HEY METALLICA JUNKIE- i like that band alot tooway COOLwill let you know the next time the SUPERCHAOSis outhave 20 planes flying so might be a while - but i am EXCITEDabout trying the 12/10 and running in the 10-11,000 RPM range and making an improvementthe CHAOSwill be a beast - (it was before ) less fuel use- less engine wear- all good stuff- nothing like running an engine in its power band- its always power to weight- for maximum performance-have to say what i have learned here has come as a complete surprise-the reason is i have some old 60 engines that will only run on 11 inch props some 61's75's running on 12/6 -and now my 61 SF running on a high pitch 12 inch propmost all the time RPMS= horse power-my basic rule does not apply to this great OS 61 SFPOWERHOUSE-WOW live and lean-from the boys on RCU