Disclosed is a roll wing flap deflector consisting of a roll of cloth (1) made from a durable mesh (sealed or not), or from another durable material, fixed by one side on a shaft (2), and by other side attached on a slit profile (3), which is adjustably fastened to the flap brackets. In the case the deflector is made with possibility, during deployment, of retraction or rotation of the flap, unwinding or reeling on the shaft (either automatically or by pilot) of the cloth (1) for a predetermined value, increasing or decreasing the size and curvature of cloth surface and adjusting lift of the wing as a whole.
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