Genghis' picture reminded me of my hang-gliding tuition.
Running on a flat field (no slope) legs going like the clappers, wing pitch angle at neutral, once up to 'speed' ease the bar out and up we go, a short hop as airspeed degraded very quickly and we all end up in a big heap in the nettles/cow pats.
Happy days but it proved the point, if not with powered wheels.
