Which component transmits engine torque to the propeller blades?

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Multiple Choice

Which component transmits engine torque to the propeller blades?

Explanation:
Torque from the engine must be carried through a part that physically connects the rotating hub to each blade root. The barrel serves as that torque-transmitting section inside the propeller hub, linking the hub to the blade roots so the rotational force moves into every blade. The spinner (and its dome) is simply an aerodynamic cover, not a torque path, while the stationary section control assembly is part of the blade-pitch change mechanism and stays fixed relative to the engine, not transmitting engine torque to the blades.

Torque from the engine must be carried through a part that physically connects the rotating hub to each blade root. The barrel serves as that torque-transmitting section inside the propeller hub, linking the hub to the blade roots so the rotational force moves into every blade. The spinner (and its dome) is simply an aerodynamic cover, not a torque path, while the stationary section control assembly is part of the blade-pitch change mechanism and stays fixed relative to the engine, not transmitting engine torque to the blades.

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