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.

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, 135 lb of water ballast and a 15 m wingspan to comply with FAI Standard Class rules. On one of its first flights the Ibex showed significant tail flutter. Initially Hall considered replacing the tail with a conventional empennage and tail but ended up moving the ruddervator counterweights from the tips to the roots which eliminated the problem.

Operational history
The Ibex was still flying in 1980 and was eventually donated to the National Soaring Museum.

Aircraft on display

 * National Soaring Museum - 1 in storage