| 摘要 |
An air deflector that includes a frame, multiple airfoils, and apparatus for adjusting the angle of attack of the air deflector. The frame includes a pair of side fences. The multiple airfoils include three airfoils, each which has a negative chamber for increasing downward force and traction and extends perpendicularly laterally from one side fence to another side fence. The three airfoils are disposed in such a tandem orientation that airflow thereacross is laminar which eliminates turbulence so as to minimize boundary layer separation and eddies resulting thereby and slip caused thereby. Air flowing over a forwardmost airfoil flows through a first air space and under an intermediate airfoil and air flowing over the intermediate airfoil flows through a second air space and under a rearwardmost airfoil so as to eliminate wake formation at the trailing edges of the forwardmost airfoil and the intermediate airfoil. The forwardmost airfoil has an angle of attack that is shallow relative to the frame, the intermediate airfoil has an angle of attack that is larger than the angle of attack of the forwardmost airfoil, and the rearwardmost airfoil has an the angle of attack that is larger than the angle of attack of the intermediate airfoil so as to provide a progressively increasing angle of attack for the air deflector that gently, but progressively, diverts airflow upwardly at a controlled rate to prevent stall.
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