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Breguet 693
The Breguet 690 and its derivatives were a series of light twin-engine ground-attack aircraft that were used by the French Air Force in World War II.
The aircraft was intended to be easy to maintain, pleasant to fly and to be able to fly at 480 km/h (300 mph) at 4,000 m (13,120 ft). The type's sturdy construction was frequently demonstrated and the armament was effective. However, French rearmament began two full years later than that in Britain, and all of these aircraft were simply not available in sufficient numbers to make a difference in 1940.
==Design and development==
The 690 had begun life in 1934 as Breguet's response to the same strategic fighter aircraft specification as the eventual winner, the Potez 630. Both were twin-engine monoplanes with twin tailplanes, powered by Hispano-Suiza 14AB radial engines of contemporary design and performance. Breguet considered the weight limits of the specification - requiring a twin-engine, three-man aircraft to be lighter than 3,000 kg/6,600 lb (later 3,500 kg/7,700 lb) - to be overly restrictive and ignored them. Instead, the design was advertised as particularly versatile, with reconnaissance, ground attack and level bombing derivatives proposed that required no structural changes. Unsurprisingly, Breguet lost out in the competition to Potez, but confident in the 690's potential, nevertheless began building a prototype on its own funds.
Although it had kept informed about foreign developments with dive bombers in the early 1930s, the French Air Force did not decide to acquire modern ground-attack aircraft before 1937.〔Ehrengardt 2002, p. 8.〕 Engineless for nearly a year, the 690-01 prototype finally flew on 23 March 1938,〔Green 1967, p. 136.〕 and displayed such promise that 100 two-seat attack bomber versions known as the Breguet 691 AB2 were ordered in June 1938, an order which was eventually doubled.〔Ehrengardt 2002, p. 10.〕 For the ground-attack role, the 691's equipment included a 20 mm cannon and a pair of 7.5 mm (.295 in) machine guns firing forward, as well as an internal bomb rack that could be used in a shallow dive attack and was typically loaded with eight 50 kg (110 lb) bombs. Rear defense was provided by one flexible 7.5 mm (.295 in) machine gun, while a fixed, rearward-firing weapon of the same type was fitted under the fuselage to discourage low-flying fighters or ground fire from behind. A set of armour plates protected the crew, and the fuel tanks had rudimentary self-sealing capability, but this protection proved insufficient in combat.
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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