Big Coppitt Key, FL
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Short answer: Flybars are used to mechanically soften and stabilize the pilot's control inputs to the cyclic. RC helis will fly without 'em (just as full-size helis fly without 'em), but they're less easily controlled, especially in fast forward, fast sideways or fast backwards flight.
what is the advantage of being flybar less? I do not understand.
But with a flybarless setup, you not only have a gyro stabilizing the yaw axis (via the tailrotor) but also two more gyros (usually built into one device) -- one of which stabilizes the elevator axis and the other which stabilizes the aileron axis. And without the weight of the flybar for cyclic stabilization (which is now being done by the two extra gyros), pitch & roll (elevator & aileron) rates can increase dramatically -- and programmably -- according to how the pilot programs the controller.