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But the reason that you can fly slower in the first place is because
the flaps are down. :-) If you look at a CL curve for a wing with and without flaps you will notice that with flaps extended the curve moves up and to the left. Up and to the left. (Sorry about the JFK movie bit). So while the AOA with flaps is reduced for the overall wing, the local lift coefficient in the section with flaps extended is higher. The common belief is that downwash causes vortices which in turn increase drag. Actually, it's the wing tip vortices and vortices bound to the wing surface that deflects the airflow in the vicinity of the wing downwards, contributing to the creation of downwash and induced drag. Dave |
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