In mid 1942, Grumman recognized it had a need to focus on the production of its brand new F6F Hellcat fighter, so that it contracted aided by the General Motors business to construct the Wildcat in designation FM-1. numerous which went along on Fleet Air supply as the "Martlet Mk V." General Motors next developed a much better variation, called the FM-2 , that was powered by a Wright R-1820 engine with 1,350 horsepower. It showcased a taller straight end versus FM-1.