In the pix I posted you can see the spools and the cramped servo compartment. The rudder and elevator servos are mounted sideways, and beneath them you can see the aileron servo (a Hitech high-torque model) which drives all four ailerons via another spool. The ailerons are in a closed loop just like the full-scale Camel.

If you want to see the complete build saga, I have a "vanity web site" at [link=http://www.mts.net/~mhultin]Phil's Airplane Pages[/link] and the Camel is In My Workshop. Follow the links.

I am just finishing the painting, only have two more roundels to do on the upper wing and then clear-coat for the whole plane. Then its assembly and rigging.

Frankly, now that I have got this far I would not use this servo-driven spool method again. I just needed to modify my plans to make a longer fuselage hatch so that I could place the servos more appropriately, but I didn't realize that when I built the fuselage.