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__NOTOC__ The Schweizer SGU 1-7 is an American Open Class, single-seat, high-wing strut braced glider built by Schweizer Metal Aircraft Company of Elmira, New York.〔Said, Bob: ''1983 Sailplane Directory, Soaring Magazine'', page 26. Soaring Society of America, November 1983. USPS 499-920〕 The first 1-7 was built in 1937 and the second one was completed in 1939.〔〔 The 1-7 was the first Schweizer aircraft which was produced as more than a single example and it was the first aircraft that the company sold.〔〔 ==Design and development== Schweizer Aircraft started construction of the 1-7 prototype 1937, shortly after the SGU 1-6 came in third in the 1937 Eaton Design Contest. The intention was that the winning design would be made available as drawings and kits for amateur construction and that Bureau of Air Commerce certification would be sought.〔 The 1-6 had not fared well in the competition and none of the winners in the contest had proven as easy to construct as the contest organizers had hoped. As a result of the lessons learned in the Eaton contest a new clean-sheet design was started by the Schweizer brothers.〔 The resulting single seater-seventh design (1-7) was quite different from the 1-6. The 1-6 had been an all-metal design including aluminum-covered wings and was the first all-metal glider ever built.〔 The 1-7 was designed to use more traditional methods and has a steel-tube fuselage frame covered in aircraft fabric. The wing is a constant chord, single spar, strut-braced type, including jury struts. The wing and horizontal tail are built from aluminum with fabric covering. The aircraft was designed to be as simple and inexpensive as possible to construct, even at the cost of higher performance.〔 The 1-7 design was never certified and both aircraft completed were registered as experimental amateur-built aircraft.〔〔 While only two Schweizer SGU 1-7s were built the type was the beginning of a long line of Schweizer gliders based upon this design. The 1-7 lead directly lead to the improved single place Schweizer SGU 1-19 and long-wing Schweizer SGU 1-20. With two seats installed the basic design became the Schweizer SGU 2-22 trainer and finally evolved into the Schweizer SGS 2-33.〔〔 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「Schweizer SGU 1-7」の詳細全文を読む スポンサード リンク
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