R-4 (航空機)
1. Sikorsky R-4The Sikorsky R-4 was a two-place helicopter designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine. The R-4 was the world's first large-scale mass-produced helicopter and the first helicopter to enter service with the United States Army Air Forces, Navy, and Coast Guard, as well as for the United Kingdom's Royal Air Force and Royal Navy.
Read “Sikorsky R-4” on English Wikipedia
Read “R-4 (航空機)” on Japanese Wikipedia
Read “Sikorsky R-4” on DBpedia
Read “Sikorsky R-4” on English Wikipedia
Read “R-4 (航空機)” on Japanese Wikipedia
Read “Sikorsky R-4” on DBpedia
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