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I am some irritated because I had replied this but it seems deleted.
Well, I can answer your question now because "wytti" has already printed two airplanes and made several tests.
He estimates the maximum speed between 80-100km/h and the minimum speed between 15-20km/h.
He also add winglets which lets it fly "like on rails" ;-)
And I repeat it: thank you for the link to the wonderfull camera flights over botanical and zoologial reserve "Mirgorodsky".

Speedy "Red Mini Wing" RC Plane
by wytti