I've had a Tower .46 on my Tower Trainer for the past 3 months. It has plenty of power for this airframe. I've converted the trainer to a tail-dragger. Even when the grass is "higher than desirable" on our field (2-3 inches), it still pulls through at about 1/2 throttle. Once airborne, the plane will trim out for level flight at just about 1/2 throttle.

One caveat - it probably took the better part of a gallon of 10% Omega to get it fully run-in.