2. The combination of an aerofoil including a leading edge and a trailing edge, and a vane member, said vane member comprising a pair of sections hinged together, means to pivotally secure one of said vane sections to said aerofoil so that said one section may fold upon the aerofoil, said wing having a channel extending there‐through, said channel including an opening close in advance of said vane whereby the vane when in open position increases the air flow through said channel, said channel having an exit in the rear of said vane, and means to swing said vane member outward from a position upon the aerofoil.
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