Tests were conducted to determine the effect of rotor blade root cutout on the vertical drag of winged rotorcraft. Rotor thrust and torque were measured on isolated model rotors with blade root cutouts of 10 and 50 percent radius and were compared to the values obtained when a model fuselage and wings of three different planform areas were located below the rotor disc. Vertical drag was recorded on all airframe configurations with both sets of root cutout blades. The test data revealed a decrease in vertical drag for all airframe configurations when tested with the blades having 50 percent root cutout. The largest vertical drag reduction was measured for a small wing located high on the fuselage. The 4 percent figure of merit penalty due to 50 percent blade root cutout of the isolated rotor was diminished to 2 to 3 percent for most conditions when the reduction in vertical drag was taken into consideration. (Author)
Effect of Rotor Blade Root Cutout on Vertical Drag
1970
54 pages
Report
Keine Angabe
Englisch
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