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A helicopter rotor with blades employing an NACA 8-H-12 airfoil section was tested on the Langley helicopter test tower. Tests were conducted with the blade surfaces having either a plastic filler applied or the filler removed. The filled blades, which more closely matched the true airfoil shape, showed an average reduction of 6-7% in total torque coefficients compared to the blades without filler. Further testing over a range of tip speeds also showed improved performance with the more accurately shaped fi

Author

MB-RP

Language

EN