Originally Posted by
Loop&Roll
I have never known a digi servo not to hum be they hitec, ko, futaba or jr. And i have owned all of these brands, i think i have about 20 servos at home... all digis...
Exactly. The hum is the sound made from the drive frequency (the motor is constantly turned on and off rather than completely on) of the servo's motor. Digital has a very high drive frequency versus and analog which is very low. The sound analogs make is just more like a vibration. Different manufacturers also use different drive frequencies so you will notice a difference in pitch between brands. Hitecs just tend to be a bit louder than many others, but it's completely normal.
Mpowerz- If you're dumping a receiver pack in 15 min then there is definitely a problem. Even running two high end digitals a 1200 receiver pack should still go 30+ minutes. The only thing that would reduce that is a bad pack (maybe it false peaked), not having the endpoints set correctly and/or binding in the linkages.