Hyperloop (concept) and liquid-propellant rocket engine: what they have in common

1. Step 1. Hyperloop (concept) — was inspired by — Pneumatic tube. Capsules in a tube — pneumatic post for people.
2. Step 2. Pneumatic tube — uses — Compressed air. Air pressure.
3. Step 3. Compressed air — is used in — Ramjet. The air is compressed by the oncoming flow.
4. Step 4. Ramjet — has part — De Laval nozzle. The nozzle accelerates the combustion products.
5. Step 5. De Laval nozzle — is part of — Liquid-propellant rocket engine. A nozzle.

Open Evothings