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De Havilland Firestreak
The de Havilland Firestreak is a British first-generation, passive infrared homing air-to-air missile. It was developed by de Havilland Propellers (later Hawker Siddeley) in the early 1950s and was the first such weapon to enter active service with the Royal Air Force and Fleet Air Arm, equipping the English Electric Lightning, de Havilland Sea Vixen and Gloster Javelin. It was a rear-aspect, fire and forget pursuit weapon, with a field of attack of 20 degrees either side of the target〔Gibson 2007, p. 33〕 and was partially replaced in service by a developed variant, the Hawker Siddeley Red Top.
==Development==
Firestreak was the result of a series of projects begun with the OR.1056 Red Hawk missile. When this proved too ambitious for the then state of the art, a lower performance specification was released in 1951 as OR.1117, and given the Ministry of Supply rainbow codename Blue Jay.〔
Blue Jay developed as a fairly conventional-looking missile with cropped delta wings mounted just aft of the midpoint and small rectangular control surfaces in tandem towards the rear. Internally, things were considerably more complex. The rear-mounted controls were operated by nose-mounted actuators via long pushrods. The actuators were powered by compressed air from bottles at the rear. The lead telluride (PbTe) IR seeker was mounted under an eight-faceted conical arsenic trisulphide "pencil" nose and was cooled to by anhydrous ammonia to improve the signal to noise ratio. The unusual faceted nose was chosen when a more conventional hemispherical nose proved prone to ice accretion.〔Gibson 2007, p. 34〕 There were two rows of triangular windows in bands around the forward fuselage, behind which sat the optical proximity fuzes for the warhead. The warhead was at the rear of the missile, wrapped around the exhaust of the Magpie rocket.
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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