At full power, in which condition does a thruster propeller generate the most thrust?

The condition in which a thruster propeller generates the most thrust is at bollard pull. Bollard pull refers to the maximum pulling force that a vessel's propeller can exert while stationary, such as when it is tied to a fixed point (the bollard). This condition allows the thruster to operate at its peak efficiency, as it can push against the full resistance of the surrounding water without additional influences from other factors, such as currents or vessel movement.

In open water, while the thruster has a relatively unobstructed flow, additional environmental factors like current can affect thrust generation. Similarly, in a heavy current, the flow of water can counteract the thrust generated, leading to less effective performance. While maneuvering can also be efficient due to the vessel's speed and the way the thruster interacts with surrounding water, it does not typically match the thrust available during a stationary condition, as the vessel's own motion introduces complexities that can reduce effective thrust output. Thus, under stationary conditions, the thruster's capabilities are fully utilized, resulting in maximum thrust at bollard pull.