PRELIMINARY FLIGHT TEST DATA. XH-51A RIGID ROTOR HIGH SPEED FLIGHT PROGRAM
Interim rept. no. 7
ARMY TRANSPORTATION RESEARCH COMMAND FORT EUSTIS VA
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This report summarizes the flight test results of the Phase III four- bladed rotor testing on the XH-51A rigid rotor helicopter. The object of Phase III was to evaluate the four-blade rotor in comparison with the three-blade rotor. Ground tests commenced on 13 July 1964 with the first flight on 21 July 1964. The phase was terminated on 3 October 1964 after 49 flights and 14.9 flight hours.