For you youngsters out there, Mathman was one of the best pilots in the game, right up there with Leviathn. It didn't matter what you were flying, they would hand you your head.
There was a plan by Grumman, at one point, to install the Pratt & Whitney R2800-18w, the same engine in the F4U-4, in the Hellcat with a Hamilton-Standard hydromatic airscrew with four 6501 blades. Many sources mistakenly quote it's top speed as 417mph at 17,000 feet altitude, but its true top speed was 425mph at 25,000 feet altitude.
A pity it didn't go into full-scale production. THAT version of the Hellcat in AH would have been a handful against almost every plane in the game.