I run the CMB red head RS7 turning a 1614/3 chopper prop and it has won a few races and championships. No problems with idling around and running full out.....
I had sold my red 21 speedmaster mono with CMB21 Valvola RS-7 to good friend Kevin T He is very glad with it and it is very fast so he said big thank to me He ran it against Rob's mono so good challenge