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

1. Step 1. Wind turbine — has part — Neodymium magnet. Direct-drive generators.
2. Step 2. Neodymium magnet — is part of — Electric car. Synchronous traction motors use neodymium magnets.
3. Step 3. Electric car — has part — Reduction gear. A single-speed reduction gear usually replaces the gearbox.
4. Step 4. Reduction gear — is part of — Turboprop. A propeller gearbox.
5. Step 5. Turboprop — has part — Propeller. A propeller.
6. Step 6. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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