I powered my Smith with a RCV 60 4 stroke. Flys great. I put a servo in the tail the elevator. I put a servo to the rear of the cockpit for rudder pull-pull. I used Harry's book for construction/alignment tips.

I also put servos in the wings for the ailerons. Other modifications included a carbon fiber landing gear. I used JR DS368 servos in order to offset the increase in engine weight. It is covered in solartex.

Enjoy the build.