After WWII Pratt & Whitney employes, Fredrerick B. Rentschler, Jack Horner and Bill Gwinn noticed, Pratt had made 363,619 engines during the war. Since there had been massive cut backs on orders, they had a lot of spare time, so they set out to see just how many horse power that equated to. 603,814,723 HP! More then any other manufacturer in the world. There was a good saying by the P-47 pilots, "a P-51 will get you there, but a Jug will get you home." That was a reference to the rugged P&W R2800 engine, which would take a hit to the top cylinder and keep running, a Merlin, would run out of coolant, and become a glider!