Before you buy anything, or do a bunch of trading, please contact a club or hobby shop for some hands on analysis of what you need.

If you end up with a .61 cubic inch two stroke engine you'll probably want about a 12 ounce fuel tank. The engine manual will have a tank size recommendation. The tank will go directly behind the firewall, as close to the engine as possible.

There is usually a servo tray (plywood with rectangular holes) in the open compartment under the wing. Some models have two hardwood rails running across thefuselage and the servos get mounted to them.


If you download and print the manual to a trainer kit, it will show pictures of how the radio equipment, switches, etc are mounted. Models vary but you'll at least have something to use for guidance. Go to http://www.greatplanes.com/parts/index.html#kits and download the one for the PT-40 MkII or PT-60. The Piper J3 Cub 60 manual shows dual aileron servos mounted to hatches so they're mostly hidden inside the wing.