Schreder Airmate HP-11

The Schreder Airmate HP-11 is an American mid-wing, V-tailed, single seat glider designed by Richard Schreder.[1][2] Airmate was the name of Schreder's design company.

HP-11
A Schreder HP-11 at the British Columbia Air Museum Victoria
Role Glider
National origin United States
Designer Richard Schreder
First flight 1962
Introduction 1962
Status Production completed
Produced 1962-66
Number built 42
Variants Bowlus BZ-1
Kohler Alpha

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.[1][2]

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.[1][2]

A total of 42 HP-11s were built from kits and plans before production was ended in favour of the Schreder HP-14.[1][2]

Operational history

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.[1][2]

In April 2011 there were 28 HP-11s registered with the US Federal Aviation Administration and three with Transport Canada.[3][4]

Variants
HP-11
Initial model, with fixed monowheel landing gear.[1][2]
HP-11A
Improved model for amateur construction from plans or kits, with a retractable monowheel landing gear.[1][2]
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).[1]
Kohler Alpha
Version with a newly designed fuselage and HP-11 wings.[1]

Aircraft on display

Specifications (variant specified)

Data from Sailplane Directory and Soaring[1][2]

General characteristics

  • 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)

Performance

  • 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)
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See also

References
  1. Activate Media (2006). "HP-11 Airmate HP Aircraft, LLC". Archived from the original on 20 August 2011. Retrieved 12 April 2011.
  2. Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 19. Soaring Society of America, November 1983. USPS 499-920
  3. Federal Aviation Administration (April 2011). "Make / Model Inquiry Results". Retrieved 12 April 2011.
  4. Transport Canada (April 2011). "Canadian Civil Aircraft Register". Archived from the original on 18 July 2011. Retrieved 12 April 2011.
  5. National Soaring Museum (2011). "Sailplanes in Our Collection". Archived from the original on 16 May 2011. Retrieved 26 February 2011.
  6. US Southwest Soaring Museum (2010). "Sailplanes, Hang Gliders & Motor Gliders". Retrieved 26 May 2011.
  7. Chico Air Museum (2012). "Aircraft Displays of the Chico Air Museum 2012" (PDF). www.chicoairmuseum.org. Archived from the original (PDF) on 22 March 2015. Retrieved 12 February 2020.
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