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The angle of list is the degree to which a vessel heels (leans or tilts) to either port or starboard at equilibrium—with no external forces acting upon it. [1] If a listing ship goes beyond the point where a righting moment will keep it afloat, it will capsize and potentially sink.
boom crutch A frame in which the boom rests when the sail is not hoisted. boom gallows A raised crossmember that supports a boom when the sail is lowered (and which obviates the need for a topping lift). boomie . Also booms'l rig. A ketch-rigged barge with gaff (instead of spritsail) and boom on main and mizzen. Booms'l rig could also refer to ...
Primarily used to control the angle of the boom, and thereby the mainsail, this control can also increase or decrease downward tension on the boom while sailing upwind, significantly affecting sail shape. For more control over downward tension on the boom, a boom vang may be used. mainstay
Guys, which control spar angle with respect to the apparent wind. Preventer, is cordage attached to the end of the boom and fixed to (or running through a block) on the rail athwart or forward of the mast. Its most common purpose is to prevent potentially dangerous movement of the spar in an accidental gybe.
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In sailing, a boom is a spar (pole), along the foot of a fore and aft rigged sail, that greatly improves control of the angle and shape of the sail. The primary action of the boom is to keep the foot flatter when the sail angle is away from the centerline of the boat. The boom also serves as an attachment point for more sophisticated control lines.
A jibboom (also spelled jib-boom) is a spar used to extend the length of a bowsprit on sailing ships. [1] It can itself be extended further by a flying jib-boom. [1] The heel (i.e. rear and lower) end of the flying jib-boom is attached to the jib-boom, and the heel of the jib-boom to the bowsprit.
An uncontrolled boom slamming to the limit of its range may also put excessive stress on the rigging, can break the boom or standing rigging, or cause dismasting. A jibe can also result in a sudden change in the direction of heel, and can cause unexpected course changes due to the mainsail force changing from one side of the boat to the other.