since your proposed mill rotates at less that the speed of the wind
it is technically a wind mill not a turbine.
it's just an opinion but i think big verticals are just now coming into there own.
of course in the right location, you can get a much bigger return from your investment from a horizontal prop type devise.
just the swept area required is daunting to most builders.
if you want to build to the scale you have described you will need to structurally alter your house .
not everyone is willing or able to do that.
lets say your house is 1,000 sq.ft.
perhaps 31 ft. per side .
if you had a flat roof and could build a mill ten ft high it would sweep 310 sq ft.
that's a nice number!
but your not going to convince anyone it's a "colonial,spanish or Victorian style"
that's ok too,
it is the twenty-first century.
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