A propeller is said to be an essential part of a boat and the efficiency of the boat depends on it. Repairing the propeller by self is not a healthy idea and it can be only done by a professional. Also, the boater must have a spare propeller with themselves so that during an emergency they can replace them without the help of professionals. For this, you should be aware of how to replace the propellers. Rather than repairing the propeller when it stops working, it is beneficial to check them from time to time for any irregularities.