In mid 1942, Grumman respected it needed seriously to focus on the manufacturing of its amazing F6F Hellcat fighter, such that it contracted along with General Motors business to make the Wildcat in designation FM-1. numerous which went along on Fleet Air supply although the "Martlet Mk V." General Motors next developed an improved variation, called the FM-2 , which was running on a Wright R-1820 engine with 1,350 horsepower. It showcased a taller right end versus FM-1.