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Propellers of a boat or an aeroplane are literally a continuous inclined planes on an axle. Screws could also be described as an inclined plane on an axle. The work being done, however, is quite different: propellers push or pull a fluid - air or water. As with simple inclined planes, the incline angle is proportional - the greater the slope, generally speaking, the greater the force required to move it through the fluid. Meaning that the propeller is shaped in the form of a Wing which produces lift when it moves through the air. They are not considered a flat plane. However, some wings can be a flat plate design and produce lift.

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Q: How is a propeller an inclined plane?
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