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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]
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.
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.
In light air, a boomkicker provides better sail shape by lifting the boom and opening the leech. No topping lift is required when using the boomkicker. As a consequence, reefing is safer and easier with better boom control, and when dropping the mainsail the boom will not hit the deck.
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Buntlines lift the middle portion of the sail, or "bunt"; there will usually be four to eight buntlines across the foot of the sail. Traditionally they are secured to the sail with buntline hitches. [1] Since buntlines only have to lift a section of canvas, they can be thinner than the clewlines and are not usually fitted with a purchase.
The primary advantage of adjusting the cunningham is the speed and ease with which the luff tension can be changed while sailing or racing. By either hauling or easing the line, the tension in the luff can be changed, thereby shifting the point of maximum draft of the sail forward or aft respectively, optimizing sail shape and thus performance ...
The boat is equipped with two sheeting winches and two winches for the internally-mounted halyards. The 4:1 outhaul and the reefing system are also internally-mounted. There is a 2:1 Cunningham , a fixed topping lift and a 4:1 mainsheet mounted at the rear of the center cockpit on the roof of the aft cabin.