Graviman,
The reduction of control forces by locating the pitch axis of an airfoil at approximately 25% of plan-view area (25% of chord) is understood.
You said;
The horns imply that there is a mechanical connection to the rudder control at least.
Why must it be mechanical? Or, do you mean a mechanical connection without any power assist?
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For comparative purposes; here is a picture and a drawing of the of the S-69 (XH-59) rotor hub.
