Wind tunnel and archimedes’ screw: what they have in common

1. Step 1. Wind tunnel — has part — Electric fan. A fan.
2. Step 2. Electric fan — has part — Propeller. The blades.
3. Step 3. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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