Hi, I'm not sure if you know or not, but according to Supertigre, The ST 3000 Is the most efficient at an RPM range of 7300-7800 rpm. I don't understand why everyone is so concerened about reaching RPM's above that. If you are giving yourself a headache trying to get over 7800, you're wasting your time. I just thought i'd let you know. If you're that concerned about reaching the most RPM that you can get, try different brand props. Again, I think you're wasting your time.

I have a ST3000 swinging a 18-10 dynathrust prop at 7700. That's perfect and i'm running it on a 17lb 1/4 scale Aeronca Champ with a 9 ft wingspan and it's got TONS of authority !!

Happy flying !!