I answered the trim set already
Originally posted by Murdr
It trims according to your stick input when you press the key. For instance when you are pushing forward on the stick with a bit of right roll to hold wings level, level flight, and press the trim set key. It will trim nose down, and right aeliron within trim limits to match the degree of stick input.
In other words, it will adjust trim according to your stick input at the time the trim set key is pressed.
Hint, if you trim for cruising speed, and then leave it set as is....
When you get in a fight, you'll slow down, become slightly nose heavy...
You'll likely slow down more, and get to flap deployment speed, and still be slightly nose heavy after deploying flaps...
Hence, no nose light condition to affect your gunnery.