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Saab 21
The SAAB 21 was a Swedish fighter/attack aircraft from SAAB that first took to the air in 1943. It was designed as a twin boom pusher configuration, where the propeller was mounted in the rear of the fuselage, pushing the aircraft forward.
==Design and development==
Sweden wished to ensure its continued neutrality through a policy of armed strength during World War II but was effectively denied access to foreign weapons. The original design studies began in 1939, based around the use of a "buried" Bristol Taurus engine. The project remained dormant until 1941. In response to the need for air defence, and faced with the prospect of imported designs being unavailable due to the war, Sweden undertook an indigenous rearmament programme including an advanced fighter. The low-wing monoplane Saab 21 fighter was ultimately designed around a license-produced version of the Daimler-Benz DB 605B engine, featured innovations such as tricycle landing gear, heavy forward-firing armament, ejector seat, and a twin-boom pusher layout that later allowed the type to be modified with a turbojet engine.
The advantages of a pusher design are that the view forward is unobstructed and armament can be concentrated in the nose, while a major drawback is difficulty in escaping from the aircraft in an emergency, as the pilot could get drawn into the propeller blades. Saab deliberated between systems that would eject the pilot, or jettison the propeller or the engine, via a system of explosive bolts,〔Erichs et al. 1988, p. 22.〕 and eventually installed an early ejector seat developed by Bofors for the purpose and tested in 1943.〔
In 1947, the aircraft was extensively redesigned with over 50% airframe, tailplane and wing changes and fitted with a de Havilland Goblin turbojet, acquiring the new designation Saab J 21R.〔Erichs et al. 1988, p. 23.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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