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![The air pressure created by the clown's lungs on the inner walls of the balloon force it to expand. (Corbis Corporation)](https://d22o6al7s0pvzr.cloudfront.net/images/bookrags/mee/mee_03_img0561.jpg)
A propeller converts through helical motion the energy supplied by a power source into thrust, a force that moves a vehicle forward in a fluid medium. They are used primarily for marine and aerial propulsion, but they are found on other technologies such as hovercraft and wind turbines as well. Propellers, which are essentially a series of twisted wings, or blades, connected to a central hub, are efficient energy transmission devices for those applications. The blades strike the air or water at a certain angle, called the pitch, and create an area of low pressure in front of the propeller. As a result, the blades generate thrust through either fluid or aerodynamic means by pushing forward through the low-pressure area. Slip, or the energy lost as the...
This section contains 2,306 words (approx. 8 pages at 300 words per page) |
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