TGDF is right. If it aint broke don't fix it.

Really, this is what this thread is all about. All the discussion about the influence of various design features on flutter and other dynamic problems really has but one outcome - don't tempt mother nature. Use this knowledge to construct sensibly designed control systems of the highest quality that you can. If after doing this you get no dynamic problems, then leave it alone. Experience shows that in the case of model airplanes, this is generally enough.

Adding mass balancers is starting at the wrong end of the solution. Yes, it will work, but you make a lot of compromises to fit them, and you really should try all the other solutions first. If at some point in trying the other solutions the airplane becomes "not broken", then this is where you stop.

The comment above about experience in the case of model airplanes relates to engineering principles accumulated over many years and found applicable to models. This needs to be considered in context. Dick, you caught me broadside in your last post when you discussed a 100g depron model. Much of the engineering we are used to in modelling does not apply to 100g models. It also does not apply to 50kg models. To analyse these models we certainly need to refer to the underlying physics and throw in some of our model engineering knowledge, but we also need to put some numbers to the results - factors which are insignificant to a 2m F3A model may be extremely important to a 100g depron model. An FAI pylon racer will usually suffer tailplane stall at the turn if the pilot is too vigorous with back stick, even using a simple balsa/foam wing. Similarly mishandling a giant scale 50kg pylon racer will have an entirely different, and much more spectacular outcome.

Separate servos on ailerons for F3A and F3B models is these days essentially a design principle. What is completely appropriate for pattern models and gliders clearly is not necessarily so for a 100g foamie. On my jet I have split ailerons with separate servos for each - 4 digital servos in total all with titanium pushrods and ball race linkages - and there are sound engineering reasons for doing this, some of which have nothing to do with aerodynamics.

It's good to discuss and understand theory. It is essential to the construction of safe airplanes and the safe flying of them. Ask the airforce why you need an aerospace degree to fly a fast jet!! But at the end of the day the theory must be mixed with experience to make it useful - neither on it's own is any use.