Rich beat me to it. The FM-2 "Wilder Wildcat" probably retains the world record for piston fighters. And unlike most other VFs, I'm inclined to accept the FM record almost at face value because of the nature of its mission. Air defense of CVE task groups very seldom generated the multi-multi bogey furballs common to Hellcats and Corsairs with their inevitably high claiming errors. Look at the FM's breakdown and it's a high % of "bomber" (bmber-attack) types which GENERALLY were easier to track than fighters.