How many blades does a ship's propeller typically have?

A ship's propeller typically has five blades, which is a common configuration for many vessels. This design is significant because having five blades provides a good balance between efficiency, speed, and thrust. More blades can enhance the propeller's ability to generate thrust at lower speeds, which is particularly helpful in maneuvering during docking or slow-moving conditions.

The choice of five blades strikes a balance, as it helps to reduce cavitation—a condition where bubbles form and collapse, causing potential damage to the propeller and reduced efficiency. Fewer blades (like three or four) may be more efficient at higher speeds but can lead to increased cavitation risk and reduced thrust at lower speeds. More blades (such as six) can provide additional thrust but may introduce more drag and complexity.

Thus, the five-blade configuration is versatile and commonly used across various types of marine vessels to optimize performance under diverse operational conditions.