Ammo, if I've understood the climbing chart correct, it states that the maximum climb rate of the F4u-4 was 4800 feet/min, which is, afaik very wrong.
The Initial climb rate for the F4u-4, acording to my sources and foremost a very exelent book from the "Warbird tech Series", "Volume 4: Vought F4u Corsair" the maximum climb rate of the F4u-4 was 3870 feet/min, it's also suported by
this internet site amongst others.
The only production F4u to reach climb rate over 4000 feet/min was the post war F2G-2 which reached 4,400 feet/min however it was slower then the F4u4. max speed of F2G-2 was 431 mph at 16,400 feet.
The F2G-2 was made due to the navy wanted a fast climbing fighter that could get to altitude fast and engage kamikaze attack planes.
Not sure, but as far as I understand, and the sources I have, it seems to be a myth that the U4 could climb with 4,800 feet per minute.
Not an attack on you Ammo.