I've run a TBM 26x8 at 6300 rpm, my friend has a 3W 26x8 that turns 6500 rpm. The odd thing is the planes and engines are the same only the props are different and mine is faster in the air. I now have a 22x10 3 bladed Biela CF flies about the same as the 26x8 prop except the down lines the prop slows the plane much more, but if I tached it I don't remember the rpms.