On Wednesday, October 19, 2016 at 4:09:03 AM UTC+3, BravoMike wrote:
For the sake of this discussion I have just posted my video from 2013 taken at my home Aeroklub Poznanski with a 10 m rope tow given to Jerzy Makula:

https://youtu.be/eBInTKSbq_Y

Incidentally, the rope proved to be so short that the poor girls had to push the glider by 0.5 meter to hook it up.

I'm disappointed they didn't roll inverted (or via half-loop) during initial climbout.

Maybe more power is needed?