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They consist of a network of cordage which is rigged to a point on the mast and to a series of points on either side of the boom; these lines form a cradle which helps to guide the sail onto the boom when it is lowered, reducing the crew needed to secure the sail.
Properly securing a line to a belaying pin starts by leading the line under and behind the base of the pin to begin the figure-8 pattern Lines coiled and secured by belaying pins. A belaying pin is a solid metal or wooden device used on traditionally rigged sailing vessels to secure lines of running rigging.
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 ...
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 gnav (the word vang spelt backwards) is an inverted vang. It is a rigid strut that extends obliquely upward from the boom to the mast, exerting a force that pushes down on the boom.
Leech line with jam cleat to control the tension on the leach of a sail Modern sails may come with a standard leech line ( leech control ) that runs under the back edge of the mainsail . This line is usually fixed at the head of the sail, and the other end can be cleated near the clew of the sail.
Running rigging is the rigging of a sailing vessel that is used for raising, lowering, shaping and controlling the sails on a sailing vessel—as opposed to the standing rigging, which supports the mast and bowsprit. Running rigging varies between vessels that are rigged fore and aft and those that are square-rigged.
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Clewlines (green) and buntlines (red) for a single sail. The sail here is semi-transparent; fainter lines are running behind it. Clewlines and buntlines are lines used to handle the sails of a square rigged ship. The leechlines are clearly visible running inwards and upwards from the edges of the sail.