Military Helicopters of World War I & World War II
Sources:
WW1 Helicopters –
Papin & Rouilly Gyroptere a french Monocopter designed between 1910 and 1915 by Alphonse Papin and Didier Rouilly .
The PKZ-1 & PZK-2 were experimental Austro-Hungarian Helicopters designed between 1917 and 1918
Papin & Rouilly Gyroptere French Monocopter from 1915 -
&_Rouilly
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