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The topping lift indicated Topping lift on a US Yachts US 22 sailboat. The topping lift (more rarely known as an uphaul) is a line which applies upward force on a boom on a sailboat. Part of the running rigging, topping lifts are primarily used to hold a boom up when the sail is lowered. [1]
1 – boom, 2 – mast, 3 – gooseneck, 4 – sail, 5 – topping lift... 7 – mainsheet, 8 – boom vang.... 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.
While under sail, the opposite force to the vang is supplied by the sail itself. When the sail is furled, a topping lift supplies the upward force on the boom. Some line vang systems incorporate a piston to provide the topping lift force and to damp oscillations. Hydraulic vangs can inherently act in the topping lift role.
A boomkicker [1] [2] is a modern mechanical device on boats that pushes the boom up by one or more glassfiber rods. If the boom is sheeted in, the rods will bend and produce a force upwards.
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Sail components include the features that define a sail's shape and function, plus its constituent parts from which it is manufactured. A sail may be classified in a variety of ways, including by its orientation to the vessel (e.g. fore-and-aft) and its shape, (e.g. (a)symmetrical, triangular, quadrilateral, etc.).