Saddle girth and r-7 rocket: what they have in common

1. Step 1. Saddle girth — is part of — Saddle. A girth under the horse’s belly.
2. Step 2. Saddle — is part of — Bicycle. The bicycle saddle took its name from the horse saddle.
3. Step 3. Bicycle — uses — Angular momentum. The spinning wheels and the steering geometry help keep balance.
4. Step 4. Angular momentum — is used in — Gyroscope. The rotor keeps the direction of its axis.
5. Step 5. Gyroscope — is part of — V-2 rocket. A gyroscopic guidance system.
6. Step 6. V-2 rocket — evolved into — R-7 rocket. The Soviet rocket programme began by studying the V-2 (the R-1 was its copy).

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