Why wings or blades of an electric fan is stiff?
Well some are soft on little toy fans so kids wont hurt them selfs. But main reason in cars or other fans they are still so no damage can be done to them easely, also the heat protection the harder they are the more heat they can withstand, and also produces higher level of cooling then soft blades, on planes well i guess on all things that are fan the hard blades cut better through air.
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