Boat propulsions are the core components of the ship propulsion system. Their primary function is to convert the power generated by the engine into thrust, pushing the ship forward. By overcoming the resistance of the water, boat propulsions can drive the vessel forward. Common types of boat propulsions include screw propellers, paddle wheels, water jet propellers, jet propellers, ducted propellers, and flat propellers. Broadly speaking, propellers also include traditional tools driven by human or wind power, such as poles, oars, sculls, towlines, and sails.
The marine boat propeller is the most common type of boat propulsion. It generates thrust by rotating, propelling the vessel forward in the water. Marine boat propellers are usually made of metal, and the shape and angle of the blades are designed to optimize water flow and increase propulsion efficiency. The advantages of screw propellers are their efficiency and stability, making them suitable for most vessels, including cargo ships, tankers, passenger ships, etc.
The paddle wheel is an early type of propeller commonly used in steamships, typically installed on the sides of the hull. It advances the boat by rotating both wheels in the water. The use of paddle wheels has gradually decreased, but they can still be seen in some classic ships or specific types of vessels.
The water jet propeller is a type of boat propulsion that generates thrust by ejecting high-speed water jets. It works by drawing in water, accelerating it through the propeller's acceleration section, and finally ejecting the water to propel the vessel forward. Water jet propellers have features such as no exposed parts, flexible operation, and the ability to work in shallow waters, and are commonly found in speedboats and high-performance vessels.
The jet propeller is similar to the water jet propeller, but it is more commonly used in aviation and high-speed vessels. It generates thrust by accelerating airflow through the engine. Jet propellers are characterized by providing high speed and powerful thrust, making them suitable for high-speed marine navigation.
Ducted propellers are often used as auxiliary power systems in marine propulsion, especially during port operations. They are installed on the sides of the hull and are typically used for lateral or reverse movements of the vessel. Ducted propellers help more precisely control the vessel's direction, especially important when near the shore or during docking.
Different types of boat propulsions have different applicable scenarios and advantages. The marine boat propeller, as the most common boat propulsion, is widely used in various commercial vessels; whereas water jet and jet propellers are suitable for high-speed or special-purpose vessels. Whether modern mechanical propellers or traditional human and wind-powered tools, they all form an essential part of the boat propulsion system, ensuring the vessel's normal navigation and safety.
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