sailboat data rival 36

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The Rival 36 Sailboat

The Rival 36, an aft-cockpit cutter, was designed by Peter Brett and built in the UK by Rival Bowman Ltd.

Published Specification for the Rival 36

Underwater Configuration:  Fin keel with skeg-hung rudder. There is also a shoal draft version with a Scheel keel, and a centreboard version.

Hull Material:  GRP (Fiberglass)

Length Overall:  35'10" (10.92m)

Waterline Length:  27'2" (8.3m)

Beam:  11'0" (3.4m)

Draft:  6'0" (1.8m)

Draft (Centreboard version):  Max 6'9" (2.1m), Min 3'9" (1.1m)

Rig Type:  Cutter

Displacement:  14,250lb / 6,464kg

Designer:  Peter Brett

Builder:  Rival Bowman (UK)

Year First Built:  1980

Number Built:  78

Owners Association:  Rival Owners Association

Published Design Ratios for the Rival 36

1. Sail Area/Displacement Ratio:  15.7

2. Ballast/Displacement Ratio:  39.2

3. Displacement/Length Ratio:  317

4. Comfort Ratio:  30.4

5. Capsize Screening Formula:   1.8

read more about these all-revealing numbers...

Summary Analysis of the Design Ratios for the Rival 36

1. A Sail Area/Displacement Ratio of 15.7 suggests that the Rival 36 will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go.

2. A Ballast/Displacement Ratio of 39.2 means that the Rival 36 will have a tendency to heel excessively in a gust, and she'll need to be reefed early to keep her sailing upright in a moderate breeze. 

3. A Displacement/Length Ratio of 317, tells us the Rival 36 is firmly in the ultra-heavy displacement category. Load her up as much as you like and her performance will be hardly affected, not that it was ever startling. Few if any sailboats are built to this displacement category these days - but they remain popular with some long-distance sailors.

4. Ted Brewer's Comfort Ratio of 30.4 suggests that crew comfort of a Rival 36 in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.

5. The Capsize Screening Formula (CSF) of 1.8 tells us that a Rival 36 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.

Any Questions?

How did the sailing press review the Rival 36?

The sailing press reviewed the Rival 36 positively, praising its heavy weather comfort, proven seakeeping ability, and solid construction.

Is the Rival 36 still in production and, if not, when did production end and how many of these sailboats were built?

Production of the Rival 36 ended in the early 1990s after approximately 78 hulls were built.

What, if any, alternative versions of the Rival 36 were built?

There were two alternative versions of the Rival 36: one with a lift keel variant, the 36C (for centreboard), which has a slightly shorter mast, and another with a shallow draught variant offered with Scheel keel.

What is the history of the builders of the Rival 36 and is the company still in business?

Rival Yachts was started by yacht designer Peter Brett in 1967 with the Rival 31 as its first model. The company went through various takeovers and mergers featuring Bowman, Starlight, and Rustler before ceasing production in the early 1990s.

What sailplan and rig options, if any, are available for the Rival 36?

The Rival 36 was offered with sloop rig as standard and cutter rig and furling headsail were offered as options.

What is the average cost of a secondhand Rival 36?

The average cost of a secondhand Rival 36 varies depending on its condition but typically ranges from $30,000 to $50,000.

What other sailboats have been created by the designer of the Rival 36?

Peter Brett, designer of the Rival 36, also designed other sailboats for Rival Yachts including the Rival 31, 32, 34, 38 and 41.

The above answers were drafted by sailboat-cruising.com using GPT-4 (OpenAI’s large-scale language-generation model) as a research assistant to develop source material; to the best of our knowledge,  we believe them to be accurate.

Other sailboats in the Rival range include:

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Review of Rival 36

Basic specs..

The boat is typically equipped with an inboard Volvo Penta MD2030 diesel engine at 29.0 hp (21 kW), which gives a max speed about 5.5 knots.

The fuel tank has a capacity of 182 liters (48 US gallons, 40 imperial gallons).

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

What is Capsize Screening Formula (CSF)?

The capsize screening value for Rival 36 is 1.81, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.0 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Rival 36 is about 185 kg/cm, alternatively 1040 lbs/inch. Meaning: if you load 185 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1040 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

What is Motion Comfort Ratio (MCR)?

What is L/B (Length Beam Ratio)?

What is Displacement Length Ratio?

What is SA/D (Sail Area Displacement ratio)?

Maintenance

Are your sails worn out? You might find your next sail here: Sails for Sale

If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

We are always looking for new photos. If you can contribute with photos for Rival 36 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

NEW LISTING – Rival 36 ‘RIVAL MISCHIEF’

Friday 2nd July 2021

Mark Cameron Yachts are delighted to have been appointed to act in the sale of the Rival 36 ‘RIVAL MISCHIEF’.

First launched in 1980 the Rival 36 was the last of the Rival designs to be drawn by Peter Brett, the man responsible for creating the Rival brand and its iconic reputation as a robust reliable cruiser. Originally built by Southern Boatbuilding Company before the the merging of the Rival and Bowman brands there was reportedly a total of 78 hulls produced in the class before production ceased in the mid 1990’s.

One of the later examples of the Rival 36 design RIVAL MISCHIEF was commissioned by a discerning owner and lavished with extras from the factory. She is a rare combination of options with the more versatile MkI interior combined with the shallower Scheel keel and wheel steering.  With only her 5th owner since built she has had enjoyed continual maintenance and upgrading, maintaining her Lloyds 100A1 classification through until 2005. Reluctantly offered for sale she comes with a comprehensive inventory including highlights such as:

• Gelshield coated underwater hull sections from new
• CopperCoat antifouling applied 2014
• Laid decks professionally re-screwed and re-plugged in 2020
• Blakes seacocks fitted for all underwater through hull fittings.
• Yanmar 3YM30AE marine diesel engine fitted new in 2015, less than 200 hours running time
• Sterngear replaced in 2015
• Whitlock Cobra 5R pedestal wheel steering system
• Stainless Steel fuel, freshwater and black water tanks
• Raymarine es78 MFD with Raymarine Quantum radar installed new 2017
• New galley stove, 2 burner, oven and grill installed new 2015
• Ebersapcher diesel fired blown air heating system installed new 2015

Lying on a berth in Bridlington, East Yorkshire RIVAL MISCHIEF is available for viewing strictly by prior appointment.

FIND FULL DETAILS OF ‘RIVAL MISCHIEF’ HERE

Rival 36 ‘RIVAL MISCHIEF’

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• Yachting Monthly
• Digital edition

• June 26, 2013

Yachting Monthly reviews the Rival 34

Product Overview

Manufacturer:, price as reviewed:.

What’s she like to sail? Her high bow is designed to give good protection in the cockpit and a secure feeling on deck. She’s best to windward, when her fine entry, modest beam and attractive sheer combine to provide an easy motion and a dry ride. But she’ll struggle to match the performance of a modern yacht for sailing downwind. A Rival 34 is superb for long-distance passage-making and very steady in heavy seas and strong winds, but in light conditions her performance and manoeuvrability will feel staid compared to modern fin keel yachts. With perfectly set sails, a Rival 34 should feel beautifully balanced. She’s quite a big boat to helm with a tiller, which sweeps across a cramped but reassuringly deep and well protected cockpit complete with a special liferaft locker – a wheel would take more space. A mainsheet traveller in front of the companionway and a fairly low boom put the onus for ‘health and safety’ on the crew! Top speed of this heavy-displacement yacht is likely to range between 6-8 knots under sail, with faster bursts downwind, or 5-7 knots under power. The deep keel version should be stiffer and point higher than the shoal draught version, but is less versatile for tidal cruising. Either one would do for drying out against a wall. Old sloops require extra physical effort. Winding in the 130% masthead genoa discourages short tacking, while Wild Rival’s piston hanks are more fiddly than a modern luff groove. Changing headsails is much more effort than shortening sail with a furling line and requires one or two crew to work on a pitching foredeck, but you get a far more efficient sail shape. Reefing requires one or two crew to work at the mast, but everything comes to hand without the increased complexity and friction of reefing lines led aft. Lazyjacks could be useful to catch the mainsail as it drops, but the relatively small area makes it fairly easy to flake along the boom. What’s she like in port and at anchor? When it’s time to berth in a marina, plenty of practice will be required for failsafe reversing with the Rival’s skeg and long fin keel and the turning circle will be wide compared to modern yachts. Unlike modern yachts, you also don’t get the luxury of spacious stern cabins with en suite heads and showers, and the main cabin feels narrow, but that means hand-holds are easy to grab. Wild Rival has neither a fridge nor pressurised water, so you don’t need to worry about drained batteries or constant refills for the water tank. With a solidly built teak interior and up to seven berths in a traditional ‘open plan’ layout, only the forecabin provides a degree of privacy. With four dedicated sea berths, she is clearly designed for sailing, rather than marina life – a good choice for a crew of hearties or a couple who really enjoy passage-making. Reflecting their traditional approach to cruising, Steve and Cathy drop and weigh anchor by hand without need for a windlass, a technique requiring complementary muscle and boat-handling skills. Would she suit you and your crew? If you really want a ‘sailing and motoring caravan’, or an exhilarating daysailer, the Rival 34 is not your kind of yacht. But if you’re after a boat that can sail around the world, she could provide a reasonably inexpensive solution to your dreams. A second-hand Rival 34 will be at least 30 years old. These yachts were extremely well built (to Lloyd’s Register 100A1), but a thorough survey is recommended, covering engine, rigging, sails, winches, electronics and all other bits that are expensive to replace.

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Lancer 36 Sloop

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Would like to get any information I can on the Lancer 36 sloop designed by Bill Lee. Thanks.  

I suggest that you check the archives. There was a good discussion on the Lancer 36 within the last month. Not a great boat. Jeff  

starlightventure Starlightventure's spin on the Lancer 36. They are a great boat for speed. It was the first boat under 40' to win the Trans Pac. They were built for ocean racing. They are light weight, 10,000. pounds, but a strong hull. The mast is deck stepped and ok if it is maintained, the shrouds must not be to loose or the mast rocking side ways back and forth will stress out the deck core where the mast is stepped, could be bad, if maintained its ok. They are approximately 30% lighter than a Catalina 36 so you tend to go over the top of the wave instead of plowing through it, and like all light weight racers it can be a rough ride with some slamming in over 20knots of wind. But a very fast and responsive boat. If you like to go fast then it may be the boat for you.  

You just replied to a 7 year old post!! :hammer  

And besides the post is perhaps a bit misleading post. Once upon a time the Lancer may have been considered a fast design, and may have corrected out well in a couple ancient Transpac, (but then again so did Ticonderoga) but by any reasonable modern standard (with a US Sailing PHRF rating of 126-132 depending on the rig and region) these are not particularly fast 36 foot boats. (A reasonably modern 36 footer would rate down around 72 to 81 or so) While the original design weight of these boats was supposed to be 10,500 lbs and you often see this weight quoted, the later literature and PHRF measurement certificates indicate that the stock Lancer 36 weighed 12,400 lbs with the same 4,000 lbs of ballast listed for earlier versions. In its original form, the prototype Lancer 36 was designed as a masthead rig. When it first hit production, it was offered with a fractional rig, but as far as I know very few of these fractionally rigged 36's were built. The design was altered back to a masthead rig with enorous headsails and a tiny mainsail. In masthead rig version, the Lancer 36's were optimized for reaching and running with huge spinnakers and also to do well under the rating system of that era, but are a slug upwind. These masthead rigged versions, when compared to other designs of that era or today, they were exceptionally hard boats to sail shorthanded. Lancer 36's also had one of the strangest interior layouts that I have ever encountered on a boat this size. While there may actually be a logic to this design for a couple living aboard at a marina in a cool climate, (or with AC added) for most folk I think it would be a difficult layout to live with. The ones I have been on also seemed poorly thrown together. Respectfully, Jeff  

Lancers are often underrated I know this is an old post to reply to, but these posts stay up indefinitely, and people continue to read them as a source of information. As the past owner of many sailboats, crew on many others, ex-racer, dinghy, catamaran & 49er sailor, and current Lancer 36 owner, I'd like to clear up some misconceptions about these boats. First of all, they are well-built, or the majority of them were. The marine surveyor who checked mine out at the time of purchase has been in the business for over 30 years. He lived near the Lancer factory, and has surveyed several dozen of these boats. He regularly surveys boats worth hundreds of thousands, and not infrequently, millions of dollars. He assured me that most Lancers are very well built, and that mine was a well-above average example in terms of its current condition. He winked and congratulated my on my judicious purchase - a bargain. As a case in point, my boat was moored at Semiahmoo Marina in the spring storm of 2006 that decimated Vancouver's Stanley park, with windspeeds exceeding 90 mph. Several boats in my marina had their hulls stove in - serious, BIG holes in the beam that I could literally have crawled through. My boat (I hadn't bought it yet) had its 135% Genoa unfurl and power up. The rocking action (waves on the beam) had kicked the fenders up onto the dock, and decent sized waves bashed the hull against the dock's wooden rub rail and a heavy horn cleat on the edge of the dock. Meanwhile, the Genoa heeled the boat against the dock even harder, until the sail finally shredded. Total damage? 1 headsail written off, minor cosmetic scratching to gelcoat - ZERO structural damage. Upon telling the marine surveyor this story, he highlighted that when he goes to survey hurricane damage for insurance companies, he almost never sees boats of this vintage on the scrap-heap. It's almost exclusively new, high-performance, modern construction boats that are holed in these storms. Make your own conclusions. The surveyor informed me that when Dick Valdez (Lancer's founder, previous founder of Columbia Yachts; a Plastics Engineer) sold Lancer to Bally, a NYSE, publicly traded company, they started a separate production facility that knocked out inexpensive small motor-sailors - McGregor competitors that didn't employ a lot of hand-laid roving, but did employ a lot of gun-blown chopped strand. These boats had a tendency to separate at the hull-deck joint under heavy loads, such as heavy air races. Different company, different boat, different production line and methods. But the upshot was this: Lancer's name was absolutely destroyed. The boating community at large reviled the brand, and this is reflected to this day across the brand lineup's resale value. My Lancer 36' is similar in build quality to its contemporary C&C or Catalina. There are some things I like better about either of these boats, and things I like better about the Lancer. It does indeed sail just fine to windward, contrary to popular belief. Tracks like an arrow, in fact, with very little leeway. That 4000 lb keel is also 6'2 feet underwater. This makes for a very stiff boat - if it had a foot less depth, for instance, it would take a lot more weight to give it as much stiffness, or righting moment. I often sail with more canvas up than newer cruising yachts, with a similar amount of heel and a lot more speed. I've spent time in high winds on a friend's 44' C&C; a 6x Vic-Maui veteran, and class winner. My boat performs much like a 36 foot version of his much larger vessel. Stiff, fast, easy to sail, confidence inspiring. Contrary to popular mythology, this boat points high for its vintage and has a well-balanced rig. I regularly single-hand my boat in 35 knots or more of wind. I'm as confidant on board my Lancer as I've been on the best boats of this vintage; very. Yes, it has lively fore and aft movement in short, steep waves. But I also regularly exceed hull speed. I often see +8.5 kts without a spinnaker up and very little fanfare. I have frequently seen 7.5 kts close-hauled, while towing a hard dinghy. Does this sound like a slug? Not to me. Close-hauled, I can apply a small amount of friction to the wheel, and nip below to grab something while the boat tracks as straight as an arrow. The traveler is well out of the cockpit, ahead of the companionway hatch and dodger. I love this. I just don't understand where all of the criticism of these boats comes from, to be honest. I suppose, of course, if one wants to justify spending double the money for a similar boat… My guests come aboard and marvel at the spacious cabin and liberal use of high-quality teak. They instantly 'ooh and ahhh'. My fiancee loves the large head with shower and separate vanity, and walk-through access to the aft stateroom. I've had a family of 6 aboard (plus myself) on a multi-day trip with as much room for all as you'll find on any boat of this era and size - we were able to sit around the table and play board games in the evenings. I regularly take out 4 students for a week at a time, some of them experienced sailors and current boat owners -and you know what? They love the boat, and want one just like it. Yes, the layout is unconventional - oh my! But it works… Are there things I would change? Of course - boats are an exercise in compromise, and for every 5 things you like, you'll find one or two you don't. But just because it's different, doesn't mean it's not functional. Other notes: yes, it is a deck-stepped mast with a compression post. Deck integrity has to be there - any boat that leaks can wind up rotting out - this is important on every fibreglass boat out there. Don't buy a boat with soft decks unless you just absolutely love DIY projects. And make sure you pull out that compression post every 25 or 30 years or as needed to have it professionally acid etched and repainted to protect against corrosion. Yes, these boats need to be maintained, just like all of them, and the rigging kept ship-shape. Is there a sailboat where you wouldn't want to do that? I saw a lot of keel-stepped boats dis-masted this year at the Southern Straits race - too much canvas for the conditions (operator error). Don't use more canvas than your rig can handle. Want to race in storms? Buy a storm trysail and a storm jib. Deploy them before you need to. Don't run under a full main and Spinnaker in 40+ knots of wind while the Barometer is plummetting and windspeed is increasing, and you'll blow past the entire fleet with your hankerchiefs up, while they blow out their sails and find the top section of the masts sticking through their decks. Get it? While you're at it, if you want to race in serious conditions, buy proper harnesses and jacklines, and use them. Put large stainless steel backings on your hard points. Close your hatches companionway washboards when the going gets rough so you won't be swamped if you broach or get pooped by a following wave breaking into your cockpit. Be safe and be smart. But I digress. I brought aboard a friend who's all but stopped counting his global circumnavigations - he spent 9 years teaching offshore sailing while crossing the world's oceans with novice students aboard his custom-built, full-keeled boat. I commented that I wasn't sure my boat would be that great offshore. He didn't hesitate to reply that with the right preparation, he would sail my boat anywhere in the world; he's sailed from Vancouver, BC, to the North Sea via the Panama Canal in a boat nowhere near as capable or well-built. He reminded me not to listen to the opinions of boaters who haven't owned and seriously sailed the same boat. Hmmmm. Food for thought, indeed. No offence intended. So in summary; of course it isn't a year 2000+ design. It has to be measured against its contemporaries to come up with a fair evaluation of the boat's capabilities. Well-maintained examples compare favorably with other brands currently valued at double the price or more. So if you are a value-seeker, and are willing to do a little of your own homework to dig up some facts, and take a very deep look at the vessel you are considering purchasing, you may just find that a Lancer gives you great value for your dollar, in a package that is safe, fun, and raises more than a few eyebrows as you gracefully slide past more expensive boats of the same vintage (oh - and high-volume modern cruising boats that I wouldn't take out in serious weather). I have yet to bump into a Lancer owner (of one of their bigger boats) who wasn't delighted with his or her vessel. Good sailing to all of you!  

Lancer 36 I really enjoyed your post. It was interesting to understand where the nagative coments come from, the two different manufacturing standers. I have owned Redemption,Lancer 36 for almost 10 years now and still love sailing this wonderful boat. Sure their are complants, but this boat really sails well in all kinds of conditions. I may never sail her to Hawaii but I know we could do it and may do it one year. Brad s/v Redemption Channel Islands California  

There seems to be a bit of misinformation involving the Lancer 36, starting with the Trans Pac and including construction qualities. 'Chutzpah' which won the Trans Pac overall in 1973 and 1975 was a custom boat designed and built by Bill Lee. Chutzpah was one of the earliest ULDBs and weighed about 7500lbs and only shares a small family resemblance to a Lancer 36 which was designed by Lee based on Chutzpah but weighing substantially more and carrying much more interior furniture. Still, the Lancer 36 is , for a Cruiser/Racer designed in the early '70s, a fairly light boat that performs well under sail. Although the standard rig was intended to be optimized for reaching and running, the boats have a very large keel and sail upwind just fine. Lancer's less than stellar reputation stems from the fact that most of their product line was made up of power/sailers and some small trailerables, none of which sail well. All of the Lancer 36s I've seen appear to well built, with decent joinerwork below and gelcoat that still looks good after 30+ years on deck.  

I am also the owner of a 36 foot Lancer hull #99 built Dec 81. It was bought new buy my father and passed down to me 7 years ago. I keep it in Blain, WA. I love the boat and would never even consider selling it. Just had a full survey done, and it passed with flying colors. It sails beautifully and is very fast. 7.6 knots with 15 degrees of heel, into the wind. No weather helm. Can take my hands off the wheel and it tracks straight as an arrow. Everything in the previous post is bang on. Great boat, Love it, and would buy another one without hesitation !  

We own Brown Sugar, a Lancer 36 hull #21 built in 79' We bought it in 2013, The survey stated "Excellent condition, shows pride of ownership" And from Stockton CA, in 2014 we took it to Cabo San Lucas and back with many fun stops on the way there and made it back in 13 days with one lay day for alternator repair (Turtle Bay, Baja MX). ON the way their we were caught in the tail of Hurricane Vance and as we were "uncomfortable" all night in a pitch black sky, large sea's and us having our first major storm experience, the boat handled without any issues, on auto pilot and No damage to her. Easily sailed short handed or single. There are a lot of quality boats out there and Bill Lee with Bruce King designed a good one with the Lancer 36. Any boat should be regularly exercised and kept up on maintenance. Sailboats are safe in the harbor, but that's not what their made for.  

I own Lancer 36 Hull #127. We ordered the boat from Dick Valdez sitting in his office in Orange County in 1981 and took delivery in March, 1982. I have owned the boat ever since. The boat has been in San Francisco Bay since delivery and sailed in all types of conditions in this typically windy venue. I am a big fan of regular maintenance and the boat has been superb. We have replaced and upgraded equipment as we go but that is what you do as a long term owner. The Lancer build quality was overall pretty high - excellent gelcoat finish, good rigging and mechanics overall. The boat is a dream to sail and is comfortable for a family of 4 to stay aboard for a long weekend or more. It is a light boat for the SF Bay conditions but has never failed us and goes downwind like a Porsche - fast and tight. I have never raced my boat so the rating game doesn't interest me. I agree that it is an old design but nevertheless it has it's merits. BTW - the interior floor plan still gets rave reviews from my Guests, many of whom have newer and larger boats that still can't match the space down below on this model. It would be tough to find one that is still in good condition but if you do give it some serious consideration, especially for the money. They did get a bad rap in those years after Lancer Yachts failed but mostly that was based on some of their larger Power/Sail models, those boats didn't sail well at all and performed marginally under power to boot. The 36, using the old Chutzpah hull mold, was really their best sailboat in the line.  

Re: Lancers are often underrated I have owned a 1981 Lancer 36 for nine years now and have grown to love the boat. I sail her more than anyone else I know in our large marina - all seasons and (nearly) all weathers. The negative comments above sound like they belong to a totally different boat. Mine is built well, surveys well, points well and simply out-sails much larger sailboats again and again. Apart from all of that she is darn pretty to look at! Another Jeff.  

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• Sailboat Guide

Rival 32 is a 31 ′ 9 ″ / 9.7 m monohull sailboat designed by Peter Brett and built by Marine Construction Ltd. starting in 1971.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

All 200 hulls were molded by Marine Construction Ltd., but many were finished by Southern Boatbuilding. The design was a longer counter sterned development of the 1967 designed Rival 31, and later evolved into the better-known Rival 34 - although actually more Rival 32s than 34s were built.

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The Rival 31 is a 31.0ft masthead sloop designed by Peter Brett and built in fiberglass by Marine Construction Ltd. (UK) since 1969.

30 units have been built..

The Rival 31 is a heavy sailboat which is a very high performer. It is very stable / stiff and has an excellent righting capability if capsized. It is best suited as a cruiser racer. There is a very short water supply range.

Rival 31 for sale elsewhere on the web:

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