Sorry I just can't get any clearer than that post. Reread number 4


There are two basic forms of elasticity in an F-18 type model that are of concern, and there are two types of mass balance that address these two forms. The most likely concern is elasticity and free play (slop) in the servo/control linkage system. In recent testing of very high quality model airplane servos including Volz metal-case, metal-gear servos, we found that there is significant free play around neutral. Furthermore, the control amplifier gain schedule near neutral is relatively soft. These two effects combine to give a relatively rubbery feel to the control surface near neutral. Note that for full size airplanes such as the F-18 the surfaces are controlled by hydraulic actuators that are extremely rigid by comparison.




And I am not sure I agree that no planes use mass balancers, you might want to check on that one, I spent one summer of my youth machining the mass balancers for the L-1011.

PS I just did a search on "mass balanced" stabilators and got several hits of full size planes with mass balancers.

PPS I am an engineer by trade, engineering by definition is "applied science". Not sure what the alternative is if you want to design something.