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 That is the cool thing: there is a bend in the blades that captures wind when it is gusty enough. There are cloth sails that they can extend too.
https://i.nostr.build/qo1FDkGFcqrHFVeE.jpg 
 Also I didnt capture a picture but the blade evolved. The dutch started out with a flat rectangular blade covered with cloth. Evolved to a slightly curved blade. Then to some weird airplane wing looking blade but with slats along it; nixed that bc too many moving parts had a high rate of needing repairs. Then settled upon the curved blade we know today.