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From the hook a cordage tail passes through a turnblock on the deck at the base of the mast and back to a cleat on the deck. Often the tail is split so the cunningham can be operated from either sidedeck in a racing dinghy. [4] Downhauls, which lower a sail or a yard, and can be used to adjust the tension on the luff of a sail. [1]
The advantage of water ballast is that the tanks can be emptied, reducing draft or the weight of the boat (e.g. for transport on ground) and water added back in (in small boats, simply by opening up the valves and letting the water flow in) after the boat is launched or cargo unloaded.
Thompson Hiawatha model canoe. The Thompson Brothers Boat Manufacturing Company of Peshtigo, Wisconsin was a manufacturer of pleasure boats and canoes.Founded by brothers Peter and Christ Thompson in 1904, [1] the company became prominent in the field and built boats for nearly one hundred years. [2]
A sail control that lets one apply downward tension on a boom, countering the upward tension provided by the sail. The boom vang adds an element of control to sail shape when the sheet is let out enough that it no longer pulls the boom down. Boom vang tension helps control leech twist, a primary component of sail power. boomkin. See bumpkin. booms
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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.
Copper sheathing is a method for protecting the hull of a wooden vessel from attack by shipworm, barnacles and other marine growth through the use of copper plates affixed to the surface of the hull, below the waterline. It was pioneered and developed by the Royal Navy during the 18th century. In antiquity, ancient Chinese used copper plates ...
Boat building is the design and construction of boats (instead of the larger ships) — and their on-board systems. This includes at minimum the construction of a hull , with any necessary propulsion, mechanical, navigation, safety and other service systems as the craft requires.