Final answer:
To achieve the best performance, a propeller on a high-speed boat should have three blades, a lower tip speed, and the ability to adjust the blade angle.
Step-by-step explanation:
A propeller on a high-speed boat requires several features for optimal performance. One important feature is the number of blades. Three-blade propellers are generally considered the most efficient and provide better performance compared to two or one-blade designs. Additionally, the blades should be designed to have a lower tip speed to reduce both noise and the risk of injury. Another important feature is the ability to adjust the angle of the blades. This allows the propeller to engage the water at the most efficient angle, maximizing thrust and performance.