Rod Speed wrote:


"newshound" wrote in message
o.uk...
On 09/05/2021 18:49, Brian Gaff (Sofa) wrote:
How can you tell, I've no idea what your picture shows, does it have
a blade
missing and by the way why do turbines not use more blades?
Brian

Googling "why do wind turbines have three blades" will give you a
number of interesting articles.

But none that explain why the old dutch windmills had 4.
https://www.google.com/search?q=old+...mills&tbm=isch

Presumably they were slower so the drag wasnt as important.

How many horsepower does a dutch windmill generate ?

The wind turbines are currently 2MW to as much as 9MW.
2MW is over 2000 horsepower.

"How much horsepower did the average traditional Dutch windmill/wind pump generate?"

https://www.quora.com/How-much-horse...-pump-generate

"Somewhere between 40 and 60 horsepower, but youll lose a lot between
the sails and the gears. So €˜downstairs where the pump or the millstones
or the machinery was located, one would usually end up with around 16 ~ 18 hp."

So a factor of 40 or so.

Paul