I found this for you, I remember being quite impressed by it when it was first posted.
If you're on at the same time as Parin and you see a 109.... get ready to die.
109 film (click here) A few tips with the 109.
Late model 109s have 30mm cannons.... use it, take the time to get used to the behaviour of the rounds (they are very, very different, lots of bullet drop and a very 'slow' round.)
I've found that a convergence of 200 max on all guns (1 x 30mm and 2 x 13mm MG) works best, as you can still land hits at 600+ with the MGs to keep 'em worried)
Close in to 200 and pull the trigger. Learn how to 'lead' your round to your target, even up this close the bullet will be 'pulled' by high-g turns and such.
109s climb very well, so use this to your advantage. I can't count the number of Spits i've roped into a spiral climb, had them stall out under me.... drop in and boom.
Even 109Ks will turn very well, once you learn the art of engine and flap manipulation in the 109 (very important), you'll hang with C-hogs.
Don't dive in from way about your targets, you will compress. start your dive earlier and have a 'flatter' angle of attack.
Also, the 'K' key on your keyboard is your new best friend. This is the elevator trim button. If you get stuck in a compression dive (i.e you can't pull out becaue you're going to fast), chop your throttle and hold down that key for a few seconds (maybe a bit of rudder too to help you bleed some speed) and you should recover. You will encounter people trying to out-dive you, betting on you not knowing how to handle your aircraft and 'lawn-dart' into the ground behind them. I've shot down many, many people who try this 'move' on me. (remember, hit ctrl-x to go back to standard 'combat trim' or your elevator will stay locked up)
There are so many other things we could discuss about how to get the best out of a 109, but I haven't the time for it right now, so feel free to PM me if you've got any more 109 questions and maybe i'll see you in the MA.
Good luck
Regards
-Archaius