I have one in a Pilot-RC 30% Yak.
I got about 6400rpm on a Menz 23X8, but since then I have leaned it to the max, and have put some fuel through it. It now runs 6800-6900 on the 23X8 Menz, and is just insane in power on that plane (only 15lbs)
I do however have the disadvantage of living some 6000feet above see level, so I would like to see what this thing will do at the coast.
I am busy fixing a 30% ultimate that I flew with a RCGF 50cc, the plane was powered alright, but not good for extreme 3D. I have now fitted the 62cc on this. It will now be easier to balace due to the extra weight of the engine and I can accommodate smaller batteries. The plane will be ready by next week, when I will go to the coast to re maiden it at a fly-in......
We will see what that brings?