Air brakes.... I like what they are doing. Experimenting... The engineers stated that both the 'ironing board" and the "skate board" provided the same downforce in the tunnel. Now these young men said the wing they built was lighter than the skate board. We know the mounting will take the force put on it, so with lighter ironing board, I would only guess it may wobble at 130... Both the original ironing board and the skate boards are pretty rigid. And that kind of force at that speed, it might get interesting. Doing the 1/2 miles events, on run ways, with the usual wind/cross winds etc., you can respect the aero on the cars...