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Found this picture on the web:

Pratt & Whitney R-2000 Twin Wasp

Derived from the Pratt & Whitney R-1830, this engine started out as the X-100, the 100th PW experimental powerplant. It was designed for the Douglas DC-4 and C-54 transports, the aircraft that played the greatest role in the Berlin Airlift. The radial engine is rated at 1,450 hp at 2,700 rpm.

G5_RadialEngineHistory.jpg (209 Kb) (under photos/22/1006-08_MedBowVedauwoo/)

By Alan Silverstein, ajs@frii.com (page updated Tue Mar 10 18:16:39 MDT 2026)