All Rolls Royce engines are, look through the history of aviation in military and civil service Rolls Royce is always there. The Boeing 747 has Rolls Royce engines in it. They make the best engines in the world, and in the 50s they were basically the only engine worth considering accept Armstrong engines, which were also British. The Sabre had a copied Armstrong engine, and the Mig-15 had a Rolls Royce Nene engine in it.