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The ''Société d'Etudes pour la Propulsion par Réaction'' (SEPR) was a French research and manufacturing company which specialised in the development of liquid-fuelled rocket engines during the 1950s, 60s, 70s and 80s.〔 The SEPR 841 is a liquid-fuelled rocket engine used as an auxiliary power unit for the Dassault Mirage III mixed-power high-altitude interceptor aircraft of the 1960s. The engine was one of several similar developed by SEPR. == Mixed-power == In the 1950s, there was much concern in Western Europe about attacks by fleets of high-flying bombers, such as the Tu-95 ''Bear''. These pre-dated the development of either practical afterburners or surface-to-air missiles and so means to improve the performance of conventional aircraft were sought. Particularly in France, and to some extent in the UK, mixed-power interceptor aircraft were studied, with a combination of jet and rocket power. The rocket would be used for performance at high altitude, increasing either speed or ceiling. French studies for mixed-power interceptors began in 1948.〔 By 1953 the SNCASO Trident aircraft was flying. This was an unusual design, with a single three-chambered SEPR rocket engine as the main engine, assisted for take-off and low altitude flight by two Turbomeca Marboré turbojets. The Trident was difficult to handle on the low-powered turbojets alone and was thirsty for fuel on rocket power. This primary use of the rocket was not repeated in the future: later aircraft would be jet-powered, with the rocket reserved for high-speed dashes. Later rockets would also be considerably less powerful than the Trident's SEPR 48-1. A development for the Trident II aircraft was the two chamber SEPR 631 engine. The two chambers could be fired separately. Although not throttleable, this did give a half-thrust setting. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Société d'Etudes pour la Propulsion par Réaction」の詳細全文を読む スポンサード リンク
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