"I need to make a building decision. What is the general consensus on installing aileron balances."
I am not yet flying but all of my surfaces are mass balanced. As I understand it, mass balancing a surface is just weighting it in such a way as to move its natural frequency out of the likely operating range of the aircraft. This is done to prevent flutter of the surface which can lead to structural failure before you even notice the first oscillation. In an aircraft no structural failure is acceptable. Since no two KR's of any variant are exactly the same due to the construction methods used, just because someone else doesn't mass balance a surface doesn't mean you shouldn't. Stephen Teate Paradise, Texas