rc wing sail catamaran

• Vanquish 65
• Mini Maniac
• RG65 Appendages
• Maniac MK II
• IOM Appendages
• Marblehead Class
• Marblehead Appendages
• RT65 Ragnarok
• RT65R Armageddon
• RC65 Adrenaline
• ST65 Sowelu
• Mini40 / F48 Class
• Nightmare X
• Nightmare MK VIII
• MultiOne Class
• FireDragon 1000
• DIY Sail Winch
• Rig Building

Click the picture to get to the boat's page Sailboats Sailboats use the power of the wind acting on sails to propel the boat. Model sailboats are typically controlled via a multi-channel radio transmitter in the hands of the operator with a corresponding receiver in the boat. By changing the position of the two joysticks on the transmitter signals are sent over two separate channels on a single radio frequency (assigned to the individual boat/operator). On the boat, the radio receiver is connected to two battery powered electric motors or servos. Signals from the radio transmitter are interpreted by the radio receiver and translated into instructions to change the position of the servos. One servo controls the position of both main and jib sails together (allowing the sails to be trimmed), the other the position of the rudder (allowing the boat to be steered).

Sailing Monohulls Model sail boats are governed by the same ISAF (International Sailing Federation) Racing Rules of Sailing that are used for full sized crewed sailing boats (with the inclusion of Appendix E, that introduces special rules to govern the radio-controlled sport). There are four international classes of radio sailing boats recognized by the ISAF-Radio Sailing Division and several other international monohull classes: (from smallest to largest). - International RG65 RG65 are monohulls with maximum lenght of 650mm, three different rigs allowed with a maximum sail area 2250 cm² - International One Metre (IOM) The IOM class rules specify a monohull of maximum length 1000 mm, with maximum draught 420 mm. There is a minimum weight of 4000 g, which makes homebuilding of competitive boats possible. The IOM has three one-design rigs. To keep costs down, hull materials are restricted to either wood or glassfiber, while masts and booms are restricted to either aluminium or wood. - International Marblehead (M) Maximum length: 1290 mm. Maximum draught: ca 700 mm. Up to six rigs are allowed, the tallest being about 2200 mm. - International Ten Rater (10R) - International A Class (A), the largest of the international radio sailing classes.

Sailing Multihulls There are several multihull classes, one of the most popular multihull classes is the Mini40 class or F48 with 48inch maximum lenght and 48 inch maximum beam . Other classes are the 2m class, the new MultiOne 1metre class and the very new 65M multihull class . The 65M is a very exciting class with well sailing, small and easy to transport multihulls. Multihull classes from smallest to largest: - 65M Class In 2008 some multihullers on various bulletin boards discussed building RG65 sized multihulls. The 65M class evolved with no other rules than overall lenght not exceeding 650mm. First designs came up in 2009 by Siri, who let Ernst Zemann a multihull designer draw two different hulls and Dick Lemke who started a Trimaran and a Catamaran. Several new designs followed. The 65Ms sail well, are easy to be transported and inexpensive compared to larger multihulls. - 65M Class The class homepage is here , new boats can be registered here , selfbuilding plans can be downloaded on this site for free. - MultiOne Class Multihulls with 1m length, unfortunately the class Homepage is not accessible any more. - Mini40 Class Popular multihull class with boats not exceeding 1220mm in length and a maximum beam of 1220mm. - 2m Class Multihull class with boats not exceeding 2 metres in length with a maximum beam of 2 meters and a maximum mast height of 2,8 meters. There are no restrictions on sail area.

Radio controlled racing boats are designed for maximum speed and maneuverability. Various syles of racing include circuits of different shapes laid out on the water with buoys. The most common courses are the 1/6th mile oval that consists of 330' straight sections followed by 70' diameter turns. The International Model Power Boat Association (IMPBA) as well as the North American Model Boat Association (NAMBA) have specific rules and regulations to address the course, race rules, and formats. In addition to oval racing there are straight a way (SAW) racing. This is a contest to see how fast you can make the boat go in a straight line. Timed events are held where the boats need to go through a starting light and an ending light. The speed is calculated by the timed difference from start to stop vs the length between the lights. Again IMPBA and NAMBA rules apply. Some enthusiasts race in the sea controlling their craft from a pursuing boat known as a "chase boat". These courses will usually be a few miles long and the competition is judged against the clock to find the fastest in class. Within the various styles of racing there will be a number of classes depending upon engine size and type.

Rc Model Wing Catamaran

Introduction: Rc Model Wing Catamaran

Attachments

RC Wing Sail Catamaran

Description.

This is a Wing Sail Catamaran project that I started over 6 years ago after seeing the new AC 45s introduced to the America's Cup races. The model uses PVC sheet, Carbon Fiber tubing and 377 Dupont Mylar to "skin" the wings. The "Cookie Cutter" construction technique allows me to make quick inexspensive changes to the design without having to scrap a model and start over, everything is tweekable. Two Catamaran models are shown here, but I have created a total of four boats during design development, one of which only sailed once,and poorly. But that one sailing taught me alot, and I started another boat the next day. It's not all about finishing one boat, it's about developing a Platform that can evolve as you learn.

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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.

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• 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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Wing Masts, Rotating Rigs, and Solid Wing Sails

Discussion in ' Technology Discussions ' started by Dick Lemke , Aug 12, 2009 .

Dick Lemke Administrator

I agree with Claudio that we were moving off-topic in the AC120 Build thread, so with apologies to Ray for jumping too early, will start this one up witht he illustration I had from an article on sail evolution from soft to "hard wing". While I thought there was more information accompanying the drawings, it appears these just supported the article. I will now have to search further, as I believe this came from an article on solid (hard) "wing" development for the 18 Square Meter, and the C Class catamaran. (And now, also for the A Class catamarans). At one time, we were blessed with a poster who has gone on to be crew on the most currrent C Class cat champion from Toronto, Canada. On " Sailing Anarchy " he can be identifed by his handle of " Blunted " and the skipper posts under the name " Fredo " - but I will give " Blunted " a call to see if he would be willing to return to this forum and provide some technical insight into the Canadian championship boat. If you can't wait, you can visit Sailing Anarchy and search for "C Class" for a lengthy discussion and some great photos. Here is the illustration I was thinking about when I posted my reply to Gary a.k.a. " Dreamwakes ": PS - before posting on this thread, lets agree to terminology? 1. A foil shaped mast - is where the chord is only slightly longer than the width of the mast 2. A wing mast - is a foil shaped mast with a much longer chord, and which still requires/uses a soft sail. 3. A solid (hard) wing - is a complete structure which may be shaped similar to the wing of an aircraft, and while it may use a sof sail material, it is primarily of a lightweight structure covered by some form of covering, material or film. 4. A rotating mast/rig is one that if there is no tension on the mainsheets (or lines) it will weathervane into the direction of the true/apparent wind. 5. A swing rig - usually used on r/c boats, is a self supporting rig that controls the angle of attack of both the jib and main on a rotating structure. (not allowed in many classes) By understanding these basic definitions, I hope to prevent two different visions of topic discussion by a reader.  

Attached Files:

Here are some interesting (and som very technical) article links - the first two being (in my estimation) the best discussion and theory. Enjoy http://www.boatdesign.net/forums/sailboats/rotating-wing-mast-theoretical-discussion-14714.htm http://www.tspeer.com/Wingmasts/airfoils.html http://www.sailingcatamarans.com/rigs.htm http://www.sailmagazine.com/cclasscats/  

claudio Active Member

Caludio - one very popular (and International) monohull class is the International 10 Rater. They are one of the few (maybe only) large monohull classes to use the rotating mast concept, and I would guess that if they are here in the U.S. and in the U.K. - they must also be sailed by a few in your country. Boats are close to the same size as a Marblehead, so it may be worth looking into when you have time. Regards, Dick [/unquote] Hi Dick, I tranfer here your message. Yes I knows the 10R, very few in France. Time ago I was busy with special rudders equiped with adjustable foils and at that time I contacted Mark Gee aswell Mr. Grubisa of ISAF asking permission for the Class M. The answer was "no". 10R are too large for easy transportation and they lost interest for that reason. Some years ago , Mark wrote an article on the rotating mast on Model Yachting magazine n°138. Unfortunately this article do not says very much about the forestay and its attachment to the mast if is a fractional sail plan. I'm not so certain how many ball bearings has been used to compensate the compression load, if any. My actual design deal with these details. I'm expecting to receive soon the bearings, the idea is to use 2 bearing one on top of the other on both ends. Ciao Claudio Click to expand...

Hello Claudio - on my beach catamaran (5.5 meter) with an approximate 10 meter rotating mast (18 feet long hulls, with 30 foot mast) was accomplished very easily, and lasted on my boat from 1982 until I sold it in 2006! Basically it is a vertical stainless steel post with a nylon ball on top. It went through the front cross-beam, and there was a "cup" shape to fit the ball, located on the bottom of the mast base aluminum casting. The multihulls and probably the 10 Raters do NOT use a backstay. Only a forestay, and two side shrouds were used, allowing rotation up to about 75 degrees each side from centerline to windward. Masts "usually" have side bend controlled by diamond wires. As the mast rotates, it is allowed to bend sideways, which pulls the luff in middle of sail forward and effectively does an automatic flattening of the mainsail. A set of loose diamond wires allowed mast bend, and a flat sail depowering in heavy winds and if diamond wires are tight to prevent mast bend, the mainsail stayed full and very powerful for sailing though waves. The skipper only had to have diamonds adjusted to on-water wind conditions, and the mast was also fitted with a rotation limiter, to prevent mast from over rotating - and for keeping it at the proper attack angle for the sail shape. The fullness of the sails were easily adjusted on the water and for different points of sail - mast bend to flatten sails, downhaul to move maximum camber forward, and outhaul to add camber for downwind reaching. The mainsheet tension on the rear of the boom controlled leech tension. Very sophisticated, yet simple. EDIT - ADDED Photo of Mast base "cup" and rotation limiter (color) and drawing of cross-beam with mast post and ball and how mast base fits on top of ball. Pin shown is a retained to keep base on ball as mast is raised or lowered.  

1-Mast Base.jpg

Mast post.jpg, earl boebert administrator.

Here's L. Francis Herreshoff's patent for the wing mast on his masterpiece "Live Yankee." This was an R Class boat (same rule as the J's, but smaller) and it killed the class in Marblehead, being the most expensive and fastest R ever made. It came out in 1927, but he was designing wing masts as early as 1924. It was the national champion as late as 1935, and of course the New York Yacht Club banned "rotating masts, double luff sails, and such contrivances" as soon as they got wind of what it would do. The boat was full of innovations, including a hull built of formers and stringers like an airplane fuselage a rudder that bent like a fish fin rather than rotating on a pivot. Cheers, Earl  

LiveYankeePatent.pdf

Earl - he was sure the "innovator". Wonder where we would be if the "stuffed shirts" would have left him to his design ideas and let him demo them in a practical manner - rather than just "killing' them? Do you have any links to his many patents? Would be great reading. Dick  

Dreamwakes New Member

Ok, thankyou Dick for taking this thread up. My main area of interest was in the fixed mast and the advantages/ disadvantages in choosing round or foil shaped sections..I am sure there is trade offs in either option and the aerodynamic variances would have alot to do with the method of actually attaching main sail to mast. From the info presented thus far, I read that unless your foil section mast is rotating then you are better off with a round section. . Which brings me to the conclusion that there are gains to be made with a foil section but because of the technical problems with building a rotating mast with fractional rig then the logical step would be a swing rig with foil section mast..the best of all worlds and simple. Unless, you could develop an idea of a semi ( and free)rotating fractional rig with foil section mast. I have owned beach cats with semi rotating masts and understand the simplicity as you described in your own beach cats but in the Rc world where ultra fine tuning does matter as well as weight and engineering complications , then I cannot for the life of me think up a easy method of building a effective semi rotating fractional rig. Claudio, interesting that you are looking at the bearing idea, i had given this method some thought and considered it the only idea that could succeed, but I did feel bearings would create a set of problems..compression, environmental degradation, light wind effectiveness..etc..I look forward to seeing how you progress with this concept. Cheers Gary  

Ahh, the bearing idea. Well, it was some time ago, I think around 2000 or so, I think the second Mystic Seaport RC regatta, there was this guy, I don't remember his name, from Newport RI, at the time he was working there as a sail maker/boat builder (big boats) (he was making 10R/M keel from broken CF mast spreader pieces .... something so stiff it was unbelievable), anyway, that year he brought an IOM and USOM he build, the USOM had a rotating rig, the mast was fixed per rules but he incorporated two bearing, one at the top of the mast and one at the bottom and made it so that the rig was rotating around the the fixed mast. If I remember correctly Jim Linville, the USOM secretary, found nothing illegal with it (the mast was in fact fixed). The rig was technically not fractional, it had a head stay jib, but the whole contraption was working fine, a little top heavy, but functional. We sailed the boat, but the hull had problems, it was a skiff design and when it was healing water was coming in, it had a really strange shape. The next year he brought a wonderfully wooden build 10R with this incredibly stiff keel, no deflection at all, and he said that he did not do much more on the USOM..... unfortunately he did not had internet (or a computer for that matter) and problems with the land line (apparently none), and the year after he did not show up....... This just to say that it has bee done before.  

Hi All, obviously what is done on real boat is no evident that can be done on models. Here where I am : Starting point = developping a rotating mast for the AC33 .................................... my problem is the forestay attachment ! ............. the principle retained : ................ ........ 140g for 180x4x0.75 cm so far.......... Last sketch ...................... This is my contribution to the tread ! Any ideas ? cheers Claudio  

Another source for wing "mast" theory/use is the world of landsailing. While many are wing "masts" there are also a few that are solid wings. It is truly unfortunate that my good friend Bill Korsgard has passed on, as he was an avid big boat sailor, ice boat sailor, and also a landyacht sailor. One might do a search on this site for some of his mast/sail combinations for some of his land sailing creations. In his absence, here is a link: http://www.ircssa.org/ And heck - if it works on wheel or on runners - give it a try...... although keep in mind that most are used on boats that "Create" their own apparent wind.  

smStory Build 1.jpg

P1160008.jpg, nautibuoy new member.

Well, been a bit occupied fixing a computer hardware issue but now that's fixed I guess I should pitch in.... I'm working on plans for both wingmasts and wingsails as experiments but my thinking is further along on the former so I'll stick with that for now. I'm basing my wingmast on the paper by Thomas Speer: http://www.tspeer.com/Wingmasts/teardropPaper.pdf The paper, at least to me, presents an understandable synopsis and suggests a practical approach to designing and building a wingmast. Ray  

To me the key to getting maximum benefit from a wingmast is to treat the mast/sail as an aerofoil, optimised for the air velocities that we operate in, i.e. low speed. So if we treat the mast/sail assembly as a single aerofoil it follows that we should try to keep the flow on the 'top' of the aerofoil as smooth and continuous as possible in order to maximise the 'lift' and not introduce drag. The paper I mention previously has some good info on this. Masts that are aero shaped and fixed fore and aft are, IMO, less effective than a round mast with a pocket luff or ring attachment, where the sail can rotate and to some degree approximate to a smooth aerofoil. rotating aero masts are better but if used with a conventional luff chord will be compromised by the disconinuity at the boundary between the mast and the sail. At the end of the day of course its still likley to be sailing skills that win races and installing a highly efficient wingmast rig will not make you a fleet leader overnight. My interest is simply to experiment and do something a little different. I will be very glad to have anyone point out my misunderstandings or errors if it helps me to learn more. I'll post some thoughts on the rig I'm working on shortly. Ray  

IanHB New Member

Hey Dick, is that Bill in the picture?  

Attached is a conceptual diagram of the wingmast I'm working on; apologies that its neither quite a 2D or a 3D diagram but hiopefully it will be understandable. I'm planning to use a swing rig, the thick green line is the swing rig boom and the sheeting of that is what gives the rig the necessary angle of attack. The blue teardrop shapes are the actual mast and this is allowed to rotate, within adjustable stops, seperately to the swing rig boom. This is to allow the mast to tack and also to allow some adjustment of the fullness of the rig. The soft sail part will be fully battened and the red lihes represent the battens. You will see that these extend into the back two thirds of the mast, the idea is that they 'flop' over from one side to the other as the rig tacks, maintaining the aero section and by resting against the inside of the mast should provide a mechanism for the battens to take on the necessary curve. The purple line is the jib. As you can see, I've included two wing mast sections, one representing the bottom of the rig and the other the top. Both sections use exactly the same aeir section, just scaled to different sizes to allow the rig to taper further up the mast, however, you will also see that the actual mast section retains the same dimensional depth all the way up so at the top it constitutes a much greater percentage of the overall chord of the aerofoil at the top - the reason I've done this is that you will see that it produces a twist in the rig as you go up the mast, I think its around 15deg. I have to get to work now but I'll post some thoughts on the actual approach to construction later. Ray BTW, the black line is the pivot line of the mast  

Hi Ray, interesting, but if it is a fractioned rig (ex. at 80%) you have to solve the forestay attachment problem or not ? Cheers Claudio  

Hi Claudio, the attached diagram will probably help to explain my thinking - essentially I would apply some rake to the mast. By keeping the pivot line vertical and raking the mast it can be arranged that the top of the forestay can be coincidental with the point at which the pivot line cuts the leading edge of the wing. With the addition of some extra local reinforcement it should be possible to use a simple wire hook through a small hole in the leading edge to attach the top of the forestay. Remember that the mast only pivots around 20 or so degrees either side of the pivot line and because this is a swing rig I only need to accomodate a small degree of movement but the principle should hold for a conventional rig. Ray  

Wingmast.jpg

IanHB said: ↑ Hey Dick, is that Bill in the picture? Click to expand...

Just looking through the thread and picked up on the comment Dick made when referencing land yachts - he mentioned apparent wind. I guess that if the forward movement of the rig creates apparent wind then that apparent wind doesn't have the same velocity gradient as real wind (affected by drag as you get closer to the ground or water surface on which you're operating) so perhaps the need for twist higher up the rig is reduced? Thoughts? Ray  

Claudio, I've been looking at your swivel arrangements, you appear to be putting a lot of load onto quite a small pivot? I plan to pivot my wing mast on a short (say 20cm ) stub mast of a good diameter (say 15mm) made of a substantial CF tube that will slot into a tube embedded inside the wingmast. I'm planning to use PTFE tubing as bearings. I think using a longer and thicker pivot arrangement will spread the loads effectively. Ray  

Found some more of those "hidden computer photos" I had stored. 1) Good example of mast on cross-beam with rotation control on leading edge of mast. Also note small white nylon ball at end of a "lever". Pulling down on lever tightens diamond wires, which can be adjusted on the water for mast bend control. No turnbuckles, just diamonds and a lever. 2) A photo (old) of friend's 18 Square that shows mast on ball for rotation. 3) An 18 Square "theory" design of a very large chord wing mast with trailing soft sail. Worked OK but had twist off problems assocated with the deep chord. 4) Solid wing 18 Square ( WILD TURKEY ) and if you look close to top photo you can see how side shrouds and forestay connected. Under the "hood" on leading edge was a curved rod on which the shrouds could slide to allow wing rotation. I'll probably unearth even more hotos I didn't realize I had in my "archives" Cheers :zbeer:  

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Dan Elliott : Wingsail Catamaran Model

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Looks great, Dan! Are you using lifting daggerboards? I did an F48 rc cat with movable ballast-was a blast. Never tried a wing sail...... See the RC Multi thread under "Multihulls" on sailing anarchy. Not much crap on that particular thread.... And some interesting pictures from around the globe.

• Category: Models Uploaded By: Dan Elliott Date: Jul 29, 2011 View Count: 5,826 Comment Count: 1
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