Forget acceleration at mil power - kick the WEP on and you feel every cubic inch of that 2,450 HP engine. The -4 is a BEAST.
Actually according to the charts from HTC, the -4 is LAST among the 4 I mentioned using WEP between ~2k and ~10k, of course everyone should know (now) the La-7 performance drops off at 10k. So, at 10k, the F4U-4 takes its 3rd place position back (like military power) until 14k where it becomes parallel with the P-51D. When I say parallel, I mean fairly parallel, the biggest margin in mph between the P-51D and the F4U-4 once the -4 catches the -D is 20mph at the alt of 20k. I'm repeating myself now, but, the -4 does not take over in acceleration or almost any category between these four planes until 25k. At 25K the K-4 is now tied with it for acceleration with WEP. The odd thing here, and one of my reasons for this thread to begin, was the P-51D being faster than the -4 for the majority of the envelope. I originally thought that the P-51D was a heavier bird than it is, it's ~2-3klb's lighter and even with the -4's engine I guess it can't make up for it until the air gets thin.
Summary: At first, for up to ~2k the -4 is the quickest in acceleration of the four mentioned (by a very small margin, all 4 are close together.) After 2k the La-7 and K-4 rapidly seperate themselves from the -4 and the P-51D. At 10k alt the La-7's acceleration falls off and it's now between the the remaining two, by ever decreasing margins up to 25k alt, where the -4 takes over through the rest of the ceiling.
The above is not to be construed as an argument for anything anymore, just the facts.
