A boat propeller is a fan mechanism that transmits power by converting rotational motion into thrust. Usually consisting of 3 or more blades, a boat prop spins around a central shaft to create dynamics similar to a rotating screw or airfoil. When blades spin, a pressure difference between the forward and rear surfaces is produced, accelerated the water behind the blade to create force. ![image](https://img.esteem.ws/86dowmxw4p.jpg)