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Farrar LSG-1 Bird Flight Machine
The Farrar LSG-1 Bird Flight Machine is an American, high-wing, V-tailed, single-seat, experimental research glider that was designed and built by Demetrius F. Farrar Jr. in 1969 for exploring aspects of bird flight.
==Design and development==
The LSG-1 was specially designed by Farrar for research purposes as part of a Vanderbilt University project into how birds fly and was supported by the US National Science Foundation. The aircraft's design goals included a stall speed of and a 60 foot per minute (0.30 m/s) sink rate.〔
The aircraft is of mixed construction. The fuselage is made from a sandwich of balsa and fiberglass, while the wing is of wood and Kevlar, built on an aluminium spar. Its span wing employs an unusual Wortmann FX 05-H-126 airfoil, which was originally designed for helicopter use. This airfoil section was chosen because it has zero pitching moment, which thus allows moderate torsional loads despite the resulting glider's relatively large wing area of . The LSG-1 has no glidepath control devices, such as dive brakes, making it a challenge to land. Despite its large wingspan the aircraft has a very low empty weight of , giving it a very low wing loading of 1.55 lb/sq ft (7.6 kg/m²).〔
Only one LSG-1 was built and it was registered with the US Federal Aviation Administration in the ''Experimental - Amateur-built'' category.〔〔
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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