What is it called where the blades meet the shaft?

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Multiple Choice

What is it called where the blades meet the shaft?

Explanation:
The hub is the central mounting where the blades connect to the shaft. It is the part of the propeller that holds all the blade roots and provides the bore that fits onto the shaft, transferring torque from the shaft to the blades. Blades are secured to the hub with fasteners or pins and often a key-and-keyway arrangement to prevent slipping, ensuring the rotation of the shaft drives the blades. A nut is simply a fastener used on the shaft, not the blade-to-shaft connection itself. A flange is a flat mounting surface or face, not the central mounting where blades attach. A boss refers to a raised projecting area on a wheel or gear, which is not the primary blade-root hub itself.

The hub is the central mounting where the blades connect to the shaft. It is the part of the propeller that holds all the blade roots and provides the bore that fits onto the shaft, transferring torque from the shaft to the blades. Blades are secured to the hub with fasteners or pins and often a key-and-keyway arrangement to prevent slipping, ensuring the rotation of the shaft drives the blades.

A nut is simply a fastener used on the shaft, not the blade-to-shaft connection itself. A flange is a flat mounting surface or face, not the central mounting where blades attach. A boss refers to a raised projecting area on a wheel or gear, which is not the primary blade-root hub itself.

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