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USN Amphibious Utility Helicopter Competition of 1956

hesham

CLEARANCE: Above Top Secret
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From Spangenberg files,

In 1956 the USN issued a high demanding specification for a
fast amphibious utility helicopter,the contenders were Kaman,
Bell,Sikorsky,Vertol and Hiller.
The contenders were;


Kaman K-19 (single-engined) & K-20 (twin-engined)
Hiller Model-1070
Bell D-226 & D-227
Sikorsky S-62
Vertol V.80,V.81 & V.82

The winner was Kaman K-20 and built as Seasprite helicpter.
 
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