High Quality Content by WIKIPEDIA articles! The Packard V-1650 was a liquid cooled 27 litre (1649 in3) 60° V12 piston aircraft engine variant of the Rolls-Royce Merlin produced under licence (in the United States) by the Packard Motor Car Company. The engine was licensed in order to provide a 1500 hp-class design at a time when US engines of this rating were not considered ready for use even after years of development.