The Rolls-Royce Merlin is the most recognisable aero engine in the world. It powered the Battle of Britain aircraft, the Spitfire and Hurricane, as they defended the shores of Britain against the ...

A British idea transforms the struggling Mustang: replacing its weak Allison engine with the powerful Rolls-Royce Merlin. The result is a revolution. The new P-51B, with incredible range, speed, and ...