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.[1][2]

Hall Ibex
Role Experimental glider
National origin United States
Manufacturer Stan Hall
Designer Stan Hall
First flight 1968[1]
Status In storage
Primary user Stan Hall
Number built 1

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 (61 kg) of water ballast and a 15 m (49.2 ft) wingspan to comply with FAI Standard Class rules.[3] On one of its first flights the Ibex showed significant tail flutter. Initially Hall considered replacing the tail with a conventional empennage and tail[4] but ended up moving the ruddervator counterweights from the tips to the roots which eliminated the problem.[5]

Operational history

The Ibex was still flying in 1980 and was eventually donated to the National Soaring Museum.[6]

Aircraft on display

Specifications (Hall Ibex)

Data from Sailplane Directory[3]

General characteristics

  • Crew: one
  • Wingspan: 49 ft 0 in (15 m)
  • Wing area: 125 sq ft (11.6 m2)
  • Aspect ratio: 19.2
  • Airfoil: FX61-163 Root, 60-126 Tip
  • Empty weight: 580 lb (263 kg)
  • Gross weight: 905 lb (411 kg) 135 lbs of Water Ballast

Performance

  • Maximum glide ratio: 34:1
  • Lift-to-drag: 34
  • Wing loading: 7.25 lb/sq ft (35.4 kg/m2)
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See also

References
  1. Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 43. Soaring Society of America, November 1983. USPS 499-920
  2. Federal Aviation Administration (May 2011). "Make / Model Inquiry Results". Retrieved 10 May 2011.
  3. SSA. "Sailplane Directory". Retrieved 31 March 2011.
  4. Soaring, November 1967
  5. Soaring, October 1974
  6. National Soaring Museum (2011). "Sailplanes in Our Collection". Archived from the original on 16 May 2011. Retrieved 26 February 2011.
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