The Rolls-Royce Merlin is a British liquid-cooled V-12 piston aero engine of 27-litres (1,650 cu in) capacity. Rolls-Royce designed the engine and first ran it in 1933 as a private venture. Initially known as the PV-12, it was later called Merlin following the company convention of naming its piston aero engines after birds of prey. After several modifications, the first production variants of the PV-12 were completed in 1936. The first operational aircraft to enter service using the Merlin were

Rolls-Royce vs. Packard: Who Built a Better Merlin?

World's largest and most efficient aircraft engine aces first tests

The world's largest aircraft engine is now ready for testing

For Sale: A 37 Litre 2,345 hp Rolls-Royce Griffon V12 Engine