Surfboard stringer and turbine: what they have in common

1. Step 1. Surfboard stringer — is part of — Surfboard. A longitudinal stiffening batten.
2. Step 2. Surfboard — is made of — Fibreglass. Fibreglass.
3. Step 3. Fibreglass — is material for — Jet ski. The hull is fibreglass.
4. Step 4. Jet ski — has part — Water-jet propulsion. A water jet.
5. Step 5. Water-jet propulsion — has part — Impeller. An impeller.
6. Step 6. Impeller — is part of — Turbine. The bladed wheel is the turbine’s rotor.

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