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Ref : S03101
Theme :
Aviation-NASA aircrafts-Prototypes (1538 images)
Title : Sikorsky HNS-1 (YR-4B)
Caption :
One of Langley's Sikorsky YR-4B/HNS-1 helicopters is seen in the 30 x 60 Full Scale Tunnel. The technician is setting up camera equipment for stopped-action rotor-blade photos. Sikorsky built hundreds of R-4 helicopters during World War II. It was the first mass-produced helicopter.
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