Thanks for that. Very interesting.
The other things that struck me...
1. You need a pretty long runway because the glider can only get as high as the runway is long - less the length of cable that the winch has drawn in to achieve the launch.
2. At the end of the launch most of the cable tension must be in the downward direction. The glider must need to be generating a phenomenal amount of lift.
3. The hook (nearly). It is scary as a spectator when you think it is about to hit you from a great height - even if it is on a drag chute.
You would treat it in a similar manner to an engine failure after take-off,
EFATO I know about. Stuff the nose down and aim for something flat. But this I envisage more like being pulled rapidly into a vertical dive with very few manouevering options.!
However I am now clearer what the procedure is. Thanks for that.