Environmental Effects on Rotor Tipjet Propulsion

From Summary: The ramjet, propelled YHJ-1 Hiller Helicopter and 8RJ22 ramjets were u ed as test equipment for a general study of the problem of rotor tip-mounted jet, engines. Air flow through the helicopter rotor, and particularly in the neighborhood of the tipjet engines, has been visualized by using smoke filaments. Notion pictures were taken at speeds ranging from 64 to 1000 pictures per second, both on the whirlstand and the YHJ-1 helicopter. The pictures reveal details of the flow in the region of'he tipjet engine, as well as overall flow through the helicopter rotor in flight.