A helicopter rotor powered by ram-jet engines located at the rotor blade tips has been tested on the Langley helicopter test tower. The basic hovering characteristics of the rotor and the propulsive charac¬teristics of the ram-jet engine were obtained over a range of corrected tip speeds from 485 to 630 fps and fuel rates from 130 to 310 lb/hr per engine. The rotor was also investigated in the power-off condition and with the engines removed. Additional measurements include the determina¬tion of the effects of internal blockage and other modifications on the power-off drag of the jet engines and the determination of the lift and drag of the isolated engines in a small-scale wind tunnel.
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