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A Twin-boom aircraft has two longitudinal booms fixed to the main wing on either side of the centre line. The booms may contain ancillary items such as fuel tanks and/or provide a supporting structure for external ancillary items. Typically, twin tailbooms provide mounting points for one or more tail surfaces, although on some types such as the Rutan Model 72 Grizzly the booms run forward of the main wing. The twin-boom configuration is distinct from twin-fuselage designs.
The twin-boom configuration allows a cargo door or large access door to be placed in the back of the aircraft, free from obstruction by the tail assembly. Examples include the C-82 Packet, C-119 Flying Boxcar, Armstrong Whitworth AW.660 Argosy and Transavia PL-12 Airtruk.
The twin-boom configuration has been adopted by combat aircraft designers for several reasons:
- To allow an engine to be mounted directly at the rear of a short fuselage, for pusher configuration or jet aircraft (Bell XP-52, De Havilland Vampire, Saab 21)
- To give an unobstructed field of view or field of fire to the rear (Focke-Wulf Fw 189)
- To accommodate twin early inline engines and their lengthy turbochargers in the most aerodynamically efficient/practical planform (P-38 Lightning, P-61 Black Widow)
Some modern high-efficiency designs have twin booms which distribute the load along the wing span and/or stiffen the overall structure.
List of twin-boom aircraft
- Green, W. and Swanborough, G.; The complete book of fighters, Salamander, 1994, Page 521.
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