MikeB, I didn't say a heavier plane appears to fly better, can773 did. Dick I didn't forget about drag, And with a Buker {yugman or yugmiester?} you have far more drag than the typical TOC. My point was with any size plane there is a point where the wing loading will become too light. You may be able to do a loop in 5 feet but the airframe will no longer tumble with authority. The 1st post refers to heavier engines in heavier airframes, perhaps the misunderstanding here is the definition of "heavier".