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The Schweizer SGM 2-37 is a two-place, side-by-side, fixed gear, low wing motor glider.〔Said, Bob: ''1983 Sailplane Directory, Soaring Magazine'', page 131. Soaring Society of America, November 1983. USPS 499-920〕 A total of twelve were produced between 1982 and 1988, including nine for the United States Air Force Academy, which designated it the TG-7A. The TG-7A was retired from USAFA service in April 2003.〔〔 The basic airframe was later developed into the SA 2-37A and B covert surveillance aircraft. ==Development== Schweizer had flown a Schweizer SGU 1-19 as a motor glider in 1946 without putting the design into production. Later in 1958 the company carried out a design study of a powered aircraft based on the 1-26 designated as the Schweizer SA 1-30, but after some test flying and modification it was not put into production. A single motorglider prototype, the Schweizer 2-31 was completed, but no further motorgliders were built by the company until 1982.〔Schweizer, Paul A: ''Wings Like Eagles, The Story of Soaring in the United States'', page 120. Smithsonian Institution Press, 1988. ISBN 0-87474-828-3〕 The SGM 2-37 was designed at the request of the USAF for use at USAFA, in both the powered and glider trainer role.〔 To save both money and development time the aircraft used a number of existing aircraft components: * Nose, cowling and engine installation adapted from the Piper PA-38 Tomahawk〔 * Wings adapted from the Schweizer SGS 1-36 Sprite, including extensions to bring it from the Sprite's to and leading edge cuffs to improve stall characteristics〔 * Tail from the Schweizer SGS 2-32〔 The design was intended to be available as a civil aircraft as well as a military aircraft. The USAF version was delivered with a Lycoming O-235-L2C 4-cylinder aircraft engine of . The civil version offered the same engine or an option of a Lycoming O-320 of 150 hp or a Lycoming O-360 of 180 hp.〔〔 The aircraft is of all-metal aluminum monocoque construction. The engine cowling is made from fiberglass and plastics are employed in some of the nonstructural components.〔 The 2-37 features a baggage compartment behind the side-by-side seating. The aircraft does not have flaps, but instead has top-and-bottom wing-mounted balanced divebrakes, similar to other Schweizer glider designs.〔 Performance includes a cruise speed of 114 mph while burning 4 US gal per hour with the O-235 engine. The 17.9 aspect ratio wing provides a glide ratio of 28:1 with the propeller feathered, and a minimum sink speed of 3.16 feet/sec (0.96 m/s).〔〔 The USAF Technical Orders indicate a glide ratio of between 19.3:1 and 19.7:1.〔USAF: ''USAF T.O. 1G-7(T)A-1 Issue C - 30 April 2002'', pages 3-11 and 3-12.〕 The SGS 2-37 was marketed by the company as being suitable for the following roles:〔〔 *Sailplane trainer *Powered aircraft trainer *Glider towplane (with larger horsepower engine option) *Private touring aircraft *Surveillance *Aerial Inspection The 2-37 was later developed into the SA 3-38, known in military service as the Schweizer RU-38 Twin Condor. 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 SGM 2-37」の詳細全文を読む スポンサード リンク
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