Here is an aerofoil with an air slit in the front. Compressed air is released through this slit uniformly down its width.
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| Active Wing |
Air flows at high speed uniformly across the width of the wing, generating a region of low pressure. Lift develops as a result of the pressure differential above and under the wing. The good thing about this set up is that the speed of the air flow across the width of the wing is independent of its forward speed. Lift can be directly controlled by changing the speed of the compressed air. Although lift will drop as air speed under the wing increases with forward speed and the pressure underneath the wing drops. Otherwise, this wing will always have lift.
