When is prop walk most noticeable?

Prop walk is most noticeable when the engine and propeller are operating in reverse because of the unique hydrodynamic forces at play. When the propeller spins in reverse, it generates thrust that not only propels the boat backward but also creates a tendency for the stern to slide sideways. This phenomenon occurs due to the interaction between the propeller's rotation and the water flow around the hull.

In this context, the force generated by the propeller is primarily directed backward, but it also creates a lateral force on the boat that causes it to "walk" or move sideways, typically in the direction of the propeller’s rotation. This effect can be significantly accentuated at low speeds when the boat is in reverse, making maneuvering more challenging, especially in tight quarters. Understanding this concept is crucial for safe and effective boat handling, especially when docking or navigating in restricted areas.

During high winds or when stationary, prop walk does not manifest as prominently, and at cruising speeds, the dynamics change, making it less noticeable. Hence, recognizing the conditions under which prop walk is most apparent is essential for boat operation and safety.