Balloon envelope and radar: what they have in common

1. Step 1. Balloon envelope — is part of — Blimp. A sealed envelope whose shape is held by helium pressure.
2. Step 2. Blimp — has part — Tail fins and rudder. Rudder and elevators.
3. Step 3. Tail fins and rudder — is part of — Biplane. A tailplane and control surfaces.
4. Step 4. Biplane — has part — Wing. Two tiers of wings.
5. Step 5. Wing — is part of — Jet airliner. A swept wing.
6. Step 6. Jet airliner — has part — Radar. A weather radar.

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