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Packard built V-1650 Merlin
The Engine That Won World War II - Jay Leno's Garage
The Packard V-1650 Merlin was a version of the Rolls-Royce Merlin aircraft engine, produced under licence in the United States by the Packard Motor Car Company. The engine was licensed in order to expand production of the Rolls-Royce Merlin for British use. The engine also filled a gap in the U.S. at a time when similarly powered U.S. made engines were not available.
The first V-1650s, with a one-stage supercharger, equivalent to the Merlin XX, were used in the P-40F Kittyhawk fighter and in Canadian-built Hawker Hurricanes. Later versions based on the Merlin 60 series included a more advanced two-stage supercharger for improved performance at high altitudes. It found its most famous application in the North American P-51 Mustang fighter, improving the aircraft's performance so it could escort Allied heavy bombers from Britain to Germany and back. - Wikipedia