On Tuesday, June 17, 2014 6:46:14 PM UTC+12, Andrew wrote:
I was worried by writers in this thread who have mentioned
aerotowing at sites where a straight ahead landing from a low PT3
could not be safely made. Single-engine power pilots often accept
catastrophic risks (e.g. from engine failures) but we glider pilots
don't have to. If the PT3 danger is only to the glider, I guess that's
ok, if the owners and their insurance company have no objection.
But if personal injury is risked by PT3, I hope everyone agrees that
such sites should not be used for aerotowing gliders.

I disagree.

Options in the event of a tow failure include:

1) land ahead
2) land cross wind
3) do a (approx) 180 and land downwind
4) do a (approx) 180, enter an abbreviated downwind leg, land crosswind
5) do a (approx) 180, enter an abbreviated downwind leg, land upwind
6) do a (approx) 180, do a normal downwind leg, land upwind

As long as at least *one* of those options is available at all times the site is fine.

Which ones are appropriate does change according to conditions. For example 3) is likely to be a bad idea in all but the lightest winds. But as the wind strength picks up the opportunities for the others increases quickly.