Re: Dumb rookie mistakes
As long as the boat is not in gear and under heavy load, running with the drive trimmed way up really does not stress the U-joints all that much. Yeah, they are spinning, even in neutral, but the only loads on them in neutral are from the momentum of the gears and shafts in the drive accelerating and decelerating a bit, twice per revolution. Compare that to the stresses applied under full throttle in a tight turn, and you'll realize it's just not that big a deal. It sounds bad because you can clearly hear the rattle of the drive line lash (the slight amount of play in all the gears and shafts in the drive) being taken up in both directions twice per revolution. Also, U-joints are really cheap and easy to change so even if you did damage, that's about the best rookie mistake you could ever make...