Has anyone ever tried to rig up a variable CG? Maybe a movable weight mounted on the pre-flight CG, and use a servo to shift it fore and aft. How sensitive is the CG, would a 1oz mass moving plus and minus 1/2!QUOT! make a difference? I figure it would be easier to figure out how tail heavy you can make the plane while you're still two mistakes high. Instead of dual rates, you'd have dual CG's. Comments and criticism welcome.