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Join Date: Mar 2012
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# What is Difference Between Propeller and Impeller Shaft?

04/17/2012 2:41 AM

difference between propeller and other impeller

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#1

### Re: what is d difference between propeller and impeller shaft?

04/17/2012 2:59 AM

One sucks, one blows....

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Join Date: Apr 2009
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#3

### Re: what is d difference between propeller and impeller shaft?

04/17/2012 11:26 AM

"One sucks, one blows...."

If you added a squeeze and a boom cycle, you would have a four stroke engine!

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#2

### Re: what is d difference between propeller and impeller shaft?

04/17/2012 5:08 AM

A propeller is an open running device that has the function of providing a thrust force. A propeller's hydrodynamic characteristics have been described as moving almost "like a screw through wood" by marine propulsionists. If we go by definitions given in various dictionaries, a propeller is a device having a revolving hub with rotating blades to propel an airplane, ship etc. In reality, a propeller is a special type of fan with blades that convert rotational motion into a force that helps in movement forward. This is because of a pressure difference that gets created between the front and the rear surfaces of the blades. This pressure difference pushes both air and water behind the blade. This thrust or force can be easily explained with the help of Newton's laws of motion as well as Bernoulli's theorem. Propellers are made heavy use of both in aviation as well as in ships.

An impeller is always inside a casing as its purpose is to draw the liquid inside as against a propeller that provides an outward thrust and is always open. An impeller, because of its rotation and especially designed blades, increases the pressure of the fluid and thus its flow. A centrifugal pump used to draw fluid is the best example of an impeller.

Root angle, blade length, blade size, overlap and hub are very crucial components to consider in determining an impellers profile. The leading edge affects volume, pressure and hookup. The trailing edge affects RPM, bottom end acceleration and top speed. The pitch of your impeller is only what represents the measurement at the OD and nothing more. One should consider all of the above mentioned elements before choosing impeller.

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