Detail drawings and description of Sikorsky YR-4, first helicopter in world to reach stage of commercial production; power unit is 165-hp Warner Super Scarab air cooled 7-cyl radial airplane engine; notes on model R-5 also given.
Sikorsky developments
Aeroplane
Aeroplane ; 67 , n 1738
1944
4 pages
Aufsatz (Zeitschrift)
Englisch
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Sikorsky. The sikorsky "guardian."
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