Originally Posted by yyz
Didn't the Altus have a very clean, all-flying stabilizer? Seems like you could redesign the stab to also have elevator surfaces driving them with RDS on each side. Then it's "just" a matter of mixing the three servos to get the action you want.
Of course you want to keep the elevator servo (s) in the nose. There are kinematics with one or two bellcranks using one or two servos.
I made two sketches. The first one should be obvious, you use either two servos or if you use one, you adjust the leverage between bellcranks and servoarm.
The second one would work with only one bellcrank, which is offset to the rotation point of the tailplane. Owing to the offset, the elevator surface will be cambered when the incidence angle is changed.
I would need to write a little Mathematica file to optimize the geometry, but it would be doable.