Saint,
Remember, that single "burst" he hit you with may have been a REALLY long one on his FE, or even a few short ones close together. Because of lag issues, you can't be sure on your end what actually happened. Even so, a buff is a big target, and we have some great gunners in this game. A sustainded 2 second burst into a wingtip from 6x.50 caliber would blast a wing into powder. We are not talking about a stray round or two here...
As for your question about taking off, I dont use any trim adjustments. Although it may help, I personally just ease the power on smoothly and use lots of rudder to launch my F4U. I don't generally trim until airborn and clean, at which point I engage Auto Speed for my climbout.
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Lephturn
The Flying Pigs