Sternpost rudder and elevator: what they have in common

1. Step 1. Sternpost rudder — is part of — Caravel. A sternpost rudder.
2. Step 2. Caravel — has part — Lateen sail. Lateen sails.
3. Step 3. Lateen sail — is a kind of — Sail. A kind of sail.
4. Step 4. Sail — works like — Tensile structure. Stretched fabric working in tension.
5. Step 5. Tensile structure — has part — Wire rope. Cables.
6. Step 6. Wire rope — is part of — Elevator. The car hangs on cables.

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