Reversible blade hub? (5)
I believe the answer is:
rotor
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" .)