I have attempted here to calculate the MAC and placed the pivot point at 25%. the 'actuator' is at the rear and the fuse and will link to the servo which will be inside. I placed some weights, as you can hopefully see, to balance the taileron, which is quite tail heavy. The question here is whether this the way to set up this surface to provide the best operation? If it matters, the surface will built up (lightening holes in the ply), sheeted, and glassed. It will be more or less symmetrical airfoil. Any thoughts? Bill S.