World's altitude record by Sikorsky S-59 (1954)
Sunday, October 17, 1954
This is a Notable Record milestone.
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.
