stvp

45 Imperial gallons = 54.03 US gallons. So it turns out you've never seen a 55 gallon drum either.

I had the same problem, but sometimes on the ground too. Keyboard trim will center the rudder, but will take thousands of key presses, usually about 4-5 minutes worth. Re-install the A/C, control rudder through FSUIPC and a powered USB hub seems to have fixed it.

Tutorial #2 says don't open the hatch. It's hard to close.