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.
Flight Tests of the Sikorsky HNS-1 (Army YR-4B) Helicopter. 1 - Experimental Data on Level-Flight Performance with Original Rotor Blades
1945
40 pages
Report
Keine Angabe
Englisch