Archimedes’ screw and kite: what they have in common

1. Step 1. Archimedes’ screw — evolved into — Propeller. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.
2. Step 2. Propeller — is part of — Aeroplane. Propeller aircraft.
3. Step 3. Aeroplane — evolved from — Glider. The Wrights added an engine to a glider.
4. Step 4. Glider — evolved from — Kite. Lilienthal and Cayley studied the wing with kites and gliders.

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