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SNCASO SO.4000
The SNCASO SO.4000 was an experimental French twin-engine jet-bomber aircraft of the 1950s. Only a single example was built, which only made a single test flight before development was abandoned.
==Design and development==
The French Air Force drew up a requirement for a jet bomber shortly after the end of the Second World War, with the new bomber expected to have a weight of about 25–30 tonnes and to fly at high-subsonic speeds. Designs were tendered by SNCASO, the SO 4000 and by SNCAC, the SNCAC NC 270, which resulted in SNCASO receiving an order for two manned scale models, the first, the SNCASO M.1 - an unpowered glider which would be tested from atop the first prototype of the Heinkel He 274 which had remained in France post-war and restored to flightworthiness by the French, while the SNCASO M.2 was powered by a single Rolls-Royce Derwent, and a full-size prototype, as did SNCAC.〔〔("Le Sud-Ouest SO-4000: I. Origine" ). ''Le Sit des Projets et Prototypes d'Avions''. 14 May 2003. Retrieved 15 May 2011.〕
The SO.4000 had a mid-mounted wing swept at an angle of 35 degrees, and had a carefully streamlined oval section fuselage accommodating two 22.2 kN (4,980 lbf) Rolls-Royce Nene engines mounted side-by-side in the rear fuselage, while it was fitted with a tall tricycle landing gear with tandem mainwheels.〔 The crew of two sat in a pressurized cockpit in the extreme nose of the aircraft.〔''Flight'' 12 May 1949, p. 552.〕 The aircraft was designed to carry a bombload of up to 5,000 kg (11,000 lb), while it was planned to fit remotely controlled barbettes carrying two 15 mm cannon on the wingtips.〔("Le Sud-Ouest SO-4000: II. Le NC-270 & le SO-4000" ). ''Le Sit des Projets et Prototypes d'Avions''. 14 May 2003. Retrieved 15 May 2011.〕
Although production plans were abandoned in 1947, it was decided to complete the two scale models and the full size prototype for experimental purposes.〔("Le Sud-Ouest SO-4000: V. Essai et abandon du SO-4000" ). ''Le Sit des Projets et Prototypes d'Avions''. 14 May 2003. Retrieved 15 May 2011.〕 The M.2 made its maiden flight on 13 April 1949, with the M.1 glider making its first free-flight, launched from a SNCASE Languedoc on 26 September 1949.〔 Testing of the M.2 was successful, with it exceeding 1,000 km/h (621 mph) in a dive. The SO.4000 was rolled out on 5 March 1950, but was damaged when its undercarriage collapsed during taxi-tests on 23 April that year. After repair, it made its maiden flight on 15 March 1951, but its undercarriage failed again on landing, and the project was abandoned, with no more flight testing being carried out.〔
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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