I geared one turbine so far using pulleys and haven't had any problems with start up, although I should of gone just a tiny bit bigger on my larger pulley because it just hit 11v at 12mph. And I only have 6ft diameter blades. But haven't had time to change it out yet. Decided to let it fly awhile to see how long it and the PVC blades last. And so far it's been over 6months and had several 50+ mph winter storms and it's still going. Only thing I bought on it was the motor for $25, everything else is just scraps. Used old saw blades for the hub some left over 4"PVC pipe for the blades, a front bicycle wheel hub for the bearings and a Push lawnmower wheel cut open for the pulley. and some scrap sheetmetal for a cover. The covers way to big and actually pushes it out of the wind slightly kinda like furling.