American Sikorsky XB-4 helicopter
Sikorsky XB-4 prototype, the first mass-produced American helicopter, operational as of 1943
Size: 1780px × 1312px
Photo credit: © Photo12/Collection Bernard Crochet / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: &, /, air, airplanes, american, helicopter, helicopters, land, sea, sikorsky, transportation, xb-4
