NASA Tests Active Flow Control High Lift Slotted flaps greatly increase the lift produced by an aircraft wing for landing and takeoff, but the mechanism that deploys the surfaces protrudes into the airflow and generates drag in cruise. Simple hinged flaps avoid the drag of external fairings, but cannot generate the same increase in lift as a more complex system such as a slotted Fowler flap, which moves aft as well as down to increase wing area and camber. NASA has completed a series of ...


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