I thought you wanted lower pressure under the wing, wouldn't that mean directing the air anywhere else but under the wing?
Tell me what I am missing here please ...
It's a bit counter-intuitive. Air pressure decreases as velocity increases, and vice-versa. Block flow to the underside of the wing and you'd be raising pressure. As seen in a venturi tube example, an open throat that narrows down accelerates the fluid velocity, and therefore pressure reduces. Endplates with a flared out forward edge and/or rear edge attempt to make use of this effect (Bernoulli's Equation), though I can't say how successfully just by looking at it.
