Dashboard and archimedes’ screw: what they have in common

1. Step 1. Dashboard — has part — Speedometer. A speedometer.
2. Step 2. Speedometer — is part of — Cruise control. It compares with the speed reading.
3. Step 3. Cruise control — uses — Feedback control. Speed is held by feedback.
4. Step 4. Feedback control — is used in — Quadcopter (drone). The flight controller holds the position.
5. Step 5. Quadcopter (drone) — has part — Propeller. Air propellers.
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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