I do appreciate the input.

Well, I don't have a tach, but perhaps I may consider getting one. Engine performance is the goal.

I have always been told no smoke trail is bad, no smoke equals little to no oil, casuing engine damage and failure. Since this make perfect sense for a two stroke engine I am willling to accpt a slight performance loss if it means longer lasting engines. It would however seem appropriate that a slight performance lose should not result in no change in flight after half throttle.

If these small two strokes do deliver 75% of their power in the first half of the throttle, I would still expect some response in the last half, 25% should be at least noticable. So I will be rechecking my adjustments to make sure they are correct.

The TH 46 manuel shows several props, all in the 10x? range. It only shows one other prop of 11x6.

Based on the way this thread is leaning, I purcahsed a couple props to try and see if there was a change. They were not as big a change as I had wanted due tot he local supply store let me down in their stock, but I will advise if you are interested, in the results after I have a chance to see what happens.