The Harmon Der Donnerschlag () is an American homebuilt aircraft that was designed and produced by Harmon Engineering of Howe, Texas. The aircraft was intended for amateur construction.Plane and Pilot: 1978 Aircraft Directory, page 142-143. Werner & Werner Corp, Santa Monica CA, 1977.
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.
The aircraft's 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 Volkswagen air-cooled engine automotive conversion, driving a two-bladed wooden propeller.
The aircraft has an empty weight of and a gross weight of , giving a useful load of . With full fuel of the payload is .
The aircraft was later developed into the Harmon Mister America.
Operational history By October 2013 there were no examples registered in the United States with the Federal Aviation Administration and none may exist anymore.
Specifications (Der Donnerschlag)
References