Poscara helicopter being tried by French Military Commission. Each of two propellers comprises six spokes which carry wings of biplane design. Propellers revolve at 200 r.p.m.
A helicopter for military purposes
Sci. Am
Scientific American ; 124 , n 9
1921
1 Fig.
Article (Journal)
English
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Military Helicopter News - Military Market
Online Contents | 2006
Military Helicopter News - Military Market
Online Contents | 2005
Military Helicopter News - Military Market
Online Contents | 2007
Military Helicopter News - Military Market
Online Contents | 2006
Military Helicopter News - Military Market
Online Contents | 2006