"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.