Armour and liquid-propellant rocket engine: what they have in common

1. Step 1. Armour — is part of — Ironclad. An armour belt.
2. Step 2. Ironclad — evolved into — Aircraft carrier. The first aircraft carriers were converted from battleships and cruisers.
3. Step 3. Aircraft carrier — has part — Steam turbine. Turbines (powered by a reactor on nuclear carriers).
4. Step 4. Steam turbine — evolved into — De Laval nozzle. De Laval invented the nozzle for a steam turbine.
5. Step 5. De Laval nozzle — is part of — Liquid-propellant rocket engine. A nozzle.

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