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The SNCASO SO.9000 Trident was a mixed power French prototype interceptor aircraft of the 1950s. Capable of supersonic flight the project was cancelled in July 1957 after only 12 examples had been built. ==Design and development== The French Air Staff tasked SNCASO to develop a point defence interceptor, studies began in October 1948.〔Gunston 1981, pp. 218—219.〕 The aircraft that emerged was a shoulder wing monoplane, to be primarily powered by a SEPR rocket engine and augmented with wing-tip mounted turbojets. First flown on 2 March 1953 by test pilot Jacques Guignard the aircraft used the entire length of the runway to get airborne powered only by its turbojets.〔 From March 1955 the Trident I flew with new turbojets, the more powerful Dassault-built MD 30 Viper ASV.5, which produced 7.34 kN (1,654 lbf) thrust each. With these engines it soon exceeded Mach 1 in a shallow dive without rocket power.〔Jane's All the World's Aircraft 1956/7, pages 154-5〕 Test flights of the SO.9000 were described by the author Bill Gunston as 'hairy' until the rocket motor was added in September 1954. During the 18-month test programme the aircraft completed over 100 flights, eventually reaching a speed of Mach 1.8 and an altitude of 20,000 metres (65,000 ft).〔 A Trident II was lost due to an accident on 21 May 1957 〔(''Flight,'' 1957 ) Retrieved: 15 October 2010〕 In 1958, the Trident II set time to height and altitude records. Its record altitude of 24,300 m in May was made by Roger Carpentier〔("Trident's 79,720ft" )〕 The project was cancelled in July 1957; the decision was influenced by the manned fighter cuts announced by the British Defence Minister, Duncan Sandys.〔 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「SNCASO Trident」の詳細全文を読む スポンサード リンク
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