Crossword Genius

Reversible blade hub? (5)

Ross

I believe the answer is:

rotor

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This clue could be a double definition.

'reversible' is the first definition.

'blade hub' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for rotor that I've seen before include "Flywheel" , "Part of electric motor" , "Turning part of a mechanism" , "Revolving aerofoil" , "Revolving part of machinery" .)

I've seen this clue in The Mirror.
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