Driving along the A487 between Fishguard and St Davids last week I noticed a new wind turbine in a field so stopped for a look. From about 200m I was struck by quite how noisy it was. Not only was there the whoosh-thump from the blades turning but it was making a loud and intrusive whine.
I'd heard of turbines making nearby people's live miserable but never before encountered a really noisy one.
Does anyone know what causes this effect, and is it common? It was a quite large but not huge one.