RE: Speed eqation

[William and Melissa Johns <gizmology-at-gizmology.net>]

And don't forget that your motor will run slower under load than free.


At 12:10 PM 8/6/2004, you wrote:
>I don't know about your motor rpm but if you know the drive wheel rpm and 
>diameter you can figure MPH with the following formula,
>
>     MPH = ((RPM x (DIA x 3.1416)) x 60) / 63360
>
>In Excel it would look like,
>
>     =((A1*(A2*3.1416))*60)/63360  where A1 is RPM and A2 is drive wheel 
> diameter.
>
>Remember diameter times Pi (3.1416) gets you your circumference.  The 
>63360 is the number of inches in a mile.
>
>For a tracked vehicle you should add the thickness (times 2) of your track 
>to the DIA variable in the equation for an accurate result.  If the drive 
>wheel is 4.5 inches in diameter and the track thickness is 1/2", add an 
>inch to DIA (5.5" for this example).
>
>Steve Tyng
>
>
>
> > Subject: Speed eqation
> >
> >
> >
> > Ok so here i am looking at my motors tring to figure out how
> > fast or slow my tank will go  ?        If i know the drive
> > wheel size is 4 1/8 " and the speed of my motor  ( x ) rpm .
> > What is the formula to figure out MPH? Do i need more info to
> > determine mph ? Thanks.
> >
> > Nick "gotta work on my typing " Barnes
> >
> >

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