Tow Plane Upsets......

At 03:16 26 April 2017, Charles Longley wrote:
I am not a CFI. What would the risk be to doing that training?
Particularly
to the tow pilot?

Maybe the answer is for the instructor to release whenever the student gets
high and it is safe to do so. The student may then get the message?

Clearly some gliders are worse than others, and yes, better if in the hands of a good pilot. But even a moment's distraction can cause the good pilot to find himself/herself in a diverging and irrecoverable situation (kiting).. Whilst my suggestion to ground those gliders was slightly tongue in cheek, would that be preferable to continuing to see tug pilots "grounded" in a literal sense, with the miscreant sailing on unharmed?
The sustained force, mainly horizontal, from the rope really slows down the tug. 2-3 seconds of 700 lb force leaves the tug slow with a less effective elevator, and,as Chris Rollings noted, an elevator which may be stalled.
Sensor measuring sustained deceleration (not just a brief jerk/impulse) is maybe the measure best used to automatically jettison the rope at the tug end?