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Ron Eisele @ron_eisele on x 61.4K followers
Created: 2025-07-25 20:42:09 UTC
XX July 1973. First flight of the Sikorsky S-69 (73-21941), military designation XH-59. American experimental compound co-axial helicopter developed as the demonstrator of the Advancing Blade Concept (ABC).
XXX engagements
