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Stratofreighter : ウィキペディア英語版
Boeing C-97 Stratofreighter


The Boeing C-97 Stratofreighter is a long-range heavy military cargo aircraft developed from the B-29 and B-50 bombers. Design work began in 1942, with the prototype's first flight being on 9 November 1944, and the first production aircraft entered service in 1947. Between 1947 and 1958, 888 C-97s in several versions were built, 811 being KC-97 tankers.〔Bach, p. 7〕〔Bowers 1989, p. 353-359.〕 C-97s served in the Berlin Airlift, the Korean War, and the Vietnam War. Some aircraft served as flying command posts for the Strategic Air Command, while others were modified for use in Aerospace Rescue and Recovery Squadrons (ARRS).
==Design and development==
The C-97 Stratofreighter was developed towards the end of World War II by fitting an enlarged upper fuselage onto a lower fuselage and wings which were essentially the same as those of the B-29 Superfortress with the tail, wing, and engine layout being nearly identical.〔Swanborough / Bowers 1989, p. 125.〕 It was built before the death of Boeing president Philip G. Johnson. It can be easily distinguished from the 377 Stratocruiser by the "beak" radome beneath the nose and by the flying boom and jet engines on later tanker models.
The prototype XC-97 was powered by the Wright R-3350 engine, the same as used in the B-29. The XC-97 took off for its first flight on November 9, 1944.〔Bowers 1989, p. 353.〕
The tenth and all subsequent aircraft were fitted with the taller fin and rudder of the B-50 Superfortress.〔 The C-97 had clamshell doors under its tail, so that a retractable ramp could be used to drive in cargo. However, unlike the later Lockheed C-130 Hercules, it was not designed as a combat transport which could deliver directly to primitive forward bases using relatively short takeoffs and landings. The rear ramp could not be used in flight for air drops.
On 9 January 1945, the first prototype, piloted by Major Curtin L. Reinhardt, flew from Seattle to Washington, DC in 6 hours 4 minutes, an average speed of with of cargo, which was for its time impressive for such a large aircraft. Production models featured the Pratt & Whitney Wasp Major engine, the same engine as for the B-50.
The C-97 had a useful payload of and could carry two normal trucks, towed artillery, or light tracked vehicles such as the M56 Scorpion. The C-97 was also the first mass-produced air transport to feature cabin pressurization, which made long range missions somewhat more comfortable for its crew and passengers.
The civilian derivative of the C-97 was the Boeing 377 Stratocruiser, a very luxurious transoceanic airliner which featured a lower deck lounge and could be fitted with sleeper cabins. The first Stratocruiser flew on July 8, 1947. Only 56 were built.〔Bach, p. 40〕

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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