Other uses a sail is any type of surface intended to move a vessel, vehicle or rotor by being placed in a windin essence a propulsion wing. The polytarp is breaking down, but the clips are still in great shape and have held the tension to the spars extremely well. Catamaran raft made from 12 6 metre 100mm electrical duct outboard and 12 100 litre plastic chemical drums inboard, rigged with horizontal sail system crab claw sail at cass bay, lyttelton. About 6% of these are surimi, 14% are crab, and 1% are roe. Anyone who has been following tim andersons excellent series about canoe building might be interested in this tutorial, until tim does a better one that is.
The crabclawshaped sails, made of plaited mats of palmlike pandanus leaves, were attached to the mast with threeply rope made of twisted bark fiber. A key question in the design of a crab claw sail and rig for your sailboat is whether to fix the tack of the sail aft of the mast, or to let it go forward of the mast. Sails may be made from a combination of woven materialsincluding canvas or polyester cloth, laminated membranes or bonded filamentsusually in a three or foursided shape. Mar 24, 20 shunting crab claw sail with spinnaker pole to assist in. Etsy is the home to thousands of handmade, vintage, and oneofakind products and gifts related to your search. This yahoo group is devoted to discussions on proas and is a good resource for information on the crab claw. Our sail design software is used by 270 lofts worldwide. Papillon sailgeometry suspended rigcrab clawlateen sail. The a frame has to rock to accommodate the arc the nose of the rig would swing through. Dec 10, 2002 the performance of any sailing craft largely depends on the power of the available sail how the rig uses the wind and turns it into a useful driving force. Often ingenious, the work available endeavours more to optimize performance than to simplify use, while the goal of the beneteau project is to simplify propulsion as much as.
The crab claw sail or, as it is sometimes known, oceanic lateen or oceanic sprit, is a triangular sail with spars along upper and lower edges. I am wondering about a small modification to this design along the lines of what has been done to a pivoting crab claw sail. The papillion can also be compared to a lateen sail and has elements from the bermuda. I used one of the sail patterns investigated in this book for my sail.
The equal length sides are usually longer than the third side, with spars along the long sides the crab claw may also traditionally be constructed with curved spars, giving the edges of the sail along the spars a convex shape, while the leech of the sail is often quite concave to keep it stiff on the. Sep 02, 2011 square foot for square foot, the crab claw see vid is the best sail across most points of sailing. Performance of a bamboopolytarp crab claw sail on a tiki. The crab claw sail consists of a sail, approximately an isosceles triangle in shape. If this gives all the advantages of the crabclaw, plus tacking, it would be great. Blue crab software thoughtful information technology. They are shorter and the crab craw sail is turned in every angle even upright above the sailor appearing like a boat top canvas. Jul 28, 2017 the isabella crab claw classic the iccc movie 1. Sailors could also configure them to catch rainwater for drinking during the voyages, which could last for three or four months. Here is a free sample design from one of our machine embroidery collections for sale. Decisive meetinglateen or crab claw sail, junk, kite or wing sail rig, the boatyard developers began by observing and analysing existing research on the different forms of wind propulsion. Media in category crab claw sails the following 39 files are in this category, out of 39 total.
The crab claw is a triangular sail on a short mast. The roach on a square sail design is the arc of a circle above a straight line from clew to. Propelled by simple, yet efficient crab claw sails also known as oceanic lateen or. To get the crab claw s aerodynamic advantages vortex lift. Crab claw sails used with singleoutrigger ships in micronesia, island. If thats right, i wonder if a plain old sunfish style boomed lateen is a crab claw sail, either rigged normally, or at least when you tilt it forward so the boom is. There is a lot of discussion on the merits of the crab claw sail configuration. Their invention of catamarans, outriggers, and the highlyefficient bisparred triangular crab claw sails enabled their ships to sail for vast distances. He has authored two books, 62 projects to make with a dead computer and simple bots. Optical character recognition software or keyboarded. Unlike the lateen where the sail pivots around the mast the crab claw pivots around the upper leading spar. The papillon sail is a 60 degree arc geometry, held by two spars attached to a small mast. New boat promises safer fishing on deadly bering sea ctv news. Altrock supergroup collaboration featuring members from brave baby, susto, the high divers, johnny delaware, and.
Sail7 is an analysis tool based on the linear panel methods. This instructable describes the construction of a simple sail from cheap material. I found some old light aluminum lateen spars while searching for stiffeners. If used on the wrong boat, it loses virtually all its advantage. During the 16th19th centuries other foreandaft sails were developed in europe, such as the spritsail, gaff rig, jib. New boat promises safer fishing on deadly bering sea ctvnews. The original crab claw sail has been left rigged and under tension in the florida summer sun for over 3 months. Sail characteristics derive, in part, from the design, construction and the attributes of the fibers, which are woven together to make the sail cloth. This means you can steer pretty well with sail controls alone, again like a wind surfer. Sail7 is a design and optimisation tool for sail performance. Sails may be made from a combination of woven materialsincluding canvas or polyester cloth, laminated membranes or bonded filamentsusually in a three or.
At the time, as a practical sailor, i could see the handling, i. It would be interesting to know whether its better to have a simple triangle or what effect the horns have. Feb 02, 2009 catamaran raft made from 12 6 metre 100mm electrical duct outboard and 12 100 litre plastic chemical drums inboard, rigged with horizontal sail system crab claw sail at cass bay, lyttelton. The crab claw sail is used in many traditional austronesian cultures, as can be seen by the traditional paraw, proa, lakana, and tepukei. As the sail is trimmed to catch the wind, so the winelecs electric motors automatically switch off. Since the launching of our wharram tiki 21, milagra, back in the summer of 2012, we have been propelled primarily by an oceanic lateen, or crab claw main sail weve tried a small 7. We believe it is the easiest to use and most productive sail design software available and integrates flawlessly with our automation process.
A wide variety of crab claw options are available to you, such as certification, style. This sails design has the main benefit of catching the upper windswhich have greater velocity. A site with plans for a kind of model proa that uses a crab claw sail. Reserve a table at crab and claw siam paragon, bangkok on tripadvisor. The first seagoing sailing ships were developed by the austronesian peoples from what is now southern china and taiwan. But sail forces are determined by a multitude of factors, including wind speed, sail area, sail shape, sail setting, the hull, angle of heel, wind gradient, and steadiness of the wind. Jul 23, 2014 even more startling is the extraordinary performance of the crab claw sail, which demonstrates its superiority to a bermuda mainsail right from the closehauled condition. A short mast, no longer than boattrailer length, easy to raise, was to be an. The boom then splits open lengthwiseits hinged at its forward endto unroll a crab claw sail of the type most commonly associated with pacific fishing outriggers. The boom then splits open lengthwiseits hinged at its forward endto unroll a crabclaw sail of the type most commonly associated with pacific fishing outriggers.
Often ingenious, the work available endeavours more to optimize performance than to simplify use, while the goal of the beneteau project is to simplify. A bermuda sail is similar to crab claw, but in relation to the mast, can the crab claw rig be used on a the same mast. This book presents scientific explanations of how sailboat work and why including investigations into many different types of sails including the crab claw. The sail shown here is a crab claw or oceanic lateen, which is being built for my nearlyfinished proa. Malcolm henry improvements to a delta crabclaw sail published in catalyst 31. Having seen the crab claw rig on aluna, i find myself now seriously considering putting one on our tiki 38. A sail is a tensile structuremade from fabric or other membrane materialsthat uses wind power to propel sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and even sailpowered land vehicles. A site all about polynesian proas and the different sails they use including the crab claw. Canoe and fireworks, woodblock print by arman manookian, 6 x 4.
Polynesian style crab claw sail i decided on a 14 hull because the boat had to be easy to handle on land and this was my first boat building project so i wanted to keep it small. The best online retailer of boat building supplies, hardware and tools. Over the last 10 years he has created hundreds of stepbystep tutorials on diverse subjects ranging from pancakes to selfdriving robotic queensized beds. Square foot for square foot, the crab claw see vid is the best sail across most points of sailing. The sail shown here is a crab claw or oceanic lateen, which is being built for. The bow line tilts the entire rig and also changes the center of effort. Next step i think will be doing a more traditional triangular crab claw. The airflow over a crab claw sail looks like a fascinating subject for a phd project, with so many variables, and thats before you move on to stress analysis of the structure. Dec, 20 new boat promises safer fishing on deadly bering sea. Tony marchaj agreed with the suggestion and later tested pacific crab claw sails in a wind. Triangular foreandaft rigs were invented in the mediterranean as singleyarded lateen sails and independently in the pacific as the more efficient bisparred crab claw sail, and continue to be used throughout the world. Customers are free to download and save these images, but not use these digital files watermarked by the zomato logo for any commercial purpose, without prior written permission of zomato.
Boat design ratios a handy glossary explaining what all the numbers mean. Aug 02, 2017 the boom then splits open lengthwiseits hinged at its forward endto unroll a crabclaw sail of the type most commonly associated with pacific fishing outriggers. Crab claw rigs is the crab claw a better sail for cruising than the rigs weve been using. No matter what youre looking for or where you are in the world, our global marketplace of sellers can help you find unique and affordable options. I truly love the simplistic nature of the junk rig and loved the one i had, but they are not practical on a catamaran for higher speed cruising. Shunting crab claw sail with spinnaker pole to assist in. Even more startling is the extraordinary performance of the crab claw sail, which demonstrates its superiority to a bermuda mainsail right from the closehauled condition. The racing style is an application of the ancient polynesian form of crab claw sail into the builtin limits of a sunfish. A cat is a fast hull design, much faster than a monohull and not requiring ballast. In this case the sailcloth is supported by spars both along the top and bottom of the sail. New boat promises safer fishing on deadly bering sea. There are several key factors in evaluating a fiber for suitability in weaving a sail cloth.
Today we honor our roots in maryland and the long tradition of maritime activity in this state. Crab claw problem possibly solved nourishing obscurity. Sailmakers now use computer software connected to laser cutting machines. Specify the sails overall dimensions, luff, foot, leech etc. Altrock supergroup collaboration featuring members from brave baby, susto, the high divers, johnny delaware, and band of horses. I think next time ill go with 16 because the plywood for the hulls comes in 4 x 8 pieces and so 16 is the biggest you can go with only one scarf joint. Mar 24, 20 shunting crab claw sail with spinnaker pole to assist in shunting.
The crab claw sail is used in many traditional pacific ocean cultures, as can be seen by the traditional proa and tepukei. Randy sarafan is an artist, designer, inventor, and founder of the instructables design studio. Shunting crab claw sail with spinnaker pole to assist in shunting. That one has an unraked vertical mast, with a boom that curves back, then up, creating a ushaped sail with spars on each edge but the top.
That does not mean that each modern sailing kayak or design feature is. Dec 05, 2014 the airflow over a crab claw sail looks like a fascinating subject for a phd project, with so many variables, and thats before you move on to stress analysis of the structure. Blue north officials say the design will work for bringing in cod, salmon and halibut but not for crab, the prize haul on the discovery. Blue north officials say the design will work for bringing in cod, salmon and halibut.
Crab boil trio vintage embroidery design, vintage stitch three in a row crab boil design for machine embroidery. Performance of a bamboopolytarp crab claw sail on a tiki 21. While youre there, dont miss the rest of the proafile site. In 1981, we were designing a radical trailersailer coastal trek catamaran, called the tiki 21.
Its superiority increases when the boat bears away, and on reaching, with the heading angle 90 degrees, the driving force coefficient of the crab claw is about 1. The traditional oceanic sprit rig aka crab claw has, in western eyes. The crab claw shaped sails, made of plaited mats of palmlike pandanus leaves, were attached to the mast with threeply rope made of twisted bark fiber. Please practice handwashing and social distancing, and check out our resources for adapting to these times. The crab claw definitely seems very simple and low tech which i like a lot. What type of other available mast will a crab claw sail work best on. No, i say, what you and the wind are looking at is a soft wing sail.