CG Critical
Good thread even if it is a bit of an old chestnut.
I also fly gliders and it is a very cheap way of improving basic handling skills and coordination; particularly in showing the inter-relationship between control effects. Even putting on the parachute serves to concentrate the mind on the exercises to be done.
One of the most critical things to stress is the reasons why you might get into a spin; it is not always just sloppy handling or inattention. The student needs to know how critical the loading and CG of the aircraft are in causing the full spin and especially being able to recover from it. Ironically, 2 seat aerobatic aircraft often don't have many options in this regard so it could well be that some pax aircraft are more vulnerable in this CG scenario. The anti-spin criteria for certification are for correctly loaded aircraft.
Maybe it would be easier if it was referred to (as I believe the RAF do) as 'departure from controlled flight' as I think the spin is included.
Flug