If you move the CG back a little and set the controls for a higher rate, this airplane will tumble and do many hot dog maneuvers, and with a computer radio it will knife edge forever (better have dual rates because it does snap with "over" control). If you read the directions, you'll notice that it calls for tail first landings - a landing on the mains results in a bounce. It slows nicely with no tendency to stall. Most people don't read far enough in the directions to notice that you don't need longer bolts for the aileron horns. You just harden the wood with CA and put wood screws into it - it holds just fine - the directions tell you how. Jim is right about being nose heavy with a larger engine. Keep it light and it will fly and land like a dream. I had to install the battery under the stab and run a wire to the front in order to balance it - but no additional weight was needed with an O.S. .61 FSR. It likes to nose over sometimes, so the most vulnerable part for me is the cowl. Try replacing the metal cowl screws with 4-40 nylon ones - easier to replace than the cowl from vibration.