You will find that plane to be very responsive with the upper end of the recomended power options. That keeps the overall weight down as well. Take a look at the engine options you have available and compare horsepower and weights. A two stroke example is the OS .50SX which has a great power to weight ratio when compared to most .60 sized two strokes. I recently put together a small U-Can-Do with the same basic engine recommendation you are dealing with and used the OS .50 and it did everything including great vertical perf. An engine like this will do well on that plane and keep it light as well. Of course, you will hear from the "unlimited vertical at half throttle" crowd who may have a different take on it. We have one flying at our field with an OS .46AX and a 12 3/4 x 3 3/4 APC and it does a decent job on the plane.