Hi Guys,
Simply put, stalling is an aerofoil section with too high and angle of attack. The excessive angle of attack results in a seperation of the laminar flow of air away from the upper wing surface. The wing surface is covered with turbulent air instead of steady smooth flowing air. Stall starts at the trailing edge and advances more and more forward as angle of attack increases until the smooth airflow spreads away from the foil over the major part of the curve and kills off the high speed airflow and therefore the lower pressure zone.
This results in equal pressure on both sides of the wing and the wing loses lift and stops driving forwards and flies backwards. By pushing the bar away, you reduce the angle of attack and re-establish a laminar flow over the upper wing surface and again resuming a low pressure area and regaining lift and forward drive.
Some kites like Flysurfer and the new Ocean Rodeo have slots in the middle of the foil section which allows air to flow through the canopy to smooth out the turbulance on the upper wing surface. Basically it reduces stalling at very high angles of attack.
This probably wont make a lot of sense unless you first undertand the theory of flight and lift theory. Start with Bernouli's theorem of air losing pressure when traveling over a curved surface at higher speed. (Venturi).
Good winds,
