Mine (RCGF/Aerovate 26) will turn an APC 18x6w about 7800 anytime. I've since switched to a lighter TF 18x6 to get rid of some flywheeel effect with the composite prop. I haven't had a tach on it since, but it's comparable to the APC. Not having any trouble powering the Funtana 125 at 10.5 lbs.