11-8,9,10 FOR THE RF-P&SF-P'S I BELIEVE, NOT SURE OF THE RPM'S, HAVENT RUN ONE IN YEARS, i LIKED MY HANNO'S BECAUSE THEY SEEM TO HAVE MORE CONSISTANT POWER ALL THE WAY ROUND.

IF YOUR RUNNING A CONVENTIONAL PIPE IT WILL NEED TO BE RE-TUNNED WITH THE CHANGE OF THE PROP.

IF YOU WHANT TO EXPERIMENT TRY SOME OF THE BOLLY PROPS IN THOSE SIZES IT WILL PROBABLY GIVE YOU A THOUSAND OR SO MORE RPM'S THAT CF STUFF IS GREAT BUT MORE $$$$

I AM RUNNING A 12.5-12 BOLLY ON MY HANNO AND AM GETTING 10400 15% NITRO ON MY HANNO AND THE MOTOR IS TIRED AND NEEDS REBUILT!

GARY