The distribution of pressure drop around the engine with a given deflection of the fixed top flaps was the same for all flaps tested. Deflection of the fixed top flaps greatly influenced the distribution of pressure drop at low cooling-air flows but only" slightly at large cooling-air flows. The maximum average pressure drop obtained with the hinged flaps was not greatly affected by the flap chord length, the internal contour, or the hinge position within the range of cooling-air flows investigated.
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