Level flight performance measurements were made on the TR-4B helicopter with the original set of main-rotor blades and a gross weight of approximately 2560 pounds. The minimum shaft power required by the main rotor at cruising rpm (225 rotor rpm, 2100 engine rpm) was approximately 99 hp at a speed of 40 mph. The shaft power absorbed by the tail rotor at cruising rpm was approximately 3 to 4 hp over a range of speeds from 25 to 80 mph.


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    Title :

    Flight Tests of the Sikorsky HNS-1 (Army YR-4B) Helicopter. 1 - Experimental Data on Level-Flight Performance with Original Rotor Blades


    Contributors:

    Publication date :

    1945


    Size :

    40 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English