I've done the test flight on 2 of these, and they are sweet planes. The OS 70 or Saito 72 would be perfect. The 80 would be overkill. a 70 on a Cub is pretty overpowered, but when you throttle back to fly at scale speed, the engine sounds more scale. The only thing I would reccomend changing is the rudder throw. Give it at much as you can get. The reccomended settings weren't quite enough. Other than that, have fun!! Just remember Cubs can get a little weird on takeoff. Just remember to use the rudder on takeoff alot and if you are slow, don't pounce on the throttle.