Which mode describes a vessel acting as a displacement hull at slow speeds?

A vessel in displacement mode operates by pushing water aside as it moves, which creates a wave as part of its movement through the water. This mode is typically associated with slower speeds and involves the hull being fully submerged, allowing it to move efficiently through the water while maintaining stability.

In displacement mode, the vessel's weight and hull shape determine its speed and ability to move through the water. The energy requirement increases significantly with speed because the vessel's resistance to movement increases. Therefore, this mode is efficient for slower, heavier boats that are designed to navigate with stability rather than speed.

In contrast, planing mode is achieved at higher speeds where the hull rises partially out of the water, reducing drag and increasing speed, which does not apply at slow speeds. Plowing mode, while it can be a transitional phase, generally describes movement where the hull is not fully planing or displaced but rather pushing through the water at moderate speeds. Sailing mode pertains to vessels that utilize wind to propel themselves, which does not relate to the context of displacement hulls.