I just muddied the waters -- Dan Savage answer is good advice.
More mud--- It is easy to really screw up counterbalanced (aerodynamic and static stuff )
Example - the rudders on some models have the top counterbalance increased in size -in an effort to make the rudder more effective . The "3D" boys use this.
It does - BUT in some cases the rudder will not hold center as the counterbalance tries to snatch -or self servo and cause tail wag.
a flying stab, can really cause problems if it is done in this manner (too much area ahead of the hinge point.
The STATIC balance - I mentioned was in referrence to wings w/ simple hinged ailerons and as DanSavage mentioned not really a requirement of the flying stab /stabilator stabilon(?)
what the hell do you call them