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Air Speed Calculator

Millimeters to Fractional Inches Calculator 

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Convert - A great unit conversion program by Josh Madison

 

                        Air Speed Calculator                        

The form below will calculate the speed at which a propeller will move through the air at a given RPM and Pitch.  This will give an approximate top speed and can help you decide which prop to use for a plane.  For example if your airspeed calculates to 150 MPH and your plane is a Lazy Bee, then you've got the wrong prop on your plane because there is now way that plane will do 150 MPH. (Slight exaggeration, but you get the idea.)  

The pitch of a propeller denotes the inches of forward travel per revolution.

There are 63360 inches in a mile.

There are 60 minutes in ah hour.

Airspeed is calculated as follows.

Pitch / 63360 = miles per propeller revolution

RPM * 60 = revolutions per hour

miles per propeller revolution * revolutions per hour = miles per hour

OR

63360 / 60 = 1056

RPM * Pitch / 1056 = miles per hour

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