The Rolls Royce Merlin was the beating heart of any number of WWII military aircraft - and would you believe that it powered the Cromwell Cruiser tank? This link is to a lecture given by one of the developers of teh Merlin engine to de Haviland technical people in late 1945. I post it here in order to preserve it. http://www.wwiiaircraftperformance.org/merlin-lovesey.pdf The Rolls Royce Merlin fitted in a Spitfire Just some of the aircraft powered by Rolls Royce Merlin engines. Avro Lancaster Hawker Hurricane Supermarine Spitfire CAC CA-18 Mustang