This is actually part of my training student. After the first flight for a student they learn to trim their airplane every day at the field. I have a bunch of buddy boxes, so I can usually have a buddy box for each student (so we don't have to mess with servo reversing each session). What's really funny that most students don't catch on to why they have to retrim their plane every session. As I put away the buddy boxes each session I intentionally change their trim settings, so they have to retrim every flight. I feel that having the skills to do this makes them a better pilot down the road. They won't be afraid of doing a maiden flight because they know how to trim a plane.

Ken