Well, I wouldn't exactly call it evidence. I didn't watch the video; I don't download stuff indiscriminately, as you never know what else you'll pick up with it.

But I will take ya'll's word for it that the prop does well; for THAT airplane/fuel/plug/conditions combination. My contention is that there are too many variables in your gear, my gear, etc., to proclaim any one accessory as "ideal".

And you're right; one composite prop that works well is probably more economical than several wood props. I guess I did give a slight impression of being a cheapskate; such is NOT the case. But there are two things here you're not aware of.

First, a friend has the same exact plane/engine/plug combo I have; he tried a 13x4W APC, and wasn't overwhelmed with it. He said it did okay, but seemed to allow the engine to over-rev at full throttle in any but a climbing flight condition. We don't do a lot of hovering, harriers, etc. We like to toss the models around, but do a lot of "conventional" flying as well.

Secondly, since getting the UCD/YS 91 up, I've lost a lot of interest in the YS 63/Somethin' Extra combo. So I'll continue the "experiment" when I get back around to it.

This has been an interesting thread, indeed.