Wing With Slotted Flaps And Spoiler Link Mechanism

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A slotted flap, differentiating it from a split flap, features a gap that allows high-pressure air beneath the wing to flow over the flap, maintaining airflow attachment and increasing lift. This design also significantly raises the velocity of air exiting the primary airfoil's trailing edge, from typically 80% of freestream speed to that of the faster, low-pressure air surrounding the leading edge of the slotted flap. Slotted flaps, which allow air passage between the wing and the flap, were developed by Handley-Page in the 1920s but became widely used later. Some models even use multiple slots to amplify the effect. While spoilers might be mistaken for flaps, they are designed to create drag and decrease lift by disrupting airflow over the wing; spoilers are larger than Gurney flaps and can be retracted. They are typically installed mid-chord on the upper surface of a wing but may also be placed on the lower surface.