On Apr 25, 2:39*pm, Bert TW wrote:
Our club operates a PA 180 HP with a four blade prop. Max mass of the
towed glider per flight manual is 620 kg (decreasing with density
altitude). Max mass of the PA during towing operations is 690kg.
I did look it up a couple of weeks ago to know whether it could tow an
ASH25 with two pilots - which it can't.

Oups, forgot - we're in Switzerland.