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The Bowlus/Nelson BB-1 Dragonfly is an American, two seat, strut-braced, high-wing motor glider that was developed from the Bowlus BA-100 Baby Albatross glider by Hawley Bowlus.〔Said, Bob: ''1983 Sailplane Directory, Soaring Magazine'', page 118. Soaring Society of America, November 1983. USPS 499-920〕 ==Design and development== The development of the Dragonfly was sponsored by the Nelson Engine Company to promote the use of their H-44 four cylinder two-stroke engine. The engine was mounted in the rear of the fuselage pod, in pusher configuration, with the wooden two bladed propeller below the metal tail boom. The fuel tank holds , enough for self-launching, but not for cross-country powered flight.〔〔〔 The Dragonfly shares the Baby Albatross's molded plywood fuselage pod, aluminium tube tail boom and strut-braced double spar wooden wing, covered in aircraft fabric aft of the spar. The leading edge is a plywood D-cell. The aircraft features dual controls and a retractable tricycle landing gear with a steerable nose wheel. The engine is started by a ratchet-wire recoil start system that allows restarts in flight, as well as on the ground.〔〔 Federal Aviation Administration certification of the type was achieved on 21 April 1947, with Nelson Aircraft Corporation as the certificate holder and the type officially known as ''Nelson Auxiliary Power Glider BB-1''. The type certificate indicates that neither the engine nor the propeller need be certified. The type certificate specifies that the Nelson H-49 engine of may also be installed. The Dragonfly was later replaced in production by the improved Nelson Hummingbird PG-185B.〔Said, Bob: ''1983 Sailplane Directory, Soaring Magazine'', page 123. Soaring Society of America, November 1983. USPS 499-920〕 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「Nelson Dragonfly」の詳細全文を読む スポンサード リンク
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