line where the hull's side and bottom meet, and the stem , the forward-most part of the hull. Other important hull aspects include the draft , the distance between the waterline and the bottom of the hull, and the waterline length , which defines the vessel's length at the water's surface.

The beam of a boat is the width of the vessel at its widest point. This measurement is crucial for stability and overall performance. The rake refers to the angle of the boat's stern or bow in relation to the waterline, affecting factors like speed and fuel efficiency.

Components above the waterline, such as the rail and the prow , help to enhance the vessel's aesthetics and practical attributes. The rail is the protective barrier surrounding the boat's deck, while the prow is the uppermost point of the bow.

Freeboard is the measurement of a boat's hull from the waterline to the upper deck. This dimension is vital when considering a vessel's stability, buoyancy, and safety, especially in rough waters.

In summary, understanding boat terminology is crucial for navigating and operating a vessel effectively. Familiarizing oneself with essential terms like bow, stern, port, starboard, hull, chine, rail, freeboard, and draft will enable better communication and safer experiences on the water.

Bow Anatomy and Types

Bow design and its variations.

The bow of a boat plays an essential role in its performance on the water. There are several types of bow designs that have evolved over time to improve a boat's resistance to drag, speed, and overall stability. Some of the most common bow types include the plumb bow , raked bow , spoon bow , and bulbous bow .

• Plumb bow : This traditional bow design features a vertical front face, which helps in reducing resistance when cutting through the water.
• Raked bow : Characterized by a forward-leaning angle, the raked bow reduces excess water flow over the deck and provides a smoother ride in rough conditions.
• Spoon bow : With a more rounded shape, a spoon bow offers lower resistance and improved comfort, making it ideal for yachts and recreational boats.
• Bulbous bow : This contemporary design, which includes an underwater bulb at the front, minimizes wave-making resistance and enhances fuel efficiency for larger vessels, like cargo ships and cruise liners.

Special Bows

In addition to the common bow types, there are also specialized designs that cater to specific performance requirements. Some of these notable bows are:

• Inverted bow : Also known as a wave-piercing bow , this design reduces pitching and slamming in rough seas, providing a more comfortable experience for passengers.
• Axe bow : With its straight or slightly curved stem, the axe bow minimizes resistance, allowing the craft to achieve higher speeds.
• Parabolic and cylindrical bows : These designs, although less common, can offer unique hydrodynamic characteristics that help in reducing drag and improving performance.

Historic and Modern Bows

The evolution of boat bows has its roots in both historic and modern designs. Techniques used in creating bows have continually been refined over time to ensure optimal performance. Historic bows, like the clipper bow , were known for their speed and ability to slice through the waves. In contrast, modern bows focus on improving the vessel's efficiency and comfort levels.

• Clipper bow : Popularized in the 19th century and used in sailing ships, the clipper bow is known for its narrow v-shaped entry and raked, graceful lines.
• Delta, normal, and reverse bows : These diverse bow forms offer various performance advantages, depending on their application and use in different types of watercraft.

As advances in technology, materials, and design continue, the development of new bow types will continue to enhance the performance and capabilities of boats and ships alike.

Bow and the Boat's Functionality

Impact on stability and speed.

The bow of a boat plays a crucial role in its functionality, particularly in terms of stability and speed. It is the forward part of a boat's hull, designed to effectively enable the boat to pass through the water, reducing resistance components such as wave making resistance and wave breaking resistance . By intersecting the water efficiently, the bow significantly contributes to a boat's overall performance.

The shape of the bow also has a direct impact on the speed of the boat. Boats with a well-designed bow can achieve a higher hull speed , which is the maximum speed a boat can travel without generating excessive waves. Additionally, certain bow types can generate lift, helping the boat plane and further enhancing its speed and fuel economy.

Bow's Effect on Floating and Sailing

A boat's bow has a significant impact on its ability to float and sail effectively. The bow's design determines the way it interacts with oncoming waves, helping to maintain a boat's stability, especially by reducing its pitching motion. A carefully crafted bow can minimize the boat's resistance to waves, resulting in smoother sailing and increased fuel economy .

On the other hand, a poorly designed bow can negatively affect the boat's ability to float and sail properly. In some cases, the bow may generate excessive wave resistance, making it difficult for the boat to maintain its course and speed. Ultimately, the efficiency of a boat's bow is crucial to both the vessel's overall performance and the comfort of its passengers.

To summarize, the bow of a boat plays a significant role in the vessel's functionality, particularly in terms of stability, speed, and sailing proficiency. A well-designed bow can improve a boat's performance while ensuring a smooth and comfortable experience for its passengers.

The Bow's Role in Boat Construction

The bow plays a crucial role in the functionality and performance of a boat. As the forward part of the vessel's hull, it interacts with incoming waves and helps reduce resistance, ensuring efficient movement through the water. The design and construction of the bow are thus significant aspects of boat construction.

Bow Material Choices

When it comes to selecting materials for the construction of a bow, builders have several options, each with its own unique properties and advantages. Some common materials include:

• Steel : Known for its strength and durability, steel is often used in the construction of larger vessels and commercial ships. It can withstand harsh marine environments and offers robust support for bows that face demanding conditions.
• Fiberglass : Ideal for recreational boats and smaller vessels, fiberglass is lightweight, water-resistant, and relatively easy to maintain. It lends itself well to the construction of smooth, streamlined bows that minimize resistance while moving through the water.

Bow Construction Techniques

Several bow construction techniques exist, and the choice of one depends on the type, size, and intended use of the boat. Some common bow designs include:

• Bulbous bows : Featuring a bulb-shaped protrusion at the waterline, these bows are designed to improve hydrodynamic performance, minimize resistance, and increase fuel efficiency. They can be seen on larger vessels like container ships and cruise liners.
• Axe bows : Characterized by a sharp and vertical bow design, axe bows aim to reduce drag and improve the boat's stability in rough sea conditions. They are commonly used in naval and offshore patrol vessels.
• Parabolic bows : These bows have a curved profile that offers reduced wave resistance and promotes smoother movement through the water. They are often seen on high-performance powerboats and sailing yachts.
• Cylindrical bows : Designed with a cylindrical shape for a robust hydrodynamic performance, this type of bow provides improved buoyancy and reduced pitching motions. It is commonly found in offshore vessels and workboats.
• Flared bows : Featuring an outward flare above the waterline, flared bows help direct spray away from the boat and improve its handling characteristics. They are commonly seen on sport fishing boats and other small to medium-sized vessels.

In conclusion, understanding the role of the bow in boat construction, material choices, and various construction techniques is essential for designing a boat that performs well and meets its intended purpose. Boat builders must carefully consider the interaction between the bow and the water, as well as the overall performance and aesthetics of the vessel.

Bow Impact on Crew's Experience

The design of a boat's bow plays a significant role in shaping the crew's experience while navigating in various sea conditions. A well-designed bow not only contributes to the vessel's structural stability but also affects the comfort and safety of the crew on board.

One of the key factors determining crew comfort is the incidence of green water and spray on the deck. Green water refers to solid water that breaches the vessel's bow, while spray consists of airborne droplets. The impact of bow flare slamming and pressure peaks may result in green water and spray, potentially affecting the accommodation areas near the bow and leading to wet and slippery decks. This could directly impact the crew's safety and working conditions.

Furthermore, the shape and design of the boat's bow have a direct influence on the vessel's behavior in different seas. A well-designed bow provides a smooth ride in rough seas, reducing the likelihood of vertical accelerations that cause discomfort. In contrast, a poorly designed bow may struggle to effectively cut through waves, leading to increased pitch motions and a less comfortable ride.

In addition to comfort, the bow design has implications for crew safety while transiting inlets, as illustrated by an incident at Haulover Inlet . Ensuring crew safety in such situations requires careful consideration of the vessel's bow design, taking into account possible impacts during high-speed navigation or challenging sea conditions.

Lastly, the bow's structural features can directly impact the crew's accommodation. A well-insulated and robust bow structure will offer more protection to cabins located near the bow, ensuring better noise insulation and preventing water ingress from green water and spray.

In conclusion, the design and features of a boat's bow can significantly impact crew experience by affecting comfort and safety. A well-designed bow enables smooth navigation, provides better accommodation, and ensures the crew's safety in various sea conditions.

Different Bows for Different Boats

Various types of boats and ships necessitate diverse bow designs to fulfill their distinct purposes and challenges. The bow is the front part of a boat or ship that encounters water first, considerably affecting the watercraft's overall performance, efficiency, and maneuverability.

Fishing boats often emphasize stability and capability to withstand diverse weather and sea conditions, requiring a bow that can reduce water resistance. The raked bow is a favorable choice for these boats, as it offers good seaworthiness and keeps the vessel steady while lowering fuel consumption.

Powerboats frequently incorporate bulbous or wave-piercer bows to minimize resistance and maintain better control at high speeds. The bulbous bow is specifically designed to reduce drag below the waterline, while the wave-piercer bow cuts through waves, minimizing the upward and downward motion of the boat.

Sailing boats, particularly racing or high-performance yachts, may feature axe or inverted bows which are known to improve vessel speed. The axe bow is designed with a sharp, narrow entry to slice through water, reducing drag and increasing efficiency. The inverted bow, also known as a reverse bow, slopes backward to achieve a more streamlined shape. This sleek design allows sailing boats to cut through waves with minimal resistance and maximizes speed.

Cargo vessels and tankers are primarily focused on optimizing their cargo capacity and fuel efficiency. Bulbous bows are popular in these ships because they help to reduce fuel consumption and increase stability. The bulb-like protrusion at the waterline breaks the water into a wave, which reduces the vessel's overall drag.

Motor yachts, often designed for luxury and comfort, usually opt for spoon or flared bows . Spoon bows have a rounded shape that allows smooth water flow, reducing spray and providing a comfortable ride. Flared bows extend outward and upward, providing extra buoyancy and preventing water from splashing onto the deck, ensuring a pleasant and dry on-board experience.

In conclusion, the selection of bow design plays a crucial role in the performance, efficiency, and comfort of various types of watercraft. The choice ultimately depends on the intended use, speed, and desired seaworthiness of the vessel.

Bow's Role in Steering and Navigation

The bow, located at the front of a boat, plays a vital role in the steering and navigation of the vessel. Its design and shape significantly influence the efficiency with which the boat moves through the water. In many boats, the bow is accountable for helping the boat achieve directional stability, as well as maneuverability in various waterway conditions.

An essential element in the bow's role in steering and navigation is its relationship with the rudder system. Typically located at the stern or the rear end of a boat, the rudder serves as a primary steering mechanism. Rudder motions cause the boat to turn, while the bow shape and hydrodynamic forces maintain the course. In earlier times, boats relied on a steering oar , which fulfilled a similar role as the contemporary rudder.

Additionally, the bow contributes to a boat's ability to navigate tight spaces and dock in various circumstances. The tiller , a lever attached to the rudder, plays a significant part in this regard. When using the tiller properly, the boat can steer at different angles and approach docks or other vessels with ease.

To successfully navigate through a waterway , the boat's bow design needs to consider factors such as water disturbance, friction, and resistance. In this context, the bow's shape allows a vessel to slice through water efficiently, reducing water resistance and improving steering capabilities.

Overall, the bow serves a crucial role in steering and navigation. Its design, working in conjunction with the rudder, tiller, and boat's overall hydrodynamics, grants a vessel the ability to traverse waterways, dock with precision, and maintain course with confidence and ease.

Naval Architecture and Bow Design

Naval architecture is a specialized field of engineering that deals with the design and construction of ships. One of the critical aspects a naval architect must consider in ship design is the bow. The bow of a ship affects its hydrodynamic performance, including movement through water and overall resistance to motion. Several special bows have been developed over time, each offering distinct advantages in certain situations.

One common bow design found in various ships is the plumb bow. A plumb bow is a vertical, straight-edged bow that has maximum waterline length. This design allows for greater hull speed and helps achieve better hydrodynamic efficiency.

The raked bow, on the other hand, slopes towards the rear of the ship, providing a streamlined shape that reduces resistance when moving through water. Clipper bows, which are characterized by a sharp curvature, are optimized for speed and have been used in traditional sailing ships for centuries.

In contrast, the bulbous bow is designed to optimize the hydrodynamic parameters of large vessels, such as container ships and cruise liners. It reduces drag by redistributing water around the hull to create a smoother flow. This innovation not only enhances the ship's performance but also improves its fuel efficiency.

Another innovation in ship design is the inverted bow, also known as the X-bow . This type of bow slopes forward rather than backward, resulting in a longer waterline, increased payload capacity, and improved seakeeping.

When designing a ship, naval architects take into consideration various hydrodynamic parameters, such as drag, lift, and stability. These factors are influenced by the shape and curvature of the bow. By carefully selecting the appropriate bow design for specific ship types, they can achieve a balance between performance, efficiency, and safety.

In summary, naval architects play a crucial role in ship design, particularly in the development and application of advanced bow designs. Understanding the relationship between bow curvature and hydrodynamic parameters allows ship designers to create vessels that are efficient, effective, and safe for a wide range of maritime applications.

Bow in Nautical History and Culture

The bow, the front part of a boat or ship, has a long and storied history in nautical culture. The origin of the term "bow" can be traced back to the Old Norse word 'bógr', which meant 'shoulder' and referred to the forward, curved portion of a ship that resembled a human shoulder. This was an important part of ship design, as it allowed ships to cut through the water efficiently, minimizing resistance.

In French, the term 'proue' is used for the bow. This word, like its English counterpart, has its roots in ancient languages, deriving from the Latin word 'prora'. The bow has been a significant part of ship design and culture across different civilizations, showcasing varying interpretations of efficiency and aesthetics.

Different types of bows have emerged over the years, each suited to the needs and constraints of their respective eras. One such type, the straight-stem bow, was a common feature of early sailing ships. This design allowed the ships to move through the water with ease, maximizing stability and reducing drag.

In more recent history, the introduction of motor-powered vessels led to the development of new bow designs, such as the bulbous bow. The bulbous bow is characterized by a rounded protrusion at the waterline that projects forward from the ship's main bow. This innovative design reduces the wave-making resistance of the ship, resulting in improved speed and fuel efficiency.

Throughout the ages, the cultural significance of the bow has remained steadfast. In many maritime traditions, it is customary to adorn the bow of a ship with a figurehead, a carved representation of a deity or mythical creature, as a symbol of protection and guidance. Figureheads were especially prominent during the Age of Sail, serving as both talismans and expressions of a ship's identity.

In conclusion, the bow has played a pivotal role in the development and culture of maritime societies across the world. As shipbuilding technology has evolved over the centuries, so too have the designs of ship bows, each reflecting the needs and values of the people who created them.

Choosing the Right Bow

When looking for a boat, it is essential to consider the type of bow that will best suit your needs, as it greatly impacts the boat's performance and overall capabilities. There are several types of bows , including pointed and round bows, each with its own characteristics and advantages.

Pointed bows have a more efficient design in terms of creating lift and are generally faster. However, they may not be as stable as their round counterparts, potentially leading to difficulties in control. On the other hand, round bows offer more stability, making them a solid choice for those prioritizing safety and ease of maneuvering over speed. Both designs have their merits, and your choice should depend on your specific needs and preferences.

In recent years, the x-bow design has emerged as an innovative bow type that addresses concerns such as rough seas and energy efficiency. This design typically features a horizontal, reverse-facing bow, allowing for smoother rides and increased fuel efficiency. When assessing bow options, it's important to consider the direction and specifications that align with your intended use of the boat.

Beyond traditional bow designs, there is a vast array of custom variations and unique shapes that cater to specific needs. Your choice should account for factors such as wind and water conditions, the boat's intended purpose, and the desired level of maneuverability. Furthermore, carefully evaluating the boat's specifications, such as its superstructure and engine power, will ensure that the chosen bow type complements your boat's overall performance.

In summary, selecting an appropriate bow type is a crucial aspect of boat shopping. By considering factors such as the general types of bows (pointed, round, and x-bow), specific design and direction, specifications, and overall compatibility with your boat's performance, you are better equipped to make an informed decision that caters to your unique needs and preferences.

Frequently Asked Questions

What is the purpose of the bow on a boat.

The bow of a boat is the frontmost part of the vessel, playing a crucial role in its performance, handling, and overall aesthetics. It influences the way a boat interacts with water, ensuring smooth navigation and stability. The bow also plays a significant part in determining the boat's overall speed and maneuverability.

How does the shape of the bow affect a boat's performance?

The shape of the bow impacts many aspects of a boat's performance, including its speed, handling, and the ability to cut through waves. A well-designed bow provides lift, reduces drag, and ensures a smooth ride in various water conditions. Additionally, the bow's shape is essential for the vessel's efficiency. For instance, a sharp bow can effectively cut through water, whereas a rounded bow helps displace water, preventing excessive spray.

What materials are commonly used to construct the bow?

Various materials can be used to construct the bow of a boat, including wood, fiberglass, aluminum, and steel. Wood is a traditional choice for building the bow, offering a classic aesthetic and warmth. Fiberglass is a popular modern material known for its lightweight and smooth finish, while aluminum and steel are typically used for constructing robust, durable bows in larger vessels and commercial boats.

What are the different types of bow designs?

There are several types of bow designs, each with their advantages and intended uses. Some common bow designs include the traditional V-shaped bow, which is excellent for cutting through waves and providing a smooth ride in choppy conditions. The U-shaped bow, with its rounded bottom, is suitable for displacement hulls and offers increased buoyancy and stability. Another bow design is the X-bow, known for reducing resistance and providing excellent fuel efficiency while maintaining a high level of stability.

How do boat manufacturers choose a bow design?

Boat manufacturers consider various factors when choosing a bow design for a specific model. They take into account the intended use, desired performance attributes, and aesthetic preferences. Manufacturers analyze factors such as speed, handling, fuel efficiency, and passenger comfort when selecting a suitable bow design. Additionally, they may experiment with innovative designs and materials to improve on existing designs and meet the demands of modern-day boating.

In nautical terms, what is the opposite of the bow?

In nautical terms, the opposite of the bow is the stern. The stern is the rear part of a boat, providing the mounting point for the vessel's propulsion system or outboard motor. Similar to the bow, the design of the stern significantly impacts the overall performance, stability, and aesthetics of the boat.

Q&A With Boating Design Firm

Charlie (Sea Magazine): Hello, dear readers. I'm Charlie from Sea Magazine, and today, I'm joined by Alex, a senior designer at Fluid Dynamics, a renowned boat design firm. We're here to discuss bow designs of boats and its significance. Welcome, Alex.

Alex (Fluid Dynamics): Thank you, Charlie. It's great to be here to chat about something so central to boat design.

Charlie: Let's start at the beginning. When we talk about the 'boat hull,' what exactly are we referring to?

Alex: The boat hull is essentially the main body of the boat. It's the portion that sits in the water and dictates how the boat sits, moves, and interacts with water.

Charlie: So, as the boat moves boat forward, how critical is the role of bow shapes in this process?

Alex: Bow shapes play an instrumental role. Different bow shapes determine how a boat interacts with waves and water. It affects how water flows around the boat, influencing speed, stability, and fuel efficiency. When you look at a boat called, let's say, "The Ocean Whisperer," its bow design might be entirely different from another boat, purely because of its intended use.

Charlie: That's interesting. Talking about the parts of a boat, how does the steering wheel tie in with the design of the bow?

Alex: While the steering wheel doesn't directly interact with the bow, its placement and design have to account for how the boat sits due to the bow's shape. For instance, if the bow's design causes the boat to ride high, the steering wheel's position might be adjusted so the captain has a clear view ahead.

Charlie: On many ships and even most boats, we often see a swim platform. Could you explain its placement in relation to the bow?

Alex: Certainly. The swim platform is typically at the back, or stern, of the boat. While it doesn't directly relate to the bow, the boat's overall design, from bow to stern, needs to be harmonious. If the bow is designed to elevate the boat's forward section, the upper deck level might be raised, impacting where the swim platform sits in relation to the water.

Charlie: That makes sense. I've also noticed that on the left-hand side of many boats, there's a red light. Can you shed some light on this?

Alex: Ah, yes! That red light is one of the navigation lights. On the left-hand side or port side, you have the red light, and on the right-hand side or starboard, you'll see a green light. It's a nautical term and tradition that helps other vessels determine which direction a boat is heading in low visibility or nighttime conditions.

Charlie: Speaking of design features, why is room inside a vessel such a focal point when considering the bow's shape?

Alex: A well-designed bow not only impacts the boat's external performance but can also dictate the room inside the boat. A bow with a broader cross-section might provide more interior space. It's all about finding a balance between performance and comfort.

Charlie: Before we wrap up, one last question: How does the given length of a boat impact the bow design?

Alex: The given length determines how much weight and volume the boat can carry. Larger boats might have a deeper draft, meaning they sit lower in the water. This can influence the bow's shape as the lowest point needs to account for stability and wave interaction.

Charlie: Alex, thank you so much for this insightful discussion. I'm sure our readers at Sea Magazine now have a clearer understanding of the intricacies of bow design.

Alex: It was my pleasure, Charlie. Always happy to share knowledge about boat design with passionate enthusiasts.

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This New Superyacht Concept Sports a Razor-Sharp Bow Inspired by the Military Vessels of WWII

The diamond 58 is decidedly pointy like its namesake., rachel cormack.

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The studio found that superyachts between 130 feet (40 meters) and 262 feet (80 meters) showed a marked increase in efficiency, and it’s planning to create a whole Diamond line starting with the 190-footer in question.

Officially known as the Diamond 58, the superyacht is imagined with a hybrid diesel-electric propulsion system that promises a cruising speed of around 28 knots. It can also sail sans emissions at 10 knots for about four hours, according to the company.

It’s not all about performance, of course. The Diamond 58 looks good, too, with bold, contemporary lines and an inordinate amount of deck space. As you might expect, it comes with a laundry list of amenities to ensure you’re plenty entertained at sea. There is a Jacuzzi in the bow for soaking, a helipad on the upper deck to facilitate comings and goings, as well as a large tender garage that can accommodate a full fleet of water toys.

Elsewhere, the main deck is equipped with fold-down side terraces aft that increase the size of the already generous beach club when desired. From here, you can enjoy another pool or head to the hydraulic swim platform that pops out from the transom for an ocean dip.

Diamond 58 seems like quite a sharp concept, indeed.

Rachel Cormack is a digital editor at Robb Report. She cut her teeth writing for HuffPost, Concrete Playground, and several other online publications in Australia, before moving to New York at the…

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Unusual superyachts: 2008 Feadship Predator – the first axe-bow for the Dutch builder

A predator on the loose

The 72.80-meter Predator will be remembered in the yachting history as the first Feadship with an axe-bow.

This motoryacht also broke several other records at the time of her launch in 2008. Despite being among the quietest Feadships ever built, Predator has the tallest engine room, the longest uninterrupted interior views, the largest draught and carries an unprecedented four-engine propulsion package.

When built in 2008, the brief stated that she needs to reach over 28 knots without the use of jets or gas turbines. This is one of the reasons Predator uses an axe-bow that cuts through the waves. She throws no bow wake even in five-meters seas.

De Voogt Naval Architects has ensured that the axe-bow concept is completed in a yacht-like fashion. Predator’s profile flows elegantly aft to emphasize the speedy character of the yacht. And her dramatic looks have been further enhanced by the choice of red, white and blue exterior colors.

Another fun fact about Predator: despite being a 70+m yacht she can accommodate only six guests, including the owner.

The yacht has space for two large customised tenders named Predator A and Predator B, which replicate the inverted bow of the mother ship.

Four MTU diesel engines give a combined power of over 23,000 hp, running in tandem with two custom-built Renk reduction gears. These gearboxes drive Rolls Royce controllable pitch propellers, which are an imposing 3.20 meters in diameter.

Read more about Feadship superyachts:

Feadship Hasna

Feadship Ecstasea

Feadship Mirage

Feadship Vertigo

What is a Bow of a Boat? Types of Bow Designs

We will discuss a very important part of a ship or a boat – Bow .

Ships and boats face immense resistance on the water for the simple fact that compared to air, water produces more drag when moved through.

Hence the ships need to be designed in such a manner that the resistance is kept to the minimum. While conceptualizing a ship, the bow designs are the main factors.

While ships that are slender and curvier have less Wave Making Resistance while on the other hand, for the fuller ships the components of Wave Breaking Resistance are a more important factor.

What is the Bow of a Boat?

The bow is the name for the forward ends of the hull on boats and ships. It is the opposite end from the stern. The bow is that part of the ship that comes in contact with the water first and can be designed in a manner to control how the waves interact with the ship.

Where is the Bow of a Boat?

The bow is located in the front of a boat or ship. The bow of a boat usually has a pointed shape extending out of the water to cut through waves. This is designed to reduce drag and allow smoother movement through the water.

Types of Bow Designs

Though new designs seem to be dropping in every now and then, they seem to have reached a saturation point as most of them seem to be improvements made on old designs. With all that kept aside, here are some bow design types:

• The bulbous bow
• A normal bow without a bulb
• Other special bows

What we today call a normal bow has evolved from what was previously a vertical bow . Rake may be defined as the angle the ship’s stem makes with the waterline. This bow has the maximum waterline length of all.

A straight-edged vertical bow that is perpendicular to the waters is known as a plumb bow . If we don’t include an X-bow or Inverted bow, they happened to have the maximum waterline. This is what enables it to attain greater hull speed.

Pic courtesy: http://www.setzerdesign.com/new-concepts/plumb-bow-superyachts

Raked bow designs can be said to be the most commonly used bow. It is also the most popularly used. The line of the bow is flat. It does not have any curves. The acute angle has to be less than 45 degrees. This enables the forward waterline position to allow more accommodations and especially a larger forward stateroom V-berth.

Clipper Bow

Clipper bow designs are some of the most traditional types of bow designs. The angle at which a ship’s hull plate or planking departs from the vertical in an outward direction with increasing height is known as a flare. They are used in conjunction with rakes.

Apart from easing the pitch motions flaring keeps water off the decks. Sometimes the rake is set up in such a manner that it protects the submerged portion during the collision by taking the impact first. This is known as the ‘crumple zone’.

In general, these types are called clippers . The way the rake is set up here increases the center of buoyancy as well as the stability of the ship. This, in turn, increases the GM which is an important factor for the ship’s stability.

Read more: What is a clipper ship?

A spoon bow is a kind of bow design that convexes to the deck. It is called so because of its spoon-like appearance. This curve near the waterline is the most gradual. Such bow designs produce wave-making resistance due to the curvature at their cross-section.

Bulbous Bow

In bulbous bows, there is a protruding bulb at the bow just below the waterline. Here the water flows around the hull such that it reduces drag and increased fuel efficiency (up to 12% to 15% more than those ships that don’t have a bulbous bow), speed, range, and most importantly stability.

A bulbous bow increases the buoyancy of the front part and thereby decreases some of the up and down motion of the ship.

They are especially effective when the waterline length is longer than 15 meters and when the vessel is supposed to operate at its maximum speed most of the time. Such conditions are usually met by naval vessels, cargo ships, passenger ships, tankers, and supertaskers.

A bulbous bow would be detrimental to efficiency if used on smaller watercraft and thereby never used on powerboats, sailing boats , yachts, and other recreational boats.

The bulbous bow does its job by producing what is called the bow wave . The bulb forces the water up forming a trough and when added to a conventional bow in the right manner cancels out the wave produced by it, hence reducing the vessel’s wake.

A bulbous bow is popular in seagoing cargo ships and vessels that are larger in size.

Also read: What is a Hydrofoil Boat?

Parabolic and Cylindrical Bows

Compared to the straight sharp bow section ship designers sometimes tend to design blunt stems, thereby creating a parabolic shape. They are sometimes using in addition to bulbs to tackle the Wave Breaking Resistance. These bow designs are popular in bulk carriers of a fuller build.

Parabolic bows have a close resemblance to cylindrical ship bows since they are also designed keeping a bigger form factor in mind. They have the ability to absolutely minimize the Wave Making Resistance if proper care is taken while designing them. They are ideal for ships in fully loaded conditions.

So, what is the job of an axe? To cut trees, right? The axe bow used in ships has a similar task too, that is cutting through the water. The long deep and narrow fore portion of the hull resembles an axe. The design includes a vertical stem line.

This shape allows the ship to easily pass through the waves and keeps the up and down motion of the ship to the minimum when compared to a normal bow. The lower portion of the fore-end of the hull is known as the forefoot. It remains submerged in the water and thus less open to slamming.

This has its disadvantages as well because a ship with an axe bow requires more power from the rudder while maneuvering.

Inverted Bow

An inverted bow, often known as a reverse bow is referred to those in which the most extended point is not the top, but rather the bottom. They maximize the waterline, thereby resulting in tremendous hull speed and better hydrodynamic drag when compared to normal bows. To achieve that they sacrifice buoyancy and tend to dive under the waves instead of going above.

Just like the axe bow designs the pitching (up and down motion) and slamming are much reduced resulting in a much more enjoyable journey for the crew. They are quite operable in the medium tide and are easily maneuverable.

They are fuel-efficient too. Another positive aspect of the bow is that it doubles up like a deck and can accommodate the personnel.

Previously they were popular on battleships and large cruisers. But they became unpopular when newer designs came about. This was because they were not good at tackling high waves and became wet at high speed.

However, they have re-entered the market with all glory and are used nowadays mostly in AHTS (Anchor Handling Tug Supply) vessels, Seismic Vessels, Offshore and Pipelay Vessels, drillships, etc.

A ram bow is more of an extension that is built underwater below the hull of a ship. It is a kind of weapon which is used to pierce the hull of an enemy ship. It is not used much in today’s time but it was quite popular a few decades ago.

As we came to know earlier almost all possible combinations of bow designs have been attempted and so any bow that you come across must either be present in this list or would be the combination of the ones present here.

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What is the name of a measurement from the bow of the boat to the waterline.

I’d call it overhang

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Damen Sea Axe Fast Yacht Support vessel to be unveiled in Monaco

By superyachts.com

Amels has today announced the unveiling of a new and innovative concept in support vessels to occur at the upcoming Monaco Yacht Show.

Featuring an adapted version of Damen Shipyard’s exclusive Axe Bow Concept that is already a standard part of Fast Crew Supply Vessels, the boat is created to enhance life onboard large yachts.

The Axe Bow design itself was created via a union between Damen and the Technical University of Delft, as well as encompassing significant contributions from the chief engineers and captains of Amels yachts.

Far from a conversion of the already released boats, the Sea Axe is a purpose built vessel that features a 50 metre hull and 9.2-metre beam, mirroring that of Damen workboats but with a much finer interior and finish.

With its 30 metre open deck and a deck cargo capacity of 250 tonnes, the vessel works to relieve the primary yacht of stowage that occupies valuable space.

Carrying full classification that requires a crew of only six, the Sea Axe is aimed at supporting the charter market or extremely large sailing yachts with limited inventory space.

The vessel will be capable of reaching speeds up to 28 knots, and has a transatlantic range of 18 knots.

The Damen Shipyard currently has two of the unique vessels under construction, the first of which is due to be delivered in December.

The Sea Axe concept will be presented in September at the Amels’ T-Central stand in Monaco.

"With its 30 metre open deck and a deck cargo capacity of 250 tonnes, the vessel works to relieve the primary yacht of stowage that occupies valuable space."

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Advanced Hullform

Metal Shark’s 165 Defiant utilizes the Damen “Enlarged Ship Concept,” where the hull of a ship is extended to create an elongated hull form that substantially enhances seakeeping, operability and crew comfort by reducing vertical ship motions. The “Sea Axe” bow design represents a further evolution of the Enlarged Ship Concept. An Axe Bow vessel features an extremely slender and deep bow, without any flare, that provides unparalleled soft seakeeping characteristics, unrivaled operability, and increased fuel economy over conventional hull designs.

All Defiant offshore ships feature durable welded construction. The 165’ Defiant features a steel hull with aluminum deck and superstructure. Metal Shark’s expertise in patrol boat production, with hundreds of vessels in service worldwide, coupled with Damen’s technical expertise and global presence with shipyards worldwide, ensures a state of the art, precision craft that is built to last. The 165 Defiant is produced at Metal Shark’s large vessel shipyard complex in Franklin, Louisiana USA where upon completion vessels may be easily launched in the Gulf of Mexico.

The 165 Defiant features Metal Shark’s pillarless glass windshield, which significantly reduces blind spots. This, combined with the vessel’s elevated superstructure, provides ideal visibility for the crew. The 165 Defiant’s wheel house has been placed at the location where ship motions are least: approximately one third distance from the stern. This positioning creates the best possible working environment for the crew. The 165 Defiant been designed to allow for custom accommodations. A high-speed tender can be easily accommodated on the aft deck, where it can be launched from and recovered into an integrated stern slipway.

Crew Ergonomics

The 165 Defiant’s major controls and communication devices are integrated into the helmsman’s seat. Even in the most inclement conditions, the helmsman can easily and comfortably control the ship. Throughout the vessel, flexible carpentry and floating floors have been deployed to reduce vibration. Like all Metal Sharks, the interior layout may be fully customized to suit virtually any mission requirement.

Metal Shark’s Franklin Shipyard

Defiant Offshore Patrol vessels are fabricated at Metal Shark’s large vessel shipyard complex in Franklin, Louisiana USA. This 25-acre waterfront facility is situated with direct access to the Gulf of Mexico and supports aluminum and steel shipbuilding efforts for vessels up to 250’. Metal Shark employs its own team of naval architects, master welders, and craftsmen. The company has extensive experience in producing custom patrol boats, with hundreds of vessels in service with the United States Coast Guard, Navy, Air Force, Army, and the militaries of partner nations worldwide.

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Discussion in ' Boat Design ' started by tz3dcom , Aug 6, 2020 .

Hello all, This is a new 36.6M conceptwith a Axe Bow design, Does anyone know this type bow has any advantages and disadvantages in this size boat ? Here is the exterior 3D VR Demo KeyShotXR http://tz3dstudio.com/360/36m/36m.html Thanks for your comment.  

Attached Files:

jehardiman Senior Member

Depends on the design seaway. In some seaways it works, in others it will sink the vessel...YMMV.  

Squidly-Diddly Senior Member

after that Italian Navy ship with what is basically a "double bow", I'm thinking maybe a quadruple bow "sawtooth" might be about right. Idea would be to get a mix of wave piercing and wave defection but always having defection as the last operation to next too much spray coming over the bow. Double the number of points of bow in pic.  

Italian ship.jpg

DCockey Senior Member

tz3dcom said: ↑ This is a new 36.6M conceptwith a Axe Bow design, Does anyone know this type bow has any advantages and disadvantages in this size boat ? Click to expand...

DCockey said: ↑ Am I correct that your studio spent time creating a design, and are now asking if a principal feature of the design, the bow shape, has any advantages? That is an interesting approach. Click to expand...

CocoonCruisers Junior Member

Clearly that question may appear slightly bizarre on such a technical forum. But meanwhile tz3dcom's bow already fulfils a purpose: it sure looks cool. I guess the main question here is if the marketing blurb can be backed up with an actual need or advantage. (And it seems there is a bit of confusion between axe bow, as used on patrol boats, and the X-bow on some Burbon ships.) As for a need, i'd say no: the purpose of such a boat is for the billionnaires to enjoy the champaign. The captain will know fairly well that if they all end up puking because of high speeds in horrendous seastates (which is the purpose of the real x-bow, look up the videos), he will get fired. So in actual usage, the thing will not be driven hard enough for the bow shape to matter. And your yacht looks a little too fat and low for it to work properly anyway - the much larger and higher axe bow ocean supply ships are fairly slender. As for advantages, it might be a little bit softer in medium speeds, but go a little too fast and you won't see much anymore, and you'd probably risk greenwater crashing through the front windows at lower speeds than with a more classic bow. So i wouldn't lean too far out of the window in terms of functionality promises. BTW be careful with names that stand for patented concepts.  

Yobarnacle Senior Member holding true course

Axe bows are purposed to eliminate bow shadow. With high bowed large vessels, the area in front of a conventional bow for considerable distance is blocked from view. Called the "Bow Shadow". Vessels like tugs and other special designs, need to work close to other structures and vessels. Eliminating bow shadow reduces close quarters collisions. Sending a hand on the dock with a walkie-talkie , to take a look in front, also works, but crews are smaller and getting smaller. Also, axe bow makes observing forward draft marks easier, and observing the anchor when heaving up snug in the hawse hole more visible. Many times the anchor must be relowered and resnugged several times, before it twists to the correct angle for housing in the hawse pipe.. Better visibility is the sole advantage of Axe bows. Except maybe less material used in construction? Because of bow shadow, navigation regulations require stationing the underway lookout as low and as far forward, as possible.  

Yobarnacle said: ↑ Also, axe bow makes observing forward draft marks easier, and observing the anchor when heaving up snug in the hawse hole more visible. Many times the anchor must be relowered and resnugged several times, before it twists to the correct angle for housing in the hawse pipe.. Click to expand...

My experience is with large commercial vessels. A boathook won't faze a ten ton anchor. Axe bows on yachts also reduce bow shadow, though their bow shadow is minimal compared to a ship whose bow is five stories high. The NA will design he solutions for the small problems. NAs do that specialized work!  

Yobarnacle said: ↑ My experience is with large commercial vessels. A boathook won't faze a ten ton anchor. Axe bows on yachts also reduce bow shadow, though their bow shadow is minimal compared to a ship whose bow is five stories high. The NA will design he solutions for the small problems. NAs do that specialized work! Click to expand...

Squidly-Diddly said: ↑ after that Italian Navy ship with what is basically a "double bow", I'm thinking maybe a quadruple bow "sawtooth" might be about right. Idea would be to get a mix of wave piercing and wave defection but always having defection as the last operation to next too much spray coming over the bow. Double the number of points of bow in pic. Click to expand...

jehardiman said: ↑ Depends on the design seaway. In some seaways it works, in others it will sink the vessel...YMMV. Click to expand...

As for a need, i'd say no: the purpose of such a boat is for the billionnaires to enjoy the champaign. The captain will know fairly well that if they all end up puking because of high speeds in horrendous seastates (which is the purpose of the real x-bow, look up the videos), he will get fired. So in actual usage, the thing will not be driven hard enough for the bow shape to matter. And your yacht looks a little too fat and low for it to work properly anyway - the much larger and higher axe bow ocean supply ships are fairly slender. Click to expand...

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Tz3dcom, while I understand that neophytes come to this site to learn, I abhor people coming who have yet to do due diligence in their studies. tz3dcom said: ↑ So serious .... has any example to prove it will sink the vessel ? as we know many warships with this type bow a hundred years ago. Click to expand...

Wave-peircing & Axe bows, how about Saw bows?

axe bow design

what do you think of this one? (river cruiser for relaxed cruising)

Blaxell Surfrider - Floor problems

One-armed bow cleat?

Bowrider hull

Bow digging during corners

"future of boats" sunbeam 32.1 stealing my saw bow concept (sort of).

Complex bowsprits on reversed bows

15 foot center console design... help with the bow?

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Politics latest: Court ruling 'blows PM's claims about Rwanda plan out of the water'

Rishi Sunak has warned voters the next five years "will be some of the most dangerous yet", and only the Tories have plans to keep them safe. Meanwhile, the government may have yet another legal battle on its hands over its attempts to tackle illegal migration.

Monday 13 May 2024 23:00, UK

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• Legal setback for Rwanda plan 'blows PM's claims out of water'
• Jon Craig:  Court ruling may not bode well for controversial policy
• Sunak warns of 'nuclear escalation' threat
• Catch up on PM's security speech  | Read Tamara Cohen 's analysis
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Thanks for following on an extremely busy day in Westminster.

We'll be back from 6am, but until then, here are the headlines:

In a dramatic knife-edge vote, MPs have voted that there should be no hiding place for suspected Commons sex pests.

Former prime minister Theresa May led a small group of eight Conservatives voting with Opposition MPs to defy the Commons Leader Penny Mordaunt.

To the fury of many Opposition MPs, Ms Mordaunt wanted MPs accused of serious sex or violent offences to be barred from parliament only when they’re charged.

It was officially a free vote. But the vast bulk of MPs voting to delay a ban until a charge were Conservatives, including several Cabinet ministers.

That was brave, so close to a general election. Surely those MPs who voted against a ban upon arrest will be attacked by their political opponents at the election for being soft on suspected sex pests?

The timing of the vote was perhaps unfortunate, coming amid renewed controversy earlier this week over sex pest Charlie Elphicke, the former Conservative MP who was jailed for sex offences.

At the weekend his ex-wife Natalie, who defected from the Conservatives to Labour last week, was accused of lobbying a former justice secretary, Sir Robert Buckland, on his behalf, an allegation she dismissed as "nonsense".

And despite missing the weekly meeting of the parliamentary Labour Party earlier, Ms Elphicke duly voted with her new colleagues for a ban which would have almost certainly penalised her ex-husband had it been in force.

After the vote, leading supporters of the arrest ban were jubilant and stunned by the closeness of the vote. “Incredible!” Labour’s Stella Creasy told Sky News. Mr Rees-Mogg, however, condemned the proposal as a “power grab”.

It’s a historic vote. It doesn’t matter how close it was. Accusers will argue they’re now better protected. And MPs who supported the tougher ban argue that it brings the Commons into line with other workplaces.

Well, up to a point. MPs still have many perks and privileges that other employers and employees don’t. And Parliament still has a long way to go before its working practices and grievance procedures are brought fully up to date.

As we reported earlier, MPs today backed a proposal that would allow parliament to ban those from the estate who have been charged with sexual or violent crimes.

The amendment was to "leave out that a charge needs to be made for risk-based exclusion to apply" on the parliamentary estate.

This proposal, tabled by the Liberal Democrats, passed by 170 votes to 169.

Reacting to the win, MP Wendy Chamberlain said: "This is an important step towards making parliament a safe and modern place to work.

"It is not about the guilt or innocence of any individual MP, but about safeguarding.

"It's really important that parliament is just as safe as any other workplace and that everyone is held to account by similar rules."

By Alexandra Rogers , political reporter

The government has scrapped plans that critics argued would have "criminalised" homelessness following a backlash from Conservative MPs.

The Criminal Justice Bill - which originally contained provisions to target "nuisance begging" - has now been watered down by the government to quell a mounting rebellion of about 40 backbenchers.

Homelessness charity Crisis welcomed the changes but warned the "premise of the proposed laws remains the same".

MPs had raised objections to the bill's stated aim of combatting "nuisance begging", which could have targeted people sleeping in a doorway, those creating "excessive smell" or those who are "looking like they are intending to sleep on the streets".

The original version would also have given police or local authorities the power to issue "nuisance begging directions" to move people on, with a failure to comply potentially resulting in a month in prison.

You can read more from Sky News below:

The Sky News live poll tracker - collated and updated by our Data and Forensics team - aggregates various surveys to indicate how voters feel about the different political parties.

With the local elections complete, Labour is still sitting comfortably ahead, with the Tories trailing behind.

See the latest update below - and you can read more about the methodology behind the tracker  here .

A landmark parliamentary inquiry into traumatic childbirths has called for an overhaul of the UK's maternity services after finding poor care is "all-too-frequently tolerated as normal". 

The report calls for a new maternity commissioner who will report to the prime minister, better staffing levels on maternity wards, and for mothers to be listened to more.

On the Sky News Daily, Matt Barbet speaks to campaigner and mother-of-two Tinuke Awe about her experiences of giving birth, and is joined by Sky correspondent Laura Bundock to find out what the government plans to do to address the issues raised in the report.

By Connor Gillies , Scotland correspondent

The police investigation involving Nicola Sturgeon's husband is "moving on" with prosecutors to receive a file within weeks, Scotland's most senior officer has told Sky News.

The former first minister and SNP leader's spouse, Peter Murrell, has been charged in connection with embezzlement of party funds.

In her first interviews since taking on the UK's second biggest police force, Chief Constable Jo Farrell insisted her officers are "objective" but refused to be drawn on whether the long-running probe will end imminently.

The investigation, dubbed Operation Branchform, was launched in July 2021 after officers received complaints about how SNP donations were used.

There were questions about more than £660,000 raised for a second Scottish independence referendum campaign.

In January 2023, Rishi Sunak made five promises.

Since then, he and his ministers have rarely missed an opportunity to list them. In case you haven't heard, he promised to:

• Halve inflation • Grow the economy • Reduce debt • Cut NHS waiting lists and times • Stop the boats

See below how he is doing on these goals:

Over in the Commons, and MPs are voting on a number of proposals that would allow parliament to ban those from the estate who have been charged with sexual or violent crimes.

The result of one particular amendment has just been confirmed.

It proposed to "leave out that a charge needs to be made for risk-based exclusion to apply" on the parliamentary estate.

Initially, a House of Commons commission proposed a risk assessment would take place on whether an MP should be prevented from attending the parliamentary estate if they were arrested on suspicion of committing such an offence - not only if they were charged.

However, MPs have just voted in favour of the proposal to reinstate the original intention of the policy.

The vote was extremely close - 170 to 169.

As we reported earlier ( see 19.46 post ), MPs are tonight voting on proposals that would allow parliament to ban those from the estate who have been charged with sexual or violent crimes.

But concerns have been raised they have been watered down.

Labour MP Jess Phillips has argued: "Exclusion at the point of charge sends a clear message to victims that not only will we not investigate unless a victim goes to the police, but we won't act unless they're charged, which happens in less than 1% of cases."

A series of amendments are being voted on tonight - including one that would revert the proposal back to that lower threshold of an arrest.

We'll bring you the results of the votes later.

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