Thanks, I will give it a try as soon as the flying weather returns and I come across a suitable student to use as my guinea pig.

Yes, I can understand that the communication part matters too. I recently bought a book called "The Flying Instructor's Patter Manual". Written by two ex-RAF flight instructors and full of example dialog for teaching various maneuvers. A lot of it is not applicable in a model aviation setting, but it gave a few new ideas and insights.

Krister