The S-4.

The S-4.

by Daniel Russ on February 19, 2014

      .. The S-4 was the brainchild of Charles Seibel. It was an attempt to break into the lucrative rotorcraft market that the United States Army was creating. The idea was simplicity, a welded steel tool box frame, a double blade rotor a tapered ail boom and a twin bladed anti torque fan […]

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