World's altitude record by Sikorsky S-59 (1954)
Sunday, October 17, 1954
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Description
Altitude record set by the Sikorsky S-59. Set as 24522 ft (7474.3056 m) as of 17 October 1954. Source 1: Sikorsky Archives | S-59 Source 2: Alex, Ralph. "Helicopters from 'A to Z' Part III". American Helicopter Society Newsletter, Vol. 7 1961. Page 19.
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