Road wheel and aeroplane: what they have in common

1. Step 1. Road wheel — is part of — Continuous track. Road wheels roll along the track and carry the vehicle’s weight.
2. Step 2. Continuous track — works like — Roller chain. A track is a closed chain of hinged links driven by a sprocket; the principle is that of a roller chain, on a different scale.
3. Step 3. Roller chain — is part of — Wright Flyer. The propellers were driven from the engine by bicycle chains — the Wrights were bicycle makers.
4. Step 4. Wright Flyer — is a kind of — Aeroplane. The first aeroplane.

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