What is the outcome of 'cavitation' for boat propellers?

Cavitation occurs when there is a drop in pressure that creates vapor bubbles in the water around a propeller. When these bubbles move to areas of higher pressure, they collapse or implode, which can generate shock waves. This phenomenon can lead to the erosion and pitting of the propeller material over time, effectively resulting in potential damage.

The correct answer highlights the risk that cavitation poses to the structural integrity of propellers. As the bubbles collapse near the propeller's surface, the repeated impact can degrade the material and lead to costly repairs or replacements. Understanding cavitation is crucial for boat operators, as it can significantly impact the performance and longevity of the vessel's propulsion system.

While improved fuel efficiency, better steering control, and having no effect at all might sound beneficial or innocuous, they do not occur in the context of cavitation. Instead, the primary consequence is damage, making awareness of this issue essential for maintaining optimal boat operation.