If I'm understanding this right, it's a similar idea to what several F1 racing teams have been using this year, a concept that's been dubbed the "F-duct". [1]<p>The idea is that downforce on the car is generally paid for by aero drag, and thus if you want grip in the corners, you have to sacrifice straight-line speed. But what if you could aerodynamically disable that wing on the straights, so you don't suffer from the drag? (mechanically movable wings are illegal)<p>They devised a completely passive system that routes some air from the front of the car back to the rear, dumping it out behind the engine intake, just in front of the rear wing. When the driver seals the duct with his knee (or hand, in the case of Ferrari), the air can flow through this path, thus stalling out the rear wing, significantly diminishing its aero effect both in terms of downforce and drag.<p>From the video, it sounds to me like the plane is doing sort of the opposite: directing air not to stall, but to cause an aero effect over the normal surface.<p>[1] <a href="http://www.suite101.com/content/the-mclaren-f1-f-duct-how-it-works-a256163" rel="nofollow">http://www.suite101.com/content/the-mclaren-f1-f-duct-how-it...</a>