Harmon Der Donnerschlag

Der Donnerschlag
Role Homebuilt aircraft
National origin United States
Manufacturer Harmon Engineering Company
Status Production completed
Variants Harmon Mister America

The Harmon Der Donnerschlag (English: Thunderclap) is an American homebuilt aircraft that was designed and produced by Harmon Engineering of Howe, Texas. The aircraft was intended for amateur construction.[1]

Design and development

Der Donnerschlag features a wire-braced shoulder-wing, a single-seat open cockpit, fixed landing gear and a single engine in tractor configuration.[1]

The aircraft's 19.5 ft (5.9 m) span wing has two beam-type spars and employs a 16% airfoil at the wing root, tapering to a 12% airfoil at the wingtip. The standard engine used is the 75 hp (56 kW) Volkswagen air-cooled engine automotive conversion, driving a two-bladed wooden propeller.[1][2]

The aircraft has an empty weight of 350 lb (160 kg) and a gross weight of 600 lb (270 kg), giving a useful load of 250 lb (110 kg). With full fuel of 10 U.S. gallons (38 L; 8.3 imp gal) the payload is 190 lb (86 kg).[1]

The aircraft was later developed into the Harmon Mister America.[1]

Operational history

By October 2013 there were no examples registered in the United States with the Federal Aviation Administration and none may exist anymore.[3]

Specifications (Der Donnerschlag)

Data from Plane and Pilot[1]

General characteristics

Performance

References

  1. 1 2 3 4 5 6 Plane and Pilot: 1978 Aircraft Directory, page 142-143. Werner & Werner Corp, Santa Monica CA, 1977. ISBN 0-918312-00-0
  2. Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". Retrieved 10 October 2013.
  3. Federal Aviation Administration (10 October 2013). "Make / Model Inquiry Results". Retrieved 10 October 2013.
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