Maritime & Aviation
Sikorsky R-4
The R-4 was an early helicopter produced in quantity for military service. Its single main rotor and tail rotor helped establish a practical arrangement for controlled hovering and low-speed flight.
About this artifact
The R-4 was an early helicopter produced in quantity for military service. Its single main rotor and tail rotor helped establish a practical arrangement for controlled hovering and low-speed flight.
Sources & image credits
Documented image of this machine or its operating principle; see image credits for the original date and subject.
Image: Sikorsky_R-4_USAAF.jpg
Creator: United States Army Air Forces
License: Public domain
COMMENTS (0)
Please Login to join the discussion.