ROLLS ROYCE MERLIN
The Rolls Royce Merlin. The initla development engine started with a horsepower rating of 760BHP. By then end of its development some were pushing 2600 horsepower. Nearly 3.5 times more power. It is still loved by all those who hear it and propelled some of the best aircraft of WW2, the Mosquito, Spitfire, Hurricane, P51 and lancaster.