Savonius vertical wind turbines, no brake needed?
I'm going to make a savonius vertical wind turbine with a DC treadmill motor for a back up power (very, very, very small back up power). I've made one already but it doesn't spin unless its really blowing (as in the picture). And on that one I left a rim to put a bike brake on it. So the question is do I even need a brake on savonius style vertical wind turbines? As what I have read they can't go faster than the wind. I will be wiring the turbine the same as my PV WITH OUT A DUMP LOAD, so thats why I had planed on a brake. But for my new savonius turbine I want to make I don't need one do I? Cause its not going to "freewheel" off like a normal wind generator can, right?
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