![P-51 Mustang's Switch to Merlin Engine Made it the World-beater of World War II | Defense Media Network P-51 Mustang's Switch to Merlin Engine Made it the World-beater of World War II | Defense Media Network](https://www.defensemedianetwork.com/wp-content/uploads/2012/10/P-51s_361st_FG_July_1944.jpg)
P-51 Mustang's Switch to Merlin Engine Made it the World-beater of World War II | Defense Media Network
Why didn't the U.S. use the Rolls Royce Merlin engine in planes such as the P-40 Warhawk and P-39 Aircobra when they realized how efficient it was in the P-51 B and
![Rolls-Royce Merlin 61 Piston Aero-Engine in an RAF North-American P-51 Mustang, Stock Photo, Picture And Rights Managed Image. Pic. MEV-11954667 | agefotostock Rolls-Royce Merlin 61 Piston Aero-Engine in an RAF North-American P-51 Mustang, Stock Photo, Picture And Rights Managed Image. Pic. MEV-11954667 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/27fd9d809142c0a34bf4d66cc04b52b6/mev-11954667.jpg)