Sponson

Sponson

Sponsons are projections from the sides of a watercraft, for protection, stability, or the mounting of equipment such as armaments or lifeboats, etc. They extend a hull dimension at or below the waterline and serve to increase floatation or add lift when underway.

Sponsons are commonly used on jetskis and other personal watercraft such as canoes to provide either additional buoyancy and thus stability against capsize, or hydrodynamic forces to resist capsize. They can often be easily attached to an existing craft in order to improve its stability.

They are far less common on ships than such stabilizing means as pontoons, outriggers, and dual hulls due to their comparatively poor performance in stabilizing large hulls. Sponsons are sometimes added to improve stability when ships are modified.

Sponsons are used on the fuselages of flying boats. They take the form of a short wing which when travelling through the water provides hydrodynamic stability during take off and landing.

Sponsons on helicopters are short wings used to provide additional lift when in forward flight. They are often used in larger helicopters where the internal space of the sponson can be used for fuel or to house landing gear without reducing cargo or passenger space in the fuselage as, for example, with the Sikorsky S-92.

The term "sponson" for armament mounting is sometimes used for land vehicles, such as the WWI Mark I tank. In the case of the Bradley Fighting Vehicle, which doubles as a troop transport and armament platform, the sponson refers to the aspect of the vehicle body directly over the tracks and includes layers of hardened, bullet-proof materials to protect the occupants. It is also used as a storage space for both vehicle equipment and components, and either ammunition or crew belongings.


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Look at other dictionaries:

  • Sponson — Spon son ( s[u^]n), n. (Shipbuilding) (a) One of the triangular platforms in front of, and abaft, the paddle boxes of a steamboat. (b) One of the slanting supports under the guards of a steamboat. (c) One of the armored projections fitted with… …   The Collaborative International Dictionary of English

  • sponson — [spän′sən] n. [altered < ? EXPANSION: orig. applied to the platforms on each side of a steamer s paddle wheels] 1. a structure that projects over the side of a ship or boat; specif., a) a projecting gun platform b) an air chamber built into… …   English World dictionary

  • sponson — noun Etymology: perhaps by shortening & alteration from expansion Date: 1835 1. a. a projection (as a gun platform) from the side of a ship or a tank b. an air chamber along a canoe to increase stability and buoyancy 2. a light air filled… …   New Collegiate Dictionary

  • sponson — /spon seuhn/, n. 1. a structure projecting from the side or main deck of a vessel to support a gun or the outer edge of a paddle box. 2. a buoyant appendage at the gunwale of a canoe to resist capsizing. 3. Aeron. a protuberance at the side of a… …   Universalium

  • sponson — noun A projection from the side of a watercraft …   Wiktionary

  • sponson — platform jutting from ship’s deck for gun or wheel Nautical Terms …   Phrontistery dictionary

  • sponson — i. A flange, or a stub, projecting from the side of a flying boat hull to increase the beam of the hull and improve its lateral stability on the water in place of outerwing floats. ii. A projection from the helicopter fuselage in the form of a… …   Aviation dictionary

  • sponson — [ spɒns(ə)n] noun 1》 a gun platform standing out from a warship s side. 2》 a short subsidiary wing that serves to stabilize a seaplane. 3》 a buoyancy chamber fitted to the hull of a canoe. 4》 a triangular platform supporting the wheel on a paddle …   English new terms dictionary

  • sponson — spon·son …   English syllables

  • sponson — spon•son [[t]ˈspɒn sən[/t]] n. 1) navig. a structure projecting from the side or main deck of a vessel, as one supporting a gun 2) navig. naut. a buoyant appendage at the gunwale of a canoe to resist capsizing • Etymology: 1830–40; earlier… …   From formal English to slang

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