H-2
Role Single-seat twin-rotor helicopter
Manufacturer Landgraf Helicopter Company
Designer Fred Landgraf
First flight 2 November 1944
Number built 1

The Landgraf H-2 was an American single-seat twin-rotor helicopter designed by Fred Landgraf and built by the Landgraf Helicopter Company of Los Angeles, California. Although awarded a development contract by the United States Army, it was not developed and was overtaken by more advanced designs.

Design and development

Fred Landgraf formed the Landgraf Helicopter Company in September 1943 to develop and manufacture the H-2. It had an enclosed structure for one pilot and an 85 hp (63 kW) radial engine driving two rotors, each rotor fitted to a short boom on each side of the fuselage. It had a fixed tricycle landing gear. The H-2 first flew on 2 November 1944 and the company was awarded a development contract by the United States Army. It was not developed or bought and the company ceased operations by the end of the 1940s.

Unlike conventional helicopters, the H-2 used a tension-rod drive system to drive the side-by-side rotors.[1] Control of blade pitch was also unconventional, with the blade shells rotating freely about the spars, controlled by ailerons near the tips.[2]

Specifications

Data from [3]

General characteristics

  • Crew: one
  • Capacity: 186 lb (84 kg)
  • Length: 15 ft (4.6 m) fuselage only
  • Wingspan: 12 ft 2 in (3.7 m) outrigger wings
  • Width: 29 ft 10 in (9.1 m) including rotors
  • Powerplant: 1 × Pobjoy R 7-cyl. air-cooled radial piston engine, 85 hp (63 kW)
  • Main rotor diameter: 2 × 18 ft 1 in (5.5 m)

Performance

  • Maximum speed: 100 mph (160 km/h, 87 kn)

See also

Aircraft of comparable role, configuration, and era

Related lists

References

  1. ↑ ALLWARD, MAURICE F. (14 October 1948). "Tie-Rod Transmission". Flight: 458. Retrieved 25 November 2014.
  2. ↑ "Landgraf Model H-2". Stingray's List of Rotorcraft. Retrieved 25 November 2014.
  3. ↑ Eckland, K.O. (2008-08-15). "American airplanes: La - Li". Aerofiles.com. Retrieved 2011-02-14.

Bibliography

  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.
  • The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985). Orbis Publishing. p. 2280.
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