What phenomenon occurs when low pressure steam forms on propeller blades?

Cavitation occurs when low-pressure steam forms on the surface of propeller blades. This phenomenon happens when the pressure of the water surrounding the propeller drops below the vapor pressure, causing small vapor bubbles to form. As the propeller rotates and moves through the water, these vapor bubbles travel with the flow until they reach an area of higher pressure. At this point, they collapse or implode, creating shock waves and turbulence. This can lead to reduced efficiency and can even cause physical damage to the propeller blades over time.

Understanding cavitation is crucial for boat operators, as it can severely affect the handling and performance of the vessel. It is essential to maintain proper operating conditions by ensuring the propeller is correctly sized and the vessel is operated within its design limits to minimize the risk of cavitation.