How do airplane propellers work?

Answer

The shape of the airplane propellers aloud them to pull the airplane forward, and the angle of them lets it cut though the air. If they was turned around it would pull the place backwards.
source: answers.ask.com
1 Additional Answer
Ask.com Answer for: how to make a airplane propeller
How to Build an Airplane Propeller
An airplane propeller spins to "pull an airplane forward just as an airplane's wings lift it upward," according to Boeing. Though it is best to leave propeller building for passenger planes to professional aviation companies, you can build a model-plane... More »
Difficulty: Moderate
Source: www.ehow.com
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Answer They are used to propel the airplane forward to get air moving across the wings. When air moves across the wings lift is created and you take off. Another interesting note:
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