Skybolt, you say?

I wouldn't put much faith in the GP Skybolt ARF manual on how to rig paired biplane ailerons.

Any time you have staggered wings on a biplane you run the risk of having screwed up throws on the slave aileron. This setup solves that problem on mine.

A 60" span biplane is a decent sized model. That might be a good reason to go with 4 servos.

Why cover the rod? Why not use shaped tube? There is shaped aluminum tubing available in LHSs already. You want to keep the weight down for sure. Surfaces are usually balanced with weight AHEAD of the hinge line to counteract flutter. Putting more weight aft of the hinge line is just the opposite. Don't think I'd use brass or an extra part (cover) or such. Go lighter and use less hardware. I'd really look harder at 4 servos.


BTW, I made the horns on my Skybolt out of the supplied horns. Cut off the base and epoxied the horn part into the aileron. Lighter, stronger, less slop, no differential throw introduced. (Elegant?)