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Primitive Technology: Volute Shaped Blower
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Probably less tiring than the alternative method with pulling the strings. With the new setup you could build a little platform over the blower so you could sit on top of it and save yourself from extending your arm so much.
The biggest problem with this setup is making the blades as close as possible to the walls to reduce drag and eddys.
He says in the video or comments that this method was much more exhausting than the string method.