Which fixed pitch thruster configuration would cause the least power load?

The option involving six thrusters running at 15% of rated thrust each is the configuration that results in the least power load. This scenario leverages the principle of load distribution across multiple thrusters, which helps to optimize the overall efficiency of the dynamic positioning system.

When multiple thrusters are used, the power requirement is effectively spread out. Each thruster operating at a lower percentage of its rated capacity means that they can work in unison with less stress on each individual unit, maintaining a more stable and energy-efficient operation. At 15% of rated thrust, the thrusters operate well within their optimal performance range, reducing the chance of increased power consumption that can occur when a single thruster or fewer thrusters are pushed to operate at higher percentages.

In contrast, other configurations that involve fewer thrusters or higher load percentages require each thruster to work harder to achieve the necessary thrust. This can lead to greater energy consumption and increased wear on those thrusters over time, ultimately resulting in less efficient operation. The choice of six thrusters at 15% is therefore the most efficient arrangement for minimizing power load while achieving the desired position-keeping capability.