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The Baumgärtl Heliofly III/57 and Baumgärtl Heliofly III/59 were 1940s experimental backpack helicopters designed and built by the Austrian-designer Paul Baumgärtl. Following on from his earlier experiments with strap-on autogyros the Heliofly III/57 was powered by two Argus As 8 piston engines each driving a single-blade of the contra-rotating rotors.Nowarra, Heinz J.. Die Deutsche Luftruestung 1933-1945 - Vol.1 - AEG-Dornier. Bernard & Graefe Verlag. 1993. Koblenz. (Gesamtwek), (Band 1)
A problem with the supply of the As 8 engine forced a re-design to use one engine, powering two rotors on a common co-axial shaft, with the engine driving one rotor directly and the other through gearing to overcome the torque effects.
Specifications (16hp)
See also
References
Notes Orbis 1985, pp. 498-499
Bibliography
Nowarra, Heinz J.. Die Deutsche Luftruestung 1933-1945 - Vol.1 - AEG-Dornier. Bernard & Graefe Verlag. 1993. Koblenz. (Gesamtwek), (Band 1)
pl:Heliofly III