The S-4.

 

 

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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 at the end.

The first iteration of the S-4 flew in 1949 and performed nicely. Later the cockpit was widened to include two people and it was driven by a 125 horsepower Avco-Lycoming engine. The Army lied it but felt it lacked payload capability and dropped it after the first two prototypes.

 

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The S-3, prototype to the S-4

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Screen Shot 2014-01-15 at 12.58.56 PM

Charles Seibel Explaining The Helicopter He Created To Kansas Governor Frank Carlson.

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source: wiki

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