RE: 1/5 Pepsi Chipmunk - Build
Apache supplied steel rods for 'push rods'. I used them both for individual rods to each elevator half, ie two servos for elevators...overkill I guess! Pull-pull system for rudder. Tail wheel later modified to be driven by springs off rudder control. Perceptible fish-tailing movement in flight...could it be the pull-pull system flexing and giving slight rudder movement?
For baffles I used 1/16 plywood heavily fuel-proofed.
Ron