rc 27 catamaran

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• Sailboat Guide

RC-27 is a 27 ′ 5 ″ / 8.4 m catamaran sailboat designed by Bill Roberts and built by Aquarius Sail Inc. starting in 1984.

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)

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• About Sailboat Guide

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7 Super-Fast RC Catamaran Boats

Catamarans—cats for short—are the type of boat you either love or have little interest in. This guide is for the former. An RC catamaran is a multihulled vessel with dual parallel hulls. With sailing cats, there are at least two beams that connect the hulls, with a mast on one of them. The absence of a keel lets the boats sail or race in shallow waters. That means they get to go where other models can’t.

The Catamaran’s unique design is not only for riding the shallows. It also makes the boats a lot wider, more stable, and faster than conventional monohull crafts.

• Radio Controlled Catamarans

R/C catamarans are miniature versions of real boats. Most models are ultra-fast speedboats that achieve plane quicker than other vessel types. Hobbyists love to race them because of their pace on the water and aggressive turning ability. The downside to cats is that they’re not at home on choppier waters, and are more vulnerable to turnovers. Consider an RC cat for smooth water, sporty fun.

• RC Catamaran Buying Considerations

The price between models can vary a lot, so set a maximum budget before you do anything. Knowing your budget narrows down the search to only those within your price range.

Here’s a quick breakdown of buying considerations for those new to RC.

• Gas vs. electric
• Motor choices
• Running time
• Charging time
• Useful features
• Gas Vs. Electric Power

Opt for an electric cat if you’re new to the world of RC boats. They’re cleaner, easier to maintain and still have plenty of oomph on the water. Gas-powered cats are for experienced hobbyists. They’re for people who love the realistic experience provided by liquid fuels. But they’re also dirtier, need periodic oil changes, engine tune-ups, and regular maintenance.

• Speed Considerations

Speed is half the fun, but the faster the boat, the more space and skills one needs to control it. Some models have variable speeds, whereas others are plain fast from the off. Think about where you intend to use the boat. High speed is not your friend with small bodies of water such as pools and tiny ponds. Novice users should opt for a slower cat or one with variable speeds and precise throttle manipulation.

• Motor Choices

Electric-powered catamarans use brushed or brushless motors. The brushed options are the cheapest of the two. They are also slower and have a shorter life expectancy than their brushless counterparts. Brushless is the best option because they pack more power, are quieter, and require no maintenance. Most agree that the higher cost of a brushless power system is justifiable.

• Running & Charging Times

The time an RC cat runs on a single charge depends on how hard you push it and the battery used. Running times vary between models and can range from single digits to 30+ minutes. There are two other things to consider here. One is the charging time and the other is the cost of extra batteries. I include the battery and charging times in each of the reviews.

• Control Range

The control range is how far the boat can travel from its transmitter. Make sure the distance is acceptable for your needs. Likewise, it’s not necessary to have a range that goes further than the line of sight (LOS). If that happens, and you lose power or the signal, you may not be able to recover the boat. Some models come with low-battery and low-signal warning indicators.

The range also depends on the radio system used and other factors. The control distance is acceptable with all the models featured in this review guide.

• Useful Features

Make a list of what features are important to you. Consider the boat’s materials, especially its hull. Others might be a breakaway rudder system, low battery protection, and a self-righting function. Make a note of the dimensions too. Beginners often buy a model that’s either smaller or bigger than they thought. Also, heed the manufacturer’s recommended age if you’re buy the boat as a surprise gift.

• About My ‘RC Catamaran’ Guide

The purpose of this simple guide is to put all the jumbled seller’s spiel into plain English. These short reviews highlight the boats good and not so good features—if any. There’s also a tech specs column that gives details of the specifics mentioned above.

The 7 RC catamarans below are the result of personal research. I also took the views of industry experts into consideration, along with user feedback. The first three are the Editor’s choice for Best Budget, Best Value, and the Top Pick. The cats below those are in price order for convenience.

• RC Catamarans Comparison Table
• 1. Pro Boat 17” Miss Geico RC Cat | Best Budget

Editor’s Rating: 4.2/5

Pro Boat‘s 7” Miss Geico is a fun RC catamaran. It’s a fully ready to run (RTR) model that comes complete with a battery and wall charger. It’s a fun boat and an excellent first-time cat.

• Best feature 1: Durable blow-molded ABS hull
• Best feature 2: Dynamite 380-size motor
• Plus points: RTR model, excellent first-time cat, streamlined design, breakaway rudder,
• Minus points: Slow for a cat, short run time
• Miss Geico RC Catamaran Highlights

The Miss Geico RC cat has a durable, rigid, impact-resistant ABS hull. A powerful 380 motor system provides the boat with plenty of torque for a model in its class. Consider this vessel as a first catamaran, especially if it’s a gift for younger children. It makes an excellent trainer craft with its precise throttle manipulation and easy-to-use controls.

The streamlined design and bright yellow color offer more than just an eye-catching appeal. It also gives the Miss Geico high visibility on the water. Another feature worth a mention is the breakaway rudder system. That helps to protect the drivetrain should the boat hit ground.

• The Not So Good

At 12–15 mph, the 17” Miss Geico is not a super-fast catamaran, but then it doesn’t claim to be. The run time with the supplied battery only lasts about 10–15 minutes at best. That’s quite typical for this category, but disappointing nonetheless.

View on Amazon

• 2. Aquacraft Wildcat EP Catamaran | Best Value

Editor’s Rating: 4.8/5

The Best Value pick goes to Aquacraft’s Wildcat EP brushless catamaran. This boat is a step up from the beginner-friendly model above. Let’s check out some of its best features.

• Best feature 1: Molded ABS hull w/ transom drain plug
• Best feature 2: Powerful 35-36-1800Kv brushless outrunner motor
• Plus points: Tactic Tx, striking graphics, breakaway rudder, failsafe features, boat stand
• Minus points: Too fast for beginners, no battery included
• Wildcat EP Catamaran Highlights

The Aquacraft Wildcat EP catamaran is everything you’d expect from a model in its category. The boat has striking graphics and a beautiful streamlined molded ABS hull complete with a transom drain plug. A powerful brushless 35-36-1800Kv outrunner motor propels this cat to speeds exceeding 40 mph (64 km/h). Control is easy and interference-free thanks to the TTX300 SLT Tactic radio system.

• Safe & Secure

There are plenty of safety and protection features with the Wildcat EP Catamaran, namely:

• Water-cooled brushless controller w/ low-voltage cutoff
• Break-away rudder system
• Steering & throttle reverse/trims
• Two-blade fiber-reinforced plastic propeller

Adrenaline fans won’t be disappointed with the speed and handling of this cat. It’s super stable on the water even when it’s choppy. It may fall slightly short for expert users, but it’s an excellent second boat for those at the intermediate level. There’s also a stand for safe storing out of the water.

The Wildcat EP catamaran may temp beginners though it’s too fast for novice users. It has superb handling, but driving at high speeds still takes skill. The model doesn’t include a battery, so you need to add at least 15 dollars to the price or more if you want spares.

• 3. RTR Gas-Powered Zelos G Catamaran | Top Pick

Editor’s Rating: 4.4/5

Pro Boat gets the Top Pick with it’s incredible gas-powered Zelos 48” catamaran. We’re in the big league now. It’s the kind of model that beginners and intermediate enthusiasts aspire to.

• Best feature 1: Wide, triple layered fiberglass hull
• Best feature 2: Sturdy canopy w/ thumb screw fasteners
• Plus points: Powerful 30cc engine, water cooling, metal prop, centrifugal clutch, boat stand
• Minus points: Needs experience and maintenance skills
• Zelos G Catamaran Highlights

The Zelos™ 48 Type G Catamaran is a gorgeous boat. It has a classic sporty look with a striking trim finish. That makes it an attractive display model when it’s out of the water (stand included). And it’s well-protected against brutal crashes thanks to the extra layers of reinforced fiberglass.

• The Zelos G Power System

This powerful high-speed boat springs to life when it’s on the water. Expect speeds of 50+ mph (80+ km/h) from its gas-powered 30cc Dynamite® Zenoah G300PUM engine. It starts effortlessly too with the EZ Starting System, so no pulling needed. The boat has a 3-blade metal prop that’s durable and long-lasting. It’s also possible to sharpen and balance the prop to improve performance further.

The metal propeller won’t spin when the engine is idle thanks to the centrifugal clutch. This safety feature protects hands and fingers when moving the boat in and out of the water. Surprisingly, not all big boats include a centrifugal clutch. Also, the propeller strut has anodizing to protect it in harsh conditions, and that includes salt water.

Another feature to mention is the water-cooling system. It uses water pickups on the bottom of the hull and the boat’s rudder. They work by feeding water to the cat’s engine and its tuned exhaust. Keeping operating temperatures down is vital for safe and optimal operation.

• Spektrum™ DX2E Transmitter

The Zelos G Catamaran comes with a Spektrum™ DX2E transmitter. It’s a quality controller with adjustable endpoints and an extended range. It also includes a built-in lost signal fail-safe feature for added protection. The radio system uses a waterproof Spektrum MR4000 receiver.

This boat is not for the faint-hearted, and it’s not suitable for novice users. The engine must be broken in first. Although that’s not difficult, problems do arise out of impatience and ignorance. Engines—unlike electric power—need maintenance and tweaking to perfection. There are safety issues to consider as well. These things are only negatives for the inexperienced RC boater.

• 4. Pro Boat RTR Blackjack 24” Brushless RC Cat

Editor’s Rating: 4.3/5

This RC fast cat is the ready to run (RTR) RC Blackjack 24” brushless catamaran. It’s a fun boat for use on ponds and lakes that leaves plenty of waves in its wake.

• Best feature 1: Ready to run (RTR) catamaran
• Best feature 2: Powerful 2000Kv brushless water-cooled motor
• Plus points: Off-set rudder system, 1-piece electronics tray, waterproof electronics, drain plug
• Minus points: Potentially loose parts, short running time
• Pro Boat 24” Blackjack Highlights

Pro Boat’s lightweight RTR 24” Blackjack is ready to go right out of its box. Its blood red paint job and streamline design give it an eye-catching appearance. It can pack a punch on the water too, capable of top speeds around 30 mph (48 km/h). The power comes from a water-cooled 2000Kv brushless motor and 30A LiPo compatible ESC. Blackjack’s 2.4GHz radio system is a Spektrum™ STX FHSS.

An off-set high-strength rudder system provides the boat with outstanding stability on the water. The Blackjack has waterproof electronics and a convenient one-piece electronics tray. Other feature highlights include a handy drain plug and a waterproof hull-mounted steering servo.

This catamaran is ready to run (RTR), but there are some reports of loose parts. New users should always check for any looseness with this and any RC boat before running it. The other, more predictable con, is the short running time. How long you get depends on the battery (not included). Even so, the boat’s unlikely to go for much more than 10 minutes on a single charge.

• 5. Rage RTR RC B1207 Super Catamaran Boat

Editor’s Rating: 4.6/5

This model is the Rage RC B1207 Super Catamaran. It’s a 100% factory assembled ready to run (RTR) RC SuperCat. The model comes equipped with a 2CH, 2.4GHz radio system.

• Best feature 1: Durable unibody ABS hull
• Best feature 2: Fully proportional throttle and steering control
• Plus points: Stainless steel parts, brushless power system, wooden display stand
• Minus points: Few reviews
• Rage B1207 Catamaran Highlights

The Rage RC B1207 SuperCat has a sleek design with an aggressive trim. It boasts a durable unibody ABS hull, stainless-steel propeller, and rudder. Users get plenty of adrenaline-pumping wave-making fun on the water too. Top speeds can reach up to 40 mph (64 km/h) in the right conditions.

High performance and smooth handling add further to the SuperCat’s appeal. We have the 2000kV water-cooled brushless motor and 40A water-cooled ESC to thank for that. And the boat’s fully proportional throttle and steering control keep you firmly in the driving seat. Some call it the water rocket, and it’s a deserved nickname too. Check out some of the video demonstrations.

This model doesn’t have much real user feedback at the time of writing. Many less experienced buyers rely on owner reviews as part of the decision-making process. Veteran RC boaters are in a better position to make informed choices based on personal experience.

• 6. Pro Boat UL-19 Brushless Fast Hydroplane Cat

Editor’s Rating: 4.7/5

Another Pro Boat model gets the sixth slot. This time it’s the UL-19, a 30 inch brushless hydroplane. OK, so it’s not a true cat, but its super-fast performance and airfoil hull are sure to interest some.

• Best feature 1: Lightweight, durable design with vertical fins
• Best feature 2: Brushless power system
• Plus points: Hand-laid fiberglass, breakaway rudder, Spektrum™ 3KG servo, metal parts
• Minus points: Gets hot fast, short run time
• Pro Boat UL-19 Cat Highlights

You often read comments like adrenaline-pumping and heart-pounding, but in this case, it’s true. Pro Boat’s UL-19 is an incredible vessel that runs as fast as its sleek design suggests. This puppy can reach speeds up to 50+ mph on 6S power due to its 6 pole water-cooled motor and the 120A ESC. Drivers get to experience fast, confident cornering thanks to the waterproof Spektrum™ 3KG servo.

The UL-19 hydroplane is a lightweight yet stable boat on the water. The boat’s canopy and hull use hand-laid fiberglass in the build for added strength. It has removable/replaceable vertical fins and a breakaway rudder. The model also uses metal for its vital components. They include the aluminum rudder, stainless steel 2-blade prop, aluminum propeller strut, and a stainless-steel turn fin.

The electronics tend to get overly hot even at slower speeds. You’d expect that with flat-out racing for long durations, but not at half throttle. Yes, the Pro Boat UL-19 can run on a 6S battery setup, but it won’t serve you well in the longer term. Ideally, the 2-3S 5000mAh 50C LiPo is certain to increase component life. Running time depends on the setup, but it’s going to be in single digits in all cases.

• 7. Traxxas Red DCB M41 Brushless Catamaran

Editor’s Rating: 4.5/5

Meet the Traxxas Red DCB M41. It’s a powerful brushless catamaran capable of reaching speeds up to 50 mph (80 km/h) on 6S power. The designer of this beauty is DCB or Dave’s Custom Boats.

• Best feature 1: Wide physique catamaran
• Best feature 2: Precision sculpted 1350 Mercury racing engines
• Plus points: Ultra-fast, versatile, low voltage safety, adjustable battery trays, electronics tray
• Minus points: Needs upgrades for optimal performance, high price tag
• Traxxas Red DCB M41 Cat Highlights

The Traxxas Red DCB M41 twin hull catamaran is a beast outdoors that’s fast and versatile. It’s a stable performer too whether it’s racing across waves or smoother water. The included advanced TQi receiver, and 2.4GHz transmitter allows captains to fine-tune their boat. The incredible power comes from a pair of precision sculpted 1350 Mercury racing engines.

Let’s look at some of the other feature highlights. The adjustable battery trays with hook-and-loop straps are useful. You can adapt them to use with various Traxxas LiPo or NiMH batteries. The cat is compatible for use with 6S LiPos with integral low-voltage detection. There’s a removable electronics tray and a waterproof receiver box that are easy to access for maintenance.

It’s a beautiful boat and a great performer, but it does need upgrades for optimal performance. The stock cooling is one, and the stock plastic props don’t hold out too well either. Some users complain about the thin plastic hull as well. Despite that, I haven’t come across any reports of the hull breaking up. The cost of a Traxxas Red DCB M41 is quite high, but most fans think it offers excellent value.

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design of a fast 27 catamaran

Discussion in ' Multihulls ' started by SAILFASTtigre , Apr 18, 2005 .

SAILFASTtigre Junior Member

Hi everybody. i am designing a 27 foot sail catamaran to sail steady trade winds, long ocean swells. I have completed preliminary hull lines, and the hydrostatics for one hull are: Displacement 1 tonne Volume 34.44 ft^3 Draft to Baseline 1ft 4.99in ft Immersed depth 1ft 1.05in ft Lwl 26ft 11.92in ft Beam wl 2ft 10.01in ft WSA 78.41 ft^2 Max cross sect area 2.01 ft^2 Waterplane area 58.25 ft^2 Cp 0.634 Cb 0.414 Cm 0.696 Cwp 0.761 LCB from zero pt -8.67in ft LCF from zero pt -1ft 11.3in ft KB 1ft 0.57in ft KG 1ft 4.99in ft BMt 10.15in ft BMl 75ft 2.45in ft GMt 5.74in ft GMl 74ft 10.03in ft KMt 1ft 10.72in ft KMl 76ft 3.01in ft Immersion (TPi) 0.141 tonne/in MTi 0.221 tonne.ft RM at 1deg = GMt.Disp.sin(1) 0.01 tonne.ft Can somebody comment on these? I will be glad to share the computer file design with anybody willing to collaborate, best regards to all, david  

oldsailor Junior Member

I see your hull L/B ratio is 9.5 :1, which is a good fineness ratio for a cruising mulltihull, but what is your beam overall. For the waters you are considering sailing in it should be 15' wide, or approx 12' wide on hull centrelines. Cheers. Oldsailor.  

right. i was looking for a commentary on the hull hydrostatics. what about the LCB and LCF? would you like to check a 3d cad image? regards, david  

SORRY DAVID. I am not "UP" on hydrostatics, but if your are able to post a 3 view of your design I would be happy to see it. Cheers. Oldsailor.  

sharpii2 Senior Member

Hi S.F.tigre. Being a graduate of THE LANDING SCHOOL I am embarassed to admit I know what only half those numbers mean. What I think would be helpful is a list of design objectives. Such as: a.) intended use. Is it a huge daysailer? A weekend cruiser? or is it expected to cross an ocean? b.) payload expectations. How much do you want it to be able to safely carry? c.) performance expectations. From your handle, I'll asume you want it to be as fast as possible. But there is always a price for speed. d.) budget limitations. Even the richest man in the world has to live on some kind of budget. (maybe by successfully doing so in the past is why he is so rich.) And these are only the ones I can think of off hand. As you can see, they all relate to one another. During my final months at the school, we were to do our 'final project'. With in certain limits, of course, we were allowed to design to our heart's content. One other conditon was that we were to write a brief summery on what the design was to be about along with a freehand sketch. I handed in a bunch of numbers that were mostly about the dimensions of my new boat. It was to be based on a famous American workboat called a 'cowhorn'. It was to be over 42ft long. A day later, my summery was returned with what in effect said 'unacceptable' written on it. I couldn't figure what the old guy wanted, so I asked him. My next summery was over three pages long. It started out with a simple purpose, to cross a great ocean. Then the 'conditions' multiplied like rabbits. The new boat I sketched was almost eight feet shorter than the original and slightly less than 60% its displacement. And it handily met all of my objectives. That summery got a quick green light, along with a wink, from the old guy. Let me suggest that you make up such a list. Make it as short as you can but as long as you have to. And put the things you care about the most at the top of the list. In the design process a lot of things on the list are often going to end up being abandoned, so its a good idea make sure those things are not the things you really want. Just for the fun of it, why don't you post this list so everybody can compare it with the numbers you have already posted. Good luck on your project. Bob  

design objectives 27' cat Right Bob, thanks for your reply, there you go: Island hoper, dismountable –avoid marina and insurance expenses, hurricanes-, fun –I mean fast-, but able to deal with 6-8 long swells –not steep-, 20-30 knots. Trailerable, meaning after dismounting three cross beams –standard aluminum extrusions-. Three people needed. Can be shipped in specially purposed built crate and or 40’ container –perhaps mast has to be spliced.- Fast, so light, -wood composite or foam but vinylester to keep it cheap- round sections at the sterns with lightly swept up buttocks, fine bow sections. Prindle, f-18, … shape but a little more conservative-for weight carrying, without creating under wing wave resistance. – weight/performance compromise - High cross beams, meaning not necessarily in the same plane as the deck, bit higher. Cutter rig with furlers –only profurl-, full batten main with lazy jacks and reefing system –harken style-, for easy single handling. Water proof vhf and chart plotter, for Safe Island hopping. Able to fly a hull upwind or reaching for performance, but only enough to clear the water, no risking it here, mainsheet in hand… meaning also one hull supports full displacement. No living quarters. Only storage. Maybe a bunk without standing headroom and a small copkit with swept up deck for boat handling in bad weather. Open deck, trampoline, maybe a small deck part in center, between the two cross beams. At anchorage boom can be used as a support for tent or sun cover. Electric Autopilot –piston-, simple steering, beach cat style. No crossing oceans here people… No engine –maybe a small long leg outboard -, small battery bank for lights and instruments charged with solar panel or air marine wind generator. Small flexible 2 water tanks –maybe connected, hand pump transfer for water ballast. Barbecue on stern, fishing poles racks and a small bikini in aluminum tube. Dagger boards for upwind performance and kick up rudder for beach landing or unseen reefs, uppssssss. Surfboard or windsurf rack somewhere. $40,000 total construction cost max, loaded. That is a guess. Payload, about half ton.  

SORRY DAVID. I don't want to rain on your parade, but you have just described the Malcolm Tennant "Great Barrier Express". It's a bit like re-inventing the wheel. Go to Google and enter Great Barrier Express and you will see what I mean. I have the plans, patterns and photos of this design but have never got around to building it, and now AGE has got in the way. Over the last twenty years it has proved to be the ideal Cat for fast cruising, racing and inter-island hopping. Cheers. Oldsailor.  

great barrier express nice boat, I have seen before in multihulls magazine. There are many boats of this type, check the list at the end, cats 26-29. Includes the barrier reef. i personally like more the corneel 26 -see fotos in: http://www.multisailing.com/imag/2387bCorneel%2026%20Love%20Sirenien/page_01.htm or perhaps the firefly http://www.firebirdcat.com/ I would centarly like to have a look at those plans. Boat LOA BOA SA Displ Design/Mfg Heavenly Twins 26'00 13'09 340.00 6000.00 Heavenly Cruising Jet 26 26'00 15'05 300.00 992.00 Halacre, Douglas Leocat 26 26'00 19'00 420.00 1700.00 Kelsall, Derek Max 26 Micro 26'00 16'00 430.00 1128.00 Spruit Performance My-Cat 26'00 16'03 477.00 1322.00 Oudrup/Havkat/Micro-Boats, Pahi 26TR 26'00 12'09 300.00 1200.00 Wharram, James Scamper 26 26'00 14'03 300.00 1984.00 Prout Catamarans Tiki 26TR 26'00 15'01 285.00 1400.00 Wharram, James Tikiroa (Pahi 26)TR 26'00 12'09 300.00 1500.00 Wharram, James Trail 26TR 26'00 n/a n/a n/a Kelsall, Derek Tri-Star Cat 26 26'00 14'00 375.00 2800.00 Horstman, Edward Week End 8 26'00 14'03 n/a n/a Multi Difusion Week End 27 26'00 14'03 n/a n/a Bord'Ocean X-Kat 26 26'00 16'04 409.00 3400.00 Kelsall Catamarans Jeffcat 26 26'01 15'09 409.00 1322.00 Lerouge, Erik Nova Cat 26 26'01 16'05 377.00 1323.00 Nova Cat Zoum 80R Trailer Cat 26'01 14'09 334.00 2866.00 Novation Marine Aquilon 800 26'02 14'09 n/a 1875.00 Staneck Marine Campacat Sport 8 26'02 13'02 360.00 1800.00 Peter Brady & Assoc. Clyde Cats Micro 26'02 20'03 470.00 3600.00 Shuttleworth, John Dimanche 26'02 16'03 484.00 1545.00 Langevin, Sylvestre Edel Cat 26TR 26'02 13'01 323.00 1102.00 Langevin/Edel Cat Kat 26 26'02 12'00 363.00 3200.00 Kelsall, Derek Andarin 26'03 16'05 388.00 1543.00 Vollmer, Alfred Brady 08.0 26'03 14'00 322.00 3236.00 Peter Brady & Assoc. Catman 26 26'03 17'00 506.00 1102.00 Lerouge, Erik Catman 27 Micro 26'03 16'05 506.00 1323.00 Lerouge/Catman SA Cheetah 26'03 20'00 470.00 1984.00 Clyde Cats Clyde Cats Lynx 26'03 17'03 453.00 1764.00 Shuttleworth/Clyde Cats Corneel 26 26'03 14'09 382.00 1543.00 Joubert-Nivelt/Fount. Pajot Falcon Supercat 26 26'03 19'05 n/a 1060.00 Southwell, Phil Firebird 26'03 17'03 338.00 1540.00 Smith, Martyn/Modular Moulding Format 26 26'03 16'05 431.00 2000.00 Peter, J. Format 26 t 26'03 16'05 431.00 2400.00 Peter, J. Lavranos 26 Micro Cat 26'03 n/a 527.00 1433.00 Lavranos, Angelo Micro 26'03 18'05 610.00 1400.00 Lerouge, Erik Micro Class Daysailer 26'03 16'05 463.00 1213.00 Simonis, Alexander Micro-Multihull 8m 26'03 19'06 515.00 1653.00 Shuttleworth, John Multi Mar 26 26'03 17'00 411.00 2400.00 Callahan, Stephen NixeTR 26'03 17'03 480.00 1800.00 Lerouge, Erik Pair of Twins 26'03 16'05 452.00 1875.00 Veenema, Harm Resonance 80 26'03 15'09 465.00 1102.00 Sass, Heinz-Jürgen Shttlewrth 8m Cr.TR 26'03 n/a n/a n/a Shuttleworth, John Shttlewrth 8m Rac.TR 26'03 n/a n/a n/a Shuttleworth, John Shttlewrth 8m R/CTR 26'03 n/a n/a n/a Shuttleworth, John Sirius 26 26'03 21'02 452.00 1720.00 Chantier Naval Force 3 Spyder Mk2 26'03 18'00 446.00 1100.00 Tennant, Malcolm Spyder 26'08 16'05 199.00 946.00 Tennant, Malcolm Backslash 26'09 15'09 499.00 2424.00 Simpson, Roger Stiletto 27TR 26'10 13'10 336.00 1150.00 Higgins, Bill Stiletto GTTR 26'10 13'10 352.00 1650.00 Wormwood, Peter Black Cat 27'00 15'00 350.00 5500.00 Manners, E. Catalac 8m 27'00 13'06 275.00 6283.00 Lack, Tom Get 27 27'00 n/a n/a n/a La Griffe Marine Heavenly Twins 27 27'00 13'09 390.00 6000.00 Heavenly Cruising Sun Burner 27 27'00 13'06 385.00 3500.00 Harris, Robert Tini 27TR 27'00 n/a n/a n/a Kelsall, Derek Tri-Star 27CT 27'00 21'00 552.00 1500.00 Horstman, Edward Tri-Star 27 PC 27'00 21'00 672.00 1900.00 Horstman, Edward Catamaran 27 27'01 18'00 313.00 1100.00 Kurt Hughes Sailing Designs Hughes 27 27'01 18'00 365.00 1100.00 Kurt Hughes Sailing Designs Tri-Star Cat 27 27'01 14'08 375.00 2800.00 Horstman, Edward Surfsong 27'02 17'01 377.00 3500.00 Woods Designs Havkat 27 C/R 27'03 14'10 360.00 2600.00 Oudrup, Lars Havkat 27 Racer 27'03 16'06 430.00 1540.00 Oudrup, Lars Simpson 8.3m 27'03 16'02 336.00 5225.00 Simpson, Roger Catlife 825 27'06 14'05 146.00 1433.00 Rifflart, Marc Louis RC-27TR 27'06 16'00 450.00 800.00 Roberts, Bill Mariposa 27'07 11'05 323.00 2425.00 Henriks-Catanautica Kat 28 27'08 16'08 484.00 1432.00 KL Composites Seawind 850 27'08 18'06 479.00 4800.00 Jutson, Scott/Seawind Catamarans Seawind 850 Resort 27'08 18'06 479.00 4800.00 Seawind Catamarans Viva 27 27'08 15'10 600.00 1750.00 Westerly/Houghtonob Catfly 850 27'09 14'05 460.00 4189.00 Rifflart, Marc Louis Great Barrier Expr. 27'09 16'05 410.00 2370.00 Tennant, Malcolm Catman F-28 27'10 17'05 387.00 1499.00 Lerouge/Catman SA Great Barr. Exp. MkIII 27'10 17'05 n/a 2374.00 Tennant/Pilkington Kata 28 27'10 16'06 484.00 1389.00 Lucas, Paul Diabolo 27'11 17'04 n/a n/a CN Force 3 Kat 28 Tonic 27'11 17'04 n/a n/a KL Composites KL 28 Standard 27'11 16'07 411.00 1500.00 KL Nautique Wildfire 27'11 n/a n/a n/a Tennant, Malcolm Baron Noir F-28 28'00 n/a n/a n/a Lerouge, Erik Cat 28 28'00 16'00 420.00 3500.00 Chris White Designs Catfisher 28 28'00 13'06 380.00 7600.00 American Catamaranob Crocodile F-28TR 28'00 17'07 689.00 1433.00 Nielsen, Niels Crowther 28 #228 28'00 18'00 412.00 4500.00 Crowther, Lock† Davey-y-Joan’s 28'00 14'00 400.00 4727.00 Crowther†/Calvert Firefly 850 28'00 18'02 489.00 2756.00 Pescott, Mark Fisher Cat 28 28'00 n/a n/a n/a JC Plaisance Formula 28TR 28'00 19'08 750.00 1300.00 Lerouge, Erik Formula 28 28'00 33'00 700.00 1350.00 Shuttleworth, John IMD 28 Folding CatTR 28'00 14'00 593.00 2700.00 Int'l Marine Dev./Morrelli & Melvin Myers Racer 28 28'00 16'00 400.00 1300.00 Myers, Hugo† Myers Sprint 28 28'00 14'00 400.00 1200.00 Myers, Hugo† Nimble 28.2 28'00 15'07 443.00 4299.00 M&M Boatbuilders Shttle. Speed Mach.TR 28'00 n/a n/a n/a Shuttleworth, John Sophisticat 28'00 15'00 360.00 8600.00 Cope, A.N.H. Tiki 28 Coastal 28'00 16'03 330.00 3000.00 Wharram, James Falke 8m 28'03 14'05 366.00 3527.00 Falke Katamarane Lagoon 28'03 21'04 n/a n/a Certa Resonance 86 28'03 16'09 538.00 n/a Sass, Heinz-Jürgen Tanenui 28'03 12'06 310.00 2000.00 Wharram, James Punch 8.50 28'04 16'00 n/a n/a Chantier Naval Force 3 Format 28 28'06 18'04 484.00 3200.00 Peter, J. Design #127 28'10 17'00 380.00 3500.00 Chris White Designs Shockwave 29 28'10 17'00 348.00 2500.00 Crowther, Lock† Coral Coast 29'00 15'06 420.00 2646.00 Turner, Ross/Jarcat Harrier 29'00 19'00 484.00 3500.00 Crowther†/Harrier Harrier 8.8m 29'00 19'00 484.00 2500.00 Bosun Boats Imp 29 29'00 n/a n/a n/a Bimini Catamarans Warrior 29 29'00 16'00 456.00 2000.00 Bartolone/Conser Windspeed 29 29'00 20'00 500.00 3500.00 Crowther, Lock† Catalac 9m 29'03 13'09 420.00 8000.00 Lack, Tom Stiletto 30 29'04 17'10 460.00 2100.00 Wormwood, Peter Suncat 30 29'04 18'00 510.00 5300.00 Kelsall, Derek Suncat Sport 30TR 29'04 18'00 510.00 4000.00 Kelsall, Derek Akka 29'06 16'00 418.00 4000.00 Woods Designs  

DaveB Senior Member

cad file Hi, Neat problem... Looks like you're using Maxsurf... can you post the cad file so that we can see the shape of what you're describin'? Cheers, Dave  

Peter Renew New Member

Hi Sail Fast t I'm confused about your LCB and LCF. I am taking these to mean lateral centre of Bouyancy & Floatation in which case -8.67in ft & -1ft 11.3in ft don't make much sense. Please could you clarify? For a speedster without accomodation I would have thought a length to breadth ratio of 12 plus would be more desirable. Also are you choosing vinylester over polyester for the longer curing and therefore laminating time?  

lcb and lcf being longitudinal, distance fron the center of the profile aftwards. never heard of lateral centers of bouyancy, I guess if the hull is simetrical centers of bouyancy would be in the centerline. Only distance to calculate is longitudinal.  

cat corneel 26 check this jpg.  

Attached Files:

Vue d 'ensemble.jpg.

jpg and igs files cat 27 I attached a couple of 3d renders and a iges file Designers agree that the semicircular section -in the stern hafl side- is the best comprmise between volume displaced and wetted area, meaning buoyancy and speed. To design a semicircular section using hull design software, you need to specify a three point surface, align at 90 and evenly spaced, with the weights set to one except the corner one, set to 0.7071. that would take care od the underwater semicircular section. Adding more points for the freeboard, hafly towards the deck, above waterline sections, would inflect a change in the semicircular underwater section, so my question goes, is there any other way to set the points so that you would need only one surface for the hull, or do we need to split into two surfaces and then bond them, to maintain semicircular section under water and flat or convex half way in the higher freeboard? On the other hand, small cats are very wet, and, spcecially reaching and surfing waves, they tend to pithpole, -if you ever sailed a hobbie 16 you know what i mean, -the banana shape did not help-. I wanted to introduce certain convexity and the upper sections of the bow freeboard, to reflect water when sailing and to gain bouyancy when things start getting ugly. My catana does this very well, with its bolbous bows ans convex upper bow sections. i have surfed -reaching to get speed, down the next wave to take advantage of the negative slope and the inertia- reaching 20.4 knots -gps- and the bow goes to the limit, but not beyond. Could this feature be incorporated into a smaller symetrical design? --catanas' are asymetric-. best regards to all, david  

cat 27 one hull.igs

C27 perspective 1.jpg, c27 perspective 2.jpg, c27 perspective 3.jpg, c27 profile rendered.jpg.

NICE LINES DAVID. I think for the nasty short wave formations which I remember in sailing around the West Indies the forward sections look too fine. To prevent a very wet boat, and to reduce the possibility of pitchpoling you need more flare in the bow, or a bulb at the bottom of the stem-----or both. Just my opinion from sailing lots of Cats in the 23' to 52' sizes. Cheers. Oldsailor.  

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new hydrostatics cat 27 -for one hull- That is why I was wondering about the LONGITUDINAL CENTER OF BOUYANCY, my first question, widening the bow sections will move the cente of bouyancy forward, and the center of gravity has to be aligned with this LCB for the boat to sit trim. LCG longitudinal center of gravity is calculated by measuring distances from a center point and weights of every component to find the center of the weight of the whole thing, including the hull and deck, and in these case crew, since it is big percentage of its displacement. that is why more time is spent in front of the spreadsheet calculating numbers than in front of the modeling software giving a shape to this numbers. You design around numeric parameters. Does anybody know an average for LCG in cats these type 26-28 -in % of LWL-? What about waterplane numbers? here are the hydrostatics of the above lines -one hull-, which are modified from the first ones: Displacement 1.13 tonne Volume 38.82 ft^3 Draft to Baseline 1ft 4.99in ft Immersed depth 1ft 5.85in ft Lwl 27ft ft Beam wl 2ft 6.23in ft WSA 85.84 ft^2 Max cross sect area 2.27 ft^2 Waterplane area 50 ft^2 Cp 0.633 Cb 0.384 Cm 0.705 Cwp 0.735 LCB from zero pt -2.16in ft LCF from zero pt -2ft 0.12in ft Immersion (TPi) 0.121 tonne/in  

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M41 Catamaran lets you select your battery and speed level!

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Ready-To-Race ® The Traxxas DCB M41 Widebody comes fully assembled with a TQi™ 2.4 GHz radio system, Velineon brushless power system, applied graphics, and detailed instructions. Traxxas backs the M41 and all of our products with industry-leading support that is second to none. A staff of skilled representatives is on-hand to answer your questions via phone, website, or e-mail. Unmatched parts support allows M41 to be serviced with parts and support from thousands of hobby dealers worldwide. Traxxas protects your investment with the Lifetime Electronics Warranty. Traxxas goes the extra mile to ensure that your RC experience is easy, fun, and fast!

MODEL 57046-4: Fully assembled, Ready-To-Race ® Catamaran, TQi™ 2.4 GHz radio system, Traxxas Stability Management,™ Velineon ® 540XL Brushless Motor, VXL-6s Marine ESC,  and factory-applied graphics.

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Catamarans are among the most stable RC boats you can drive. Pro Boat combines that stability with high power to create some of the fastest boats in our lineup!

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Catamaran RC Boats

The catamaran hulled-boats are the most stable and fastest in any line-up. Pro Boat has a great range of RC catamarans and they are all influenced by the fastest race boats that compete in the ‘Class One’ category of offshore powerboats. The full-sized catamarans have twin outboard engines boasting more that 1000hp and are able to reach speeds in excess of 160mph. With a little tuning, you would be amazed to know that some Pro Boat RC catamarans have reached speeds in excess of 100mph – and at a fraction of the cost!

The catamaran hull designs are noted for having less volume, lighter displacement and shallower draft – which means less of the boat is in the water compared to monohull boats. Affectionally referred to as ‘Cats,’ these boats have two parallel sponsons of equal size that run along the outer edges of the hull. The two sponsons combined have a smaller hydrodynamic resistance than a monohull and the wider stance on the water can reduce both heeling and wave-induced motion.

When setting up your Pro Boat RC catamaran you will often hear people referring to the boat ‘running too wet’ which basically means it isn’t getting out of the water enough. A catamaran is designed to almost sit on top of the water and if it is unable to lift itself out of the water then it will run slower and handle poorly.

The Pro Boat designers and engineers have been heavily influenced by the full-sized Class One race boats and that has created three very exciting RC catamarans for the main high-speed part of the Pro Boat range. Available in three hull-lengths from 24” to 42” these are also some of the biggest RC boats in the range.

Let’s start with the biggest, and that is the ample Blackjack 42” 8S brushless RC catamaran. This is large scale RC racing at its most fun! The Spektrum Marine 4685 4-Pole, water-cooled motor produces over 5hp and will ensure this big boat can reach speeds of over 55mph! Smart technology throughout, this boat looks a little intimidating at first but within minutes you’ll feel right at home and find yourself pushing harder and harder to get those truly exciting speeds. It has an impact-resistant polycarbonate hull with a clean moulded composite interior. This RC boat is simple to work on and a joy to use.

The Blackjack 42” has a little brother, and that’s the Blackjack 24”. This 24” brushless RC catamaran can run on 2S or 3S LiPo batteries, can hit 30mph and is a great introduction into the world of catamaran RC boats. The distinctive red trim has great visibility on the water and looks very stylish too. This Blackjack is certainly not a gamble – always bet on red.

Between the two Blackjack cats, we have the Veles. This 29” RC catamaran is a pocket rocket. The 2000KV motor can propel this boat to 50mph+ on 6S power. It has a hand-laid fibreglass composite hull that has a very dynamic design with sharp lines and aggressive angles. The Veles 29” RC catamaran is fast and fun, whether you’re a beginner or intermediate RC boater.

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Wildcat Brushless Catamaran RTR

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Let the Wildcat EP loose and watch it fly! An 1800kV outrunner brushless motor delivers speed and efficiency. There's also a water-cooled LiPo-compatible 50A brushless controller with low-voltage cutoff, a stutter bump and Deans Ultra Plug connector. A Tactic TTX300 SLT radio system provides first-class control, and a “break-away” rudder system swings back upon impact to prevent damage to the hull.

Key Features

• Hull: Molded ABS plastic with transom drain plug and preapplied graphics
• Motor: 35-36-1800Kv brushless outrunner
• Motor Mount: Water cooled aluminum with transom mounted water pickup
• Drive System: Surface drive propeller system with 1/8" (3.2mm) shaft
• Radio: Tactic SLT 2.4GHz TTX300 3-channel with fail safe, steering & throttle trim, servo reversing and steering rate adjustment, TR325 receiver
• Electronic Speed Control: 50A water coooled, LiPo compatible, low voltage compatible and star plug
• Propeller: Two blade 42mm diameter FRP (fiber reinforced plastic)
• Rudders: Two aluminum construction with breakaway shear bolt design
• AA Batteries: Four for transmitter
• LiPo Battery: 3S 11.1V at least 2000mAh
• Battery Charger: Compatible with selected battery
• LiPo Charging Sack and Shore Equipment
• (1) RTR Wildcat Catamaran with Motor, Radio, Steering Servo, ESC, Stand and Instruction Manual

Specifications

• Length: 26.5" (673mm)
• Overall: 29" (737mm)
• Beam: 9" (229mm)
• Height: 5.5" (140mm)
• Weight: 32oz (89grams) RTR w/o batteries
• KV Rating: 1800kv
• Operating Current: 3.8A, 8V/DC (without loading, 8V/DC)
• Input: 3-S LiPo battery
• Max Current: 55A/15S
• Shaft Diameter: 4mm
• Motor Resistance: 37 miliohms
• Dimension: 1.4x1.42" (35mmx36mm)
• Weight: 3.77oz (107g) ±.35oz (10g)
• Amps: 50 amp continuous
• Max Amps: 65A 10 sec
• Voltage Range: 9V-12.6V
• Motor Connectors: 4mm bullet (3)
• Battery Connector: Star
• Stutter Voltage: 9.7 volts
• LVC: 9 volts
• Wire Gauge: #14
• Max Output Power: 500 watts
• On-Resistance: 0.0015 ohms
• Operating Frequency: 8KHZ PWM, 16MHZ MCU
• Timing Angle: Auto

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