engine out glide start? !
In Texas I was trying to qualify to fly a grob motor glider. I was very current in gliders, and reasonably current in spam cans. But during my lesson the instructor asked me to stop the engine, and then start it again BY DIVING the aircraft! So my engine has stopped at an inconvenient height and I have to DIVE to get it going????? this went against all my instincts. Height is money in the bank for a glider pilot. One does not throw it away, but use it to choose a suitable field in which to park the glider.
So I never did qualify to fly the motor glider in the US, and to tell the truth, never wanted to fly one at home in the UK either. Most early motor gliders seem pretty feeble beasts compared to a 150 Supercub.....which has, even when towing up a glider, plenty of power. ( And if the engine fails the field chooses you!)