Helical bladed Gorlov type VAWT.... any experience?

 Hi all,

My house is well-sited for small scale wind energy collection, and I'd
love to toss something like a "Turby" on my roof. Unfortunately, no-one
stocks or sells small-scale VAWTs in Australia, and even those
relatively readily available overseas are still rather unfortunately
(i.e. ridiculously disproportionately) priced.

As I am pondering the merits of heading down the DIY path, I was
wondering if anyone out there has had much experience with the
aerodynamic side of things with regard to lift-type VAWTs, and helical
blade designs especially?

Cheers,
Chris

  Roof mounting is nearly always a bad idea. Something big enough to
generate power in average winds will damage your house in a storm. All
reports of real data I have seen show that HAWTs always beat VAWTs as
far as price performance ratios are concerned. For DIY
http://www.scoraigwind.com/  will lead you to all you need to know.

Chris Cole wrote:

 Verticle axis units tend to not be able to exceed about
a hundred RPM, makes it tough to link to a generator
without a gearing interface which is certainly not as
efficient as straight connection.