Originally posted by Viking
True, but the difference is small.
Arguable. With the -4 the turning circles and rates are very similar.
About 750 fpm from the deck to 5k. 1-on-1 fights always end up on the deck.
Make that 12k. between SL and 12k the difference in climb rate is no more than +-750 fpm. If 750 fpm is "very little" at SL then 750 fpm is "very little" at 12k too.
The La-7 speed advantage actually increases with altitude up to 5k where the -4 starts to close the gap (at about 8k). At 5k the La-7 is doing 400+ mph while the -4 is still only doing 380ish. Above 8k the -4 is superior in speed. Again for 1-on-1 deck speed is more important than speed at altitude.
I disagree. The planes are sufficiently matched in the slow regime to make it a question of pilot skill. Let's just say that the La-7 is not known to be spoiled with an abundance of good pilots in the MA. 
But if you put a good pilot in one …
No question, the F4U-4 has a better roll rate and a more effective rudder. Speed and acceleration differences are close enough to be meaningless, unless you are running from the F4U. Even then, bullets will catch up quick enough if you're in range.
In a dogfight, sustained climb is far less important than people give it credit for. Zoom climb is a much greater factor. For example, take a 109K-4 and an A-20G. Both are doing 300 mph on the deck, with the A-20 600 yards behind the 109. Take the 109 vertical with the A-20 following. What happens? Well, the A-20 closes on the 109 and stays there for far longer than anyone would imagine. Vertical dogfighting is all about E management and E retention/momentum. Steady rate climb is generally a non factor once it becomes a maneuver fight. There is no measurable difference between the La-7 and F4U-4 in a Co-E zoom climb, at any altitude.
A five mph speed differential is as equally unimportant as steady state climb. Not enough difference by itself.
As to turning ability, these fighters are not as similar as you think. Within the plane set, the La-7 ranks 31st among the fighters. The F4U-4 ranks 16th. This difference is equal to that between the Hurricane I and the Spit I... Spitfire Mk.I had better not try to out-turn the Hurricane... It's not huge, but it is significant.
There's no question that a top tier pilot in an La-7 will beat an average pilot in the F4U-4. Heck, you don't need an La-7 to do that, any mid to late war fighter would be adequate. I would guess that 90% of the MA players have never flown a 1v1 duel against anyone. At low speed, the La-7 is far less stable than the F4U (any F4U) and cannot be pushed to the edge of its envelope without far more drama. In a 1v1 scrum, I'd take the 109G-2 over the La-7. Indeed, the G-2 is a close match for the Spit16. However, neither of these fighters can expect to beat the F4U-4, given equal pilots.
I suppose that I've dueled with or fought some of the best La-7 drivers in the game. The best I've seen is airsys (AKA 2Bighorn, Phish, airvent, Baitbug, etc). We have dueled in just about every combination of fighters possible. Several months ago we dueled with the 109G-2 vs the La-7. It was close, but the G-2 was simply better in the vertical and better when the fight became a "stall fight". The difference was very small, but the G-2 held the edge. Last night I dueled with SASKID. He had a Spit16, I had a G-2... This I would classify as dead even. SASKID had been flying Spit16 duels with Sonic23 prior, and Sonic is very, very good. For the record, SASKID needed a few sorties to find the Spit16's limits and after that was very much an even match for Sonic.
I guess what I'm trying to establish here is that I make a point of dueling with as many of the top sticks as will drop by the TA. When you get two guys of equal ability, the better fighter prevails. My experience under those rules is that the F4U-4 will win, regardless of which pilot flies it. We also know that the La-7 will usually beat the Tempest (again, given equal pilots). Within that context, the F4U-4 simply owns the Tempest after a Co-E merge.
I stand by my initial remarks. Of course, I'm always ready to have someone prove me wrong.
My regards,
Widewing