What is downwash and upwash in airfoil? - Quora

Answer (1 of 4): The wingtip vortices create both upwash and downwash; The downwash lies within the wingspan and affects the wing angle of attack while the upwash region lies outside the wingspan and can be utilized by another aircraft (or bird) flying behind and above the wing. see below diagram

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What is downwash and upwash in airfoil? - Quora