Hydraulic cylinder and kite: what they have in common

1. Step 1. Hydraulic cylinder — is part of — Retractable landing gear. Retraction cylinders.
2. Step 2. Retractable landing gear — is a kind of — Landing gear. Landing gear.
3. Step 3. Landing gear — is part of — Aeroplane. Landing gear.
4. Step 4. Aeroplane — evolved from — Glider. The Wrights added an engine to a glider.
5. Step 5. Glider — evolved from — Kite. Lilienthal and Cayley studied the wing with kites and gliders.

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