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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]
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.
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
In Island Southeast Asia, these developed into double outriggers on each side that provided greater stability. The triangular crab claw sails also later developed into square or rectangular tanja sails, which like crab claw sails, had booms spanning the upper and lower edges. Fixed masts also developed later in both Southeast Asia (usually as ...
Bigiw with tanja, crab claw, and spritsails from the Island Garden City of Samal, Davao del Norte. Bigiw is a small double-outrigger sailboat native to the islands of Mindanao (particularly in the Island Garden City of Samal), Visayas, and Palawan in the Philippines. It is used for personal transport or small-scale fishing and can hold one to ...
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The lateen rig was also the ancestor of the Bermuda rig, by way of the Dutch bezaan rig. In the 16th century, when Spain ruled the Netherlands, the lateen rigs were introduced to Dutch boat builders, who soon modified the design by omitting the mast and fastening the lower end of the yard directly to the deck, the yard becoming a raked mast ...