NonSAC, Thanks.
I'm told that when Kaman did a higher-harmonic control system design that went into the wind tunnel, it had a pushrod as well as a servo flap, but that might have been for other reasons.
John
It looks like NonSAC may have found what you are referring to. The mentioned patent, US 5,409,183, has leading and trailing flaps, non-swashplate hydraulic pushrod control and a higher harmonic control of the leading edge flap.
The patent even mentions electrically energized flap actuators, which are now starting to look promising. A couple of types are
piezoelectric actuators and
linear electric motors.
Dave