Helicopter arm (5)
I believe the answer is:
rotor
(Other definitions for rotor that I've seen before include "Something mechanical" , "Device to propel a helicopter" , "Turning motor part" , "Revolving part of turbine" , "Revolving aerofoil" .)
I believe the answer is:
rotor
(Other definitions for rotor that I've seen before include "Something mechanical" , "Device to propel a helicopter" , "Turning motor part" , "Revolving part of turbine" , "Revolving aerofoil" .)