Where is the additional propeller assembly mounted on a turboprop?

Where is the additional propeller assembly mounted on a turboprop?

• A. On the Reduction Gear Assembly
• B. On the engine intake
• C. On the exhaust
• D. On the fuel lines

Answer: (A)

In turboprops, the propeller is driven through a reduction gear assembly. The turbine spins at very high RPM, so a gearbox lowers the output speed and increases torque to a level suitable for the propeller. The propeller hub is mounted to the output of this reduction gear, which provides the proper alignment, lubrication pathways, and structural support for the rotating assembly. Mounting the propeller on the engine intake, exhaust, or fuel lines would be inappropriate because those parts are not designed to transfer power or handle the stresses and torque of a spinning propeller, nor do they provide a proper mounting interface.

In turboprops, the propeller is driven through a reduction gear assembly. The turbine spins at very high RPM, so a gearbox lowers the output speed and increases torque to a level suitable for the propeller. The propeller hub is mounted to the output of this reduction gear, which provides the proper alignment, lubrication pathways, and structural support for the rotating assembly. Mounting the propeller on the engine intake, exhaust, or fuel lines would be inappropriate because those parts are not designed to transfer power or handle the stresses and torque of a spinning propeller, nor do they provide a proper mounting interface.