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The S-72 was an experimental high speed compound helicopter developed by Sikorsky for the US Army and NASA. Two were built and the program ran through the mid 1980s. This S-72, at last report, is located at the Moffett Field Museum.
This photo is copyright © Bob Thomas, and may not be used or published in any way without permission.
It was added on 1 August 2022, and has since been viewed 3067 times.