This year, John Plant of the Primitive Technology channel has been experimenting with all sorts of forging technologies in his wilderness encampment. In this video, he builds a volute-shaped blower. He explains:
I made a volute shaped blower where the housing for the fan is volute shaped, that is to say a widening spiral to test the effectiveness of a one way spinning impeller. The previous blower design is tear drop shaped so that the direction that the fan spins is un important. Also with the previous design the impeller spins one way and then the other as it is powered by a simple string mechanism.
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