How about helping your student, who has mastered flying a Train-Air .40, with his first low-wing, a Sport-Air .40.
Said student was having a great time and flying inverted. Then, Something falls off the airplane. Hmmm... that
was the tank hatch. Something else falls off. Hmmm... piece of foam rubber. Something else falls out... there goes
the tank. Silence from the engine... as another bit of foam rudder and the Rx battery pack drop out... Said
student then hands me the transmitter(!), as he has done SOOOO many times before while learning to fly his first
airplane... Try and get out of that one!!!