A big boat needs a powerful engine to develop thrust. Consequently, it needs a propeller with a small pitch, also called a propeller drive. In short, the propeller is probably the most important part of any boat engine.

A boat engine propeller works like this: when the blade moves downwards it pushes the water downwards and backwards (similar to swimming). At the same time, the water has to move quickly behind the blade to take up the remaining space. This results in a pressure difference between the two sides of the blade. Behind the blade, there will be a positive pressure pushing, and in front of the blade, a negative pressure pulling water. These reactions take place on all blades of the propeller for each rotation of the propeller. The difference in pressure causes water to be pulled into the propeller and propelled behind it, the working principle being identical to that of a fan which pulls air back and "throws" it forward.

Therefore, the propeller, motor and everything connected to it is both pulled and pushed on the water. The propeller of a boat engine pulls water from the front through an imaginary circle that is slightly larger than its diameter. When it turns, the propeller accelerates the water being pulled and pushes it through an imaginary circle that is smaller than the diameter of the propeller itself.

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