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The retractability allows the centreboard to be raised to operate in shallow waters, to move the centre of lateral resistance (offsetting changes to the sailplan that move the centre of effort aft), to reduce drag when the full area of the centreboard is not needed, or when removing the boat from the water, as when trailering.
A boathouse (or a boat house) is a building especially designed for the storage of boats, normally smaller craft for sports or leisure use. [1] These are typically located on open water, such as on a river. Often the boats stored are rowing boats. Other boats such as punts or small motor boats may also be stored.
A daggerboard is a retractable centreboard used by various sailing craft. While other types of centreboard may pivot to retract, a daggerboard slides in a casing. The shape of the daggerboard converts the forward motion into a windward lift, countering the leeward push of the sail. The theoretical centre of lateral resistance is on the trailing ...
Boat deck: Especially on ships with sponsons, the deck area where lifeboats or the ship's gig are stored. Boiler deck : (river steamers) The passenger deck above the vessel's boilers . Bridge deck : (a) The deck area including the helm and navigation station, and where the Officer of the Deck/Watch will be found, also known as the conn .
The U.S. Navy airship USS Macon under construction at the Goodyear Airdock in 1932.. In 1929, Goodyear Zeppelin Corporation, later Goodyear Aerospace, sought a structure in which "lighter-than-air" ships (later known as airships, dirigibles, and blimps) could be constructed. [5]
A retractable bow thruster lowered under the front of a sailboat Instead of a tunnel thruster, boats from 30 to 80 feet (9 to 24 m) in length may have an externally mounted bow thruster . As its name suggests, an external bow thruster is attached to the bow , making it suitable for boats where it is impossible or undesirable to install a tunnel ...