Which screw is described as right-handed?

The term "right-handed screw" refers to a type of screw that is designed to tighten in a clockwise direction. In nautical terminology, the starboard screw (or propeller) is typically referred to as the right-handed screw because it operates in this clockwise manner when viewed from the rear of the vessel. This orientation is crucial as it affects the vessel's handling and maneuverability.

In contrast, the port screw is generally designed as a left-handed screw, which tightens in a counterclockwise direction. The distinction is important for operational understanding and to ensure proper handling of the vessel when both screws are in use. Having one screw as right-handed and the other as left-handed also allows for more effective maneuvering and control, particularly when both engines are operated in coordination.

Understanding this terminology helps boat crew members effectively communicate about propulsion and maneuvering, which is essential for safe and efficient vessel operation.