First flight of a twin engined helicopter (McDonnell XHJD-1 Whirlaway)
Saturday, April 27, 1946
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Description
The aircraft was equipped with a pair of Pratt and Whitney R-985-AN-14B, air-cooled radial engines. Source: "McDonnell XHJD-1 Whirlaway", Smithsonian National Air and Space Museum web page, Last accessed 06 Feb 2019
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