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The crab claw sail is a fore-and-aft triangular sail with spars along upper and lower edges. The crab claw sail was first developed by the Austronesian peoples by at least 2000 BCE. It is used in many traditional Austronesian cultures in Island Southeast Asia , Micronesia , Island Melanesia , Polynesia , and Madagascar .
A mast-aft rig is a sailboat sail-plan that uses a single mast set in the aft half of the hull. The mast supports fore-sails that may consist of a single jib, multiple staysails, or a crab claw sail. The mainsail is either small or completely absent. Mast-aft rigs are uncommon, but are found on a few custom, and production sailboats. [1]
Fore-and-aft rigged sails include staysails, Bermuda rigged sails, gaff rigged sails, gaff sails, gunter rig, lateen sails, lug sails, tanja sails, the spanker sail on a square rig, and crab claw sails. Fore-and-aft rigs include: Rigs with one mast: the proa, the catboat, the sloop, the cutter; Rigs with two masts: the ketch, the yawl
The mast usually hinges, adjusting the rake or angle of the mast. The crab claw configuration used on these vessels is a low-stress rig, which can be built with simple tools and low-tech materials, but it is extremely fast. On a beam reach, it may be the fastest simple rig. Crab claw examples
The crab claw configuration used on these vessels is a low-stress rig, which can be built with simple tools and low-tech materials, but it is extremely fast. On a beam reach, it may be the fastest simple rig. Another evolution of the basic crab claw sail is the conversion of the upper spar into a fixed mast.
Instead it has a "crab claw" sail, [1] and is further controlled by the skillful use of fore and aft trim—moving the boat's balance point, that is the center of resistance relative to the center of effort—to control her heading. [1] [3] This is essentially like a wind surfer. See Sail twist.
Modern sailing outrigger canoes are usually made from glass-reinforced and carbon fiber-reinforced polymer, with sails made from Dacron and Kevlar. Hōkūleʻa is a modern interpretation of a Polynesian voyaging canoe. It is made from modern materials such as fibreglass, plywood, resin glue, terylene sails and ropes with modern fittings and ...
Sail plan of what Taumako builders call a tealolili (a smaller, simpler design than tepukei), The simplistic image below was drawn from photos of the Maunga Nefe and the Vaka Taumako Project. It shows a symmetrical double-ended hull, and long-armed claw sail, with windward and leeward booms.