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but how much power generation would that give me? in other words if i wanted a fan straight shaft to a generator no larger than 2 inches in diameter, is that around? and how much could it generate? and could i use multiple of those in parellel to charge a large battery?
Given even a rough estimate of 50 watts of usable energy per square foot at 60 MPH the output for a 2 inch dia blade with good aerodynamics is still only about 1.1 watts. Realistically with efficiency drops and other parasitic looses .2 watts would still be a generous value.
Why so small and what are you intending to do anyway?