"dhofstee" a écrit dans le message de
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-stick must be held in forward position so glider doesn't rotate
directly (when enough airspeed is obtained).

Err, no. Stick must be held in full aft position to insure yaw stability
during early ground roll. After that, stick must be used to take off at the
desired airspeed (either by pushing or pulling).
If this seems too difficult, don't fly solo.