In mid 1942, Grumman recognized it needed seriously to pay attention to the production of its new F6F Hellcat fighter, therefore it contracted aided by the General Motors business to construct the Wildcat in designation FM-1. a huge selection of which went along to the Fleet Air supply while the "Martlet Mk V." General Motors next developed a better variation, called the FM-2 , which was powered by a Wright R-1820 engine with 1,350 horsepower. It showcased a taller vertical end compared to FM-1.