A ship’s propeller is a marvel of marine engineering — a seemingly simple rotating device that plays a vital role in moving massive vessels across oceans. At its core, a ship's propeller converts rotational power from the ship’s engine into thrust, propelling the vessel forward or backward through water. A ship’s propeller works by spinning its blades to accelerate water in one direction, thereby pushing the ship in the opposite direction. Though it may appear simple, its function is governed by sophisticated physics and engineering.

Transverse thrust (also known as side thrust, asymmetric thrust and paddle wheel effect) is a phenomenon associated with the rotation of ship propellers, particularly noticeable when a ship is moving at low speeds or starting from rest. It primarily affects vessels with single-screw (single propeller) configurations.

Barry discusses the implications of transverse thrust and draws on his 25 years as a ships pilot to explain some of the ways transverse thrust is used to our advantage as well as some of the downsides of this interesting maritime phenomenon.

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