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A propeller shaft is used to turn a propeller on watercraft, taking rotation and torque from the engine and feeding it to the propeller. Engineers aim to create a strong, durable, and light shaft, while considering the environment it will be used in. The propeller generates enough thrust to make a heavier-than-air object fly.
A propeller shaft is a shaft used to turn a propeller on a watercraft, such as a ship or plane. The prop shaft, as it is also known, takes rotation and torque from the engine and feeds it to the propeller, causing it to spin at a speed that can be controlled by the ship’s operator. Support shafts vary widely in length, width, and composition, depending on where and how they are used. Stores that stock replacement parts and power equipment for boats such as boats tend to carry prop shafts and may also order special shafts upon customer request.
When designing a prop shaft, engineers want to create a shaft that is strong and durable, yet as light as possible, because the weight on the shaft can impede its efficiency. The need to balance weight against strength can be difficult with some materials, especially when considering the additional weight accessories can create to the support shaft, as the device may need accessories to allow the propeller to run at an angle.
Another consideration is the environments where it will be used. On airplanes, a bearing shaft can get very cold, and these can be dangerous with some metals. Metal can shrink in the cold, which could interfere with function, and cold can make some metals brittle, which could lead to a propshaft breakage. Obviously, one doesn’t want a support shaft to break while in the air.
On ships, corrosion is a concern. Vessels designed for saltwater navigation must have support shafts that can resist corrosion, and the design must also be easy to inspect and maintain. Boats used in freshwater are less subject to corrosion, which means they can be made from a wider range of metals, including metals that are cheaper and easier to work with.
Motion from the propeller shaft, when transmitted to the propeller, allows the propeller to rotate, with rotation creating thrust. The amount of thrust can be influenced by the speed and angle of the propeller, both of which can be adjustable. On a boat, a propeller acts similar to a rowing machine on steroids to move the boat through the water. The physics behind propeller flight is quite interesting, as the propeller generates enough thrust to make a heavier-than-air object literally fly.
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