As Bunny said, pulse proportional. The amount the rudder favored being on one side of neutral vs. the other as it flapped back and forth was proportional to the rudder stick position. See also Adams actuator, Ace Pulse Commander transmitter. Bentert actuators were smaller/lighter/weaker than even an Adams Baby.

Not on/off or right/neutral/left only, but proportional control.

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Bernard Cawley
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