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A fan is just 1/4 of a drone, right? Check out this lego drone that actually flies, for inspiration. The blade part in question is 89509


The easiest way to do this would be to use a motor with a high speed (or gear up a lower speed motor) and then attach one of the larger propeller elements to it. You can probably build a custom prop, but it might be challenging to build something with the proper blade angle while keeping it light and strong enough to not break apart when rotating quickly. ...

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