I don't want to offend anyone, but if you're a Robbie instructor, and you can't do a successful auto during takeoff, then maybe you shouldn't be a Robbie instructor. The chances of an engine failure during takeoff are probably higher than at any other time, and you have to be able to deal with it just as you have to be able to deal with it in cruise flight. Turning a student loose to solo, who has never been shown an engine failure during takeoff seems to me to show less than perfect judgment. I've never flown a Robinson, but I have flown TH55s and AS350s, and they lose rotor RPM in a heartbeat. You have to learn to deal with it, though.