Thread: Sikorsky R-4 pics [4/6] - In this image taken in 1944, one of Langley Research Center's Sikorsky YR-4B_HNS-1 helicopters is seen in the 30 × 60 full-scale tunnel.jpg (1/1)
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Old September 6th 18, 03:19 PM posted to alt.binaries.pictures.aviation
Miloch
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Default Sikorsky R-4 pics [4/6] - In this image taken in 1944, one of Langley Research Center's Sikorsky YR-4B_HNS-1 helicopters is seen in the 30 × 60 full-scale tunnel.jpg (1/1)




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