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What is the nacelle normally made of? 200 tons sounds pretty heavy. And the ones shown in the 2nd figure, isn't that a hub?
the nacelle houses the generator, which is very heavy as it contains loads of heavy metals (iron, copper, neodymium). The thing in picture 2 indeed is a hub, so the caption needs updating — Preceding unsigned comment added by 80.254.147.68 (talk) 09:15, 26 October 2012 (UTC)