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| In 1928 Zaschka carried out experiments with a two-rotor helicopter at Tempelhof Airport in Berlin but they were not successful. H.J. Nowarra "German Helicopters 1928-1945", 1990
| Zaschka helicopter, 22.02.2009 In 1927 Engelbert Zaschka of Berlin built a helicopter, equipped with two rotors, in which a gyroscope was used to increase stability and serves as an energy accumulator for a gliding flight to make a landing. Gliding in this case means a straight descent. He wanted to develop an efficient propeller drive. A swivelling propeller at the rear provided propulsion and rudder control. The machine was a combination of an autogyro and a helicopter.
Source: http://en.wikipedia.org/wiki/Engelbert_Zaschka |
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