Where is the propeller positioned on the main propulsion shaft?

In a typical marine propulsion system, the propeller is located at the stern of the vessel, where it can effectively convert the rotational motion from the main propulsion shaft into thrust, propelling the vessel forward. This positioning is crucial because it allows for optimal hydrodynamic performance and minimizes resistance as the vessel moves through the water.

The connection between the propeller and the main propulsion shaft is also critical. The gearbox, which is usually situated in the midsection of the propulsion system, helps adjust the speed and torque from the engine before transmitting it to the propeller. However, saying that the propeller is "on the tall shaft" misunderstands standard terminology and mechanics; the propeller does not actually sit on the gearbox but is directly connected to the shaft that extends from the gearbox to the propeller at the stern.

Choosing the correct answer involves understanding the overall configuration of the propulsion system and the purpose of each component. While the gearbox is vital for power transmission and speed control, it does not accurately represent the location of the propeller itself within the propulsion setup.