The actuator is a mechanical device used in many fields that can be powered by air, electricity, and other means and causes a motion of some kind.
On some micro RC vehicles, in place of servos to control the rudder or elevators or steering you'll find one or more lightweight actuators.
Actuators don't provide the same precise control as servos because they are either on or off but their small size and light weight makes them useful in micro vehicles such as tiny infrared cars or the tiniest of RC airplanes where traditional or even micro servos would be too large and heavy.
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