Engineering:Hall Ibex
| 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 |
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]
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
- National Soaring Museum - 1 in storage[6]
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)
See also
References
- ↑ 1.0 1.1 Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 43. Soaring Society of America, November 1983. USPS 499-920
- ↑ Federal Aviation Administration (May 2011). "Make / Model Inquiry Results". http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=63P. Retrieved 10 May 2011.
- ↑ 3.0 3.1 SSA. "Sailplane Directory". http://www.ssa.org/sailplanedirectory/Default.aspx. Retrieved 31 March 2011.
- ↑ Soaring, November 1967
- ↑ Soaring, October 1974
- ↑ 6.0 6.1 National Soaring Museum (2011). "Sailplanes in Our Collection". Archived from the original on 16 May 2011. https://web.archive.org/web/20110516142717/http://www.soaringmuseum.org/collection.html. Retrieved 26 February 2011.
External links
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