AEG Hubschrauber

Technical data for A.E.G.
Number of seats: 1, engine: 1 x 200hp electric motor, rotor diameter: 7.92m, weight fully loaded: 1225kg ceiling: 1000m

The A.E.G. helicopter designed by R. Schmidt in some respects resembled the Petroczy-Karman aircraft used in World War I. The A.E.G. was attached to the ground by a system of three tethering cables which helped to stabilize it so that it could be used as an observation post or, if need arose, as a support for an aerial.
It had two co-axial rotors with different diameters. The upper rotor was the larger with a diameter of 7,93 m. The helicopter was powered by a 50-shp electric engine. Test were conducted until 1936, but were then discontinued because of the power unit showing a lack of stability. New tests began in 1940. This time, both rotors had a diameter of 7.93 m, with an engine power of 50 shp. Later, this power was increased to 100 shp at 310 rotor revolutions per minute and finally to 200 shp at 450 rpm. Thus, the lifting force was increased from initially 450 kg to 1,250 kg. The co-axial contra-rotating two-bladed rotors were driven by an electric motor located between them and fed with power through the three anchoring cables attached to girder-type arms fixed above the upper rotor. These tethering girders supported the observer's cabin; in the event of engine failure, the observer escaped by using a parachute blown into the air by a powder charge. The helicopter could be transported to the point where it was to be used in a special lorry fitted with a launching stand and a control desk. , which also carried the captive harness as well as the electrical system (a voltage of 2000 volts for the helicopter engine). However, the AEG helicopter has never come into operation

Source: P.Lambermont "Helicopters and Autogyros of the World", 1958
J.R.Smith, Antony L. Kay "German Aircraft of the Second World War", 1972
H.J. Nowarra "German Helicopters 1928-1945", 1990