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Sikorsky HNS
The Sikorsky HNS was a two-place helicopter designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine. The HNS was the world's first large-scale mass-produced helicopter and the first helicopter used by the U.S. Navy, United States Army Air Forces (as the R-4), Navy, Coast Guard, and the United Kingdom's Royal Air Force and Royal Navy.
Evaluation spray nozzels on a U.S. Coast Guard Sikorsky HNS-1 helicopter (Bu 46445)
piloted by LT(jg) W. "Red" Bolton, in October 30, 1944.
[Source: U.S. Coast Guard]
Sources:
Wikipedia
U.S. NAVAL AVIATION RESOURCE CENTER > HELICOPTERS > PREVIOUS PAGE
