Sikorsky R-4B: The R-4 was the world's first production helicopter, and the U.S. Army Air Forces' 1st service helicopter. (8235) photo

A.G. Arao / noyphoto | all galleries >> Galleries >> U.S. Air Force Museum: "The Early Years" and "World War II" -- Aug. 5, 2016 > Sikorsky R-4B: The R-4 was the world's first production helicopter, and the U.S. Army Air Forces' 1st service helicopter. (8235)


05-AUG-2016

Nikon COOLPIX P7100
1/6s f/2.8 at 6.0mm iso400 full exif

other sizes: small medium original auto

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