500 guy sorry that was 2450 to 2550 so a 5 to 1 vibe from main rotor . The vibe is from the airframe not any rotating item. Vibe gets worse with speed. accelerometer on tr box. reads 0.2 ups at 60 lys 0.4 at 80 1 at 100kts and 1.2 at 120 so goes up with airspeed