What is propeller side force?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

What is propeller side force?

Propeller side force is the lateral reaction on the hull produced by the propeller’s rotation. As blades spin, they impart a swirling motion to the water behind the propeller. The ship’s stern feels a sideways push from that swirling water, causing the vessel to yaw or move sideways relative to its forward course. This is separate from the forward thrust along the propeller’s axis and is influenced by factors like propeller direction, RPM, blade design, hull form, and speed. So the effect is a sideways force on the stern due to the propeller’s rotation, not a force that moves the bow forward, increases water speed, or rotates the rudder.

Propeller side force is the lateral reaction on the hull produced by the propeller’s rotation. As blades spin, they impart a swirling motion to the water behind the propeller. The ship’s stern feels a sideways push from that swirling water, causing the vessel to yaw or move sideways relative to its forward course. This is separate from the forward thrust along the propeller’s axis and is influenced by factors like propeller direction, RPM, blade design, hull form, and speed. So the effect is a sideways force on the stern due to the propeller’s rotation, not a force that moves the bow forward, increases water speed, or rotates the rudder.

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