I had to agree on the 4-Strokes. I have a Saito72 on mine with a 14x4w APC. That Evolution engine may be cheaper than a Saito, and I have heard its a good engine and a great price. But the price your going to pay is the weight of the engine, 26oz -- around 10oz heavier than the Saito. This is definetly a plane you want to keep light. If a Saito is out of your price range, check out some of the other 4-Strokes, Magnum and TT make nice ones at decent prices.

BTW, the Evolution .61 was on my list of engine choices for this plane.