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The Stinson L-1 Vigilant (company designation Model 74) was a 1940s American light observation aircraft built by the Stinson Aircraft Company at Wayne, Michigan (by November 1940 a division of Vultee Aircraft Corporation).〔Eden and Moeng 2002, p. 1100.〕 The aircraft was operated by the United States Army Air Corps as the O-49 until 1942. ==Design and development== The Vigilant was designed in response to a 1938 United States Army Air Corps design competition for a two-seat light observation aircraft. When the German-manufactured Fieseler Storch was demonstrated at the Cleveland Air Races, the Air Corps revised its specifications in an attempt to match the performance of the Storch. Stinson (later a division of Vultee), won the $1.5 million contract over 11 competitors, including the Bellanca YO-50 and Ryan YO-51 Dragonfly.〔Merriam 2002, p. 26.〕 The Model 74 was a single radial engined high-wing monoplane with trailing-edge high-lift devices for low speed and high lift performance. The prototype aircraft was built full-span leading-edge automatic slots manufactured by Handley Page, and slotted flaps. The Model V-74 was given the Army designation YO-49 for evaluation, with the first flight by test pilot Al Schramm on 15 July 1940.〔 The aircraft was built of steel tubing and fabric, with the fuselage forward of the wing enclosed in sheet metal. Control surfaces and the empennage were fabric-covered stainless steel. The Lycoming power plant was hand-cranked inertia starting, and was fitted with a Hamilton Standard constant speed propeller. At least 12 ambulance conversions were fitted with Edo 49-4000 pontoons (4,000-pound displacement)〔Merriam 2002, p. 27.〕 for amphibious landings and takeoffs.〔 The Vigilant was capable of stopping in less than its own length, and could maintain stable flight at 31 miles per hour. Anecdotally, the Vigilant was said to be capable of backwards flight in a strong headwind.〔 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「Stinson L-1 Vigilant」の詳細全文を読む スポンサード リンク
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