I really believe that using a u is the safest way to start a plane and to adjust the engine, someone holding the plane is just another way to get hurt, using a u you do not have to worry about or tell the guy holding the plane what to do, keep your eye on the plane and engine and not on a guy holding it, that is what a u is used for, safety. also a guy at the field was turning over his gas engine with the switch turned off a guy came to hold it and it was his lucky day as the switch was not working and the engine started surprising both men, again use a u and save a hand, rollie