Schreder HP-17

The Schreder HP-17 was an American mid-wing, V tailed, single seat, experimental glider designed by Richard Schreder to test a new airfoil section.[1]

"HP-17" redirects here. For the Hewlett-Packard calculators, see HP-17B, HP 17BII, and HP 17bII+.

HP-17
The HP-17
Role Glider
National origin United States
Designer Richard Schreder
Status Sole example no longer on the US registry
Primary user Richard Schreder
Number built one

Design and development

The HP-17 was designed to test a new airfoil section, the Wortmann FX 72 MS-150A. This airfoil is a high-lift, low drag section that Scheder thought would be a good sailplane design.[1]

The HP-17 is all-metal in construction, except for its foam wing ribs. The wing features water ballast carried inside the wing spar. The wing also has full-span flaps and spoilerons in place of ailerons.[1]

Operational history

The HP-17 was given its baptism of fire in the 1973 US Nationals when Schreder flew it in the FAI 15 Metre Class. The aircraft placed 38th and thus was not deemed a success. After the competition it was not used again and Schreder tuned his attention to the much more successful HP-18 instead.[1]

The HP-17 was retained by Schreder for many years, but in April 2011 it was no longer registered, not in the National Soaring Museum and its current whereabouts are unknown.[1][2][3]

Specifications (HP-17)

Data from Soaring[1]

General characteristics

  • Crew: one
  • Wingspan: 49 ft 3 in (15 m)
  • Wing area: 113 sq ft (10.5 m2)
  • Aspect ratio: 21.4
  • Airfoil: Wortmann FX 72 MS-150A
  • Empty weight: 500 lb (227 kg) including 200 lbs (90 kg) of water ballast
  • Gross weight: 940 lb (426 kg)

Performance

  • Maximum glide ratio: 40:1
  • Rate of sink: 102 ft/min (0.52 m/s) at 40 mph (64 km/h)
  • Wing loading: 8.3 lb/sq ft (41 kg/m2) with full water ballast

See also

References
  1. Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 23. Soaring Society of America, November 1983. USPS 499-920
  2. Federal Aviation Administration (April 2011). "Make / Model Inquiry Results". Retrieved April 16, 2011.
  3. National Soaring Museum (2011). "Sailplanes in Our Collection". Archived from the original on May 16, 2011. Retrieved February 26, 2011.
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