wrote:
On Thu, 12 Feb 2009 21:51:03 -0000, "Arthur2"
wrote:


"The Medway Handyman" wrote in
message m...
B&Q takes wind turbines off shelves Turbine range withdrawn from
sale after recent survey reveals they don't work as effectively as
first thought

http://www.diyweek.net/news/news.asp?id=11999





This subject has been on my mind for the past 2 days.
All wind turbines seem to be blades mounted vertically on a
horizontal axle/axis.
These can only be 100% efficient if the wind blows directly onto the
face of the blades.

If instead of blades they had the things you see on some wid speed
measurement devices
that have 3 or more cup shaped receptacles on horizontal bars fixed
to a vertical axis.

I can nly conclude that the prevalance of bladed wind turbines means
there is a basic weakness
of the wind-vane method.eg transmission of energy or torque or
something like that.

Anyone got any ideas on this?

Arthur


Coincidently this design was in the news today at a town not far from
me.
http://news.bbc.co.uk/1/hi/england/dorset/7885680.stm

ISTR the store mentioned has installed them at a number of locations.

One phone in caller made a point that possibly a better way to save
energy would be to shut the store an hour earlier .

Now that is a good point. But this is about greenwash, not saving enegy.

--
Dave - The Medway Handyman
www.medwayhandyman.co.uk