Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July 1983 TABLE 514.3-V. Mminal funds mental rotor source fre~. ROTARY WING MAIN ROTOR TAIL ROTOR ~ ~ (Hz.)U EI (Hz) ~ CH-3 17 OH-58A 11.8 40 OH-58D 26.3 40 UH-60 ,17 20 . CH-47D 11.3 11.3 ., CH-47C 12.3 12.3 AH-1 10.8 27.8 ,. UH-1 10.8 27.8 AH-64 19.3 23.U OH-6 31.9 51.3 CH-54 18.5 14.1 500MD UI 49 Lynx 21.7 32 24)-105 30 I J/ These frequencies are the number of rotor blades times rotor rotational speed. 2/ Rotor rotational speed. 141THOD514.3 19 July 1983 5?4.3-44