@LusK it's your build not mine. Do what you want with it. :)

@RamboJutter Thanks! Could i please post the plane,and giving you the credit?

try this, you had fuel in the wings which never helps, it also had an uneven number of windows and a door only on one side and drag / mass enabled on everything, ive disabled the drag and mass on all the windows (barring one on the left, which helps with the autoroll for some reason).

Go to google and look up "SimplePlanes Auto roll"

This is a common peoblem with a small vaeiety of causes that have been exhaustively covered. If you've got any more questions after that, lemme know.