A propeller is an important part of the boat. It increases the overall performance and extends the engine lifetime. Normally, a propeller damages when they hit an obstacle. Whenever you take the boat out on the water carry a spare propeller with their required tools. The boaters must learn the basics of the propeller and able to replace the propeller in case of emergency. A certified propeller repair technician has the ability to work with design, manufacturing, developing, testing and support.
Source: underwater prop repair