On the HTC homepage if you look in the overview section that lists the aircraft, the F4U-1D and the F4U-4 both show as having 4 20mm's but should be 6 .50's... I did not go through all the aircraft, I was just looking for specific weights on the Corsairs.
O.k. well I just went through the rest and there are quite a few boo, boo's. Didn't mean to pee in someones corn flakes... heck give me the FTP address and password and I'll make the update!