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Hall Ibex
The Hall Ibex is an experimental, American, gull winged, single seat glider that was designed by Stan Hall and first flown in 1968.〔Said, Bob: ''1983 Sailplane Directory, Soaring Magazine'', page 43. Soaring Society of America, November 1983. USPS 499-920〕 == Design & Development ==
The Ibex was designed by Hall to investigate the reduced wetted area of the pod and boom configuration, hands off spiral stability of a gull wing, and the low speed performance of wide NACA slotted flaps. It also features a V tail, of water ballast and a wingspan to comply with FAI Standard Class rules.〔(【引用サイトリンク】title=Sailplane Directory )〕 On one of its first flights the Ibex showed significant tail flutter. Initially Hall considered replacing the tail with a conventional empennage and tail〔Soaring, November 1967〕 but ended up moving the ruddervator counterweights from the tips to the roots which eliminated the problem.〔Soaring, October 1974〕
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