Schreder Airmate HP-11
|National origin||United States|
Design and development
The HP-11 (HP stands for high performance) was designed to compete in the FAI Open Class in the 1962 US Nationals and represented the designer's continued pursuit of the perfect competition sailplane.
The HP-11 is an all-metal design, with a wing that features a 26:1 aspect ratio, a 52 ft (15.8 m) wingspan and a NACA 65 (3)-618 airfoil, the same airfoil that had been used on the HP-8 and HP-10.
Flying the HP-11 in the 1962 US Nationals, Schreder came in third in the competition and had the longest flight, 469 mi (755 km). Schreder also flew it to third place in the Open Class at the 1963 World Gliding Championships held at Junín, Buenos Aires Province, Argentina. At that event Schreder flew a 382 mi (615 km) flight.
- Initial model, with fixed monowheel landing gear.
- Improved model for amateur construction from plans or kits, with a retractable monowheel landing gear.
- Bowlus BZ-1
- Version designed by Michael Bowlus with the front fuselage from a North American F-86 Sabre drop tank, the tail from an HP-18 and the wings from an HP-11. The wingspan was reduced to 15 m (49.2 ft).
- Kohler Alpha
- Version with a newly designed fuselage and HP-11 wings.
Aircraft on display
Specifications (variant specified)
- Crew: one
- Wingspan: 52 ft 0 in (15.85 m)
- Wing area: 104 sq ft (9.7 m2)
- Aspect ratio: 26:1
- Airfoil: NACA 65 (3)-618
- Empty weight: 400 lb (181 kg)
- Gross weight: 650 lb (295 kg)
- Maximum glide ratio: 37:1 at 55 mph (89 km/h)
- Rate of sink: 108 ft/min (0.55 m/s) at 50 mph (80 km/h)
- Wing loading: 6.25 lb/sq ft (30.5 kg/m2)
- Activate Media (2006). "HP-11 Airmate HP Aircraft, LLC". Retrieved 12 April 2011.
- Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 19. Soaring Society of America, November 1983. USPS 499-920
- Federal Aviation Administration (April 2011). "Make / Model Inquiry Results". Retrieved 12 April 2011.
- Transport Canada (April 2011). "Canadian Civil Aircraft Register". Retrieved 12 April 2011.
- National Soaring Museum (2011). "Sailplanes in Our Collection". Retrieved 26 February 2011.
- US Southwest Soaring Museum (2010). "Sailplanes, Hang Gliders & Motor Gliders". Retrieved 26 May 2011.