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A wet wing (also referred to as integral fuel tanks [1]) is an aerospace engineering technique where an aircraft's wing structure is sealed and used as a fuel tank. The use of wet wings has become common among civilian designs, from large transport aircraft, such as airliners , to small general aviation aircraft.
The design consists of a series of centre and wing tanks that are divided by horizontal bulkheads. The upper wing tanks form ballast tanks and act as emergency receiver tanks for cargo should the lower tanks be fractured. The lower tanks are connected to these ballast tanks by non-return valves.
A 2,300-litre (600 US gal) Sargent Fletcher drop tank being moved across the flight deck of an aircraft carrier Bangladesh Air Force Chengdu F-7 carries a drop tank at under-fuselage hardpoint. In aviation, a drop tank (external tank, wing tank or belly tank) is used to describe auxiliary fuel tanks externally carried by aircraft. A drop tank ...
Drop tanks, external tanks, wing tanks, pylon tanks or belly tanks are all terms used to describe auxiliary externally mounted fuel tanks. Drop tanks are generally expendable and often jettisonable. External tanks are commonplace on modern military aircraft and occasionally found in civilian ones, although the latter are less likely to be ...
The wing has four sweep settings: 16° for takeoff and landing, 35° and 45° for cruise at different altitudes, and 69° for minimum aspect ratio and wing area in low-level dashes. The variable geometry wing provides excellent STOL performance, allowing a landing speed of 230 kilometers per hour (140 mph), even lower than the Sukhoi Su-17 ...
The winglet and red navigation light on the wing tip of a South African Airways Boeing 747-400 Many aircraft types, such as the Lockheed Super Constellation shown here, have fuel tanks mounted on the wing tips, commonly called tip tanks The wing tip of a Quad City Challenger II, formed with an aluminum bow The wing tip of a Grumman American AA-1, showing its Hoerner style design A Piper PA-28 ...
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The inverted saddle tank was a variation of the Wing Tank where the two tanks were joined underneath the smokebox and supported it. [18] This rare design was used for the same reasons as the wing tank but provided slightly greater water capacity. The Brill Tramway locomotive Wotton is believed [by whom?] to have had an inverted saddle tank.