The Toroidal Propeller: The Pinwheel-Inspired Innovation for Marine Engines
The adjective “toroidal,” which literally means ring-shaped, seems purposefully chosen to evoke mysterious and complex geometries. And yet, a toroidal propeller can be made quite simply using a sheet of paper, scissors, and a pin: many of us played with one as children, attaching it to a stick and running around to make it spin. It’s called a pinwheel
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