Thanks for the info, Rich! I'm beginning to think the Sundancer may not be enough airframe for a hard-working tug. Sounds like the Fuji BT64EI is almost too much engine for it. I could sub-out the wing joiners for carbon blades, and strengthen the gear legs, and put tundra wheels on it for prop clearance, and get a Bisson for it, but it still seems a bit of a mismatch. Sounds like the Sundancer would be happiest with a smaller motor, for normal sport flying and smooth aerobatics.