My Ex-Club has bought a Scheibe SF-25 with a Rotax 100HP. They do tow with
this and it seems to work. The field is only 830m long.

I don't know if they do it on a regular basis, because normally they use a
whinch.
Here is a fotograph of the SF-25 towing a ASK-21 if I am right:

http://www.segelflug.de/vereine/gram...ik/schlepp.jpg

Sebastian
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Sebastian Fischer