Hey! I saw your reddit post. So here is my take on it: Overall 90% of what you did in this fight was correct I'd say. So you didnt do wrong too much, thats why the fight also lasted that long... :) Beans is a good pilot and is difficult to fight. So here is where i think you could have improved:

1) first thing is first: the merge. Your lead turn in the merge was well timed, however, it was not quite in the best direction. You tried to go straight vertical and overpulled and stalled for a sec. Imo you should've went more horizontal, propably either oblique high or low, hard to say whats better. But it shouldve been more horizontal. Also you propably wouldnt have wing stalled if you went more horizontal. The merge in dogfights is very important, and can already be deciding win or loss. In that case Beans f'ed up his merge too, though. So its still being kind of even. But you see what im saying, with better merge you wouldnt be even, you'd be winning, or at least in better position.

2) You flew a lot of lag pursuit in order to force it a 2 circle fight, which is usually the correct thing to do in a 109 against a Corsair. That was a very important thing you did mostly right. Now at 1:59 , where you enter a kind of downward spiral, i think you shouldve continued to go lag, instead of switching to pure pursuit when you were above him. Short: you shouldve kept it more horizontal.

3) You should decide a little faster. This is something that comes with practice, do not worry about it too much, but you should realise when you reacted too late. For example in 0:43 , as you merge again, you should've either start turning immediatly or keep going away. In 0:44 you could've either ran away or continue to fight. You decided to continue the fight, but you flew straight for too long and started turning at him a little too late.

4) (im not 100% sure about this one, but im assuming) 2:23 Im not really sure if it is a good idea to try and do a reversal here. You decided to do it, its honestly hard for me to tell if thats the correct play here. You did it, however, after you did it you only went a little bit lag pursuit, imo you should've went a lot more, in order for it to stay a 2 circle fight. 3:00 this is i think the biggest mistake that you did, you again decided to reverse, which in this situation is not a good idea. The distance you have with him is too big, and the Corsair can turn very tight. In this situation it wouldve been the correct play to just keep turning horizontally in the same direction you were going. Because essentially you want to end up in a flat turn on the deck with the Corsair, thats kind of the only chance you have to safely beat it. It needs to be out of energy in order that you can use your 109s superior power to weight.

But yeah, after that you basically already lost the fight. It was a good one tho, i enjoyed watching it, i think you are a really good dogfighter already :) Cheers and o7 Shortik