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From: |
William and Melissa Johns <gizmology-at-gizmology.net> |

Subject: |
RE: Speed eqation |

Date: |
Mon, 09 Aug 2004 08:28:56 -0400 |

Reply-To: |
tanks-at-rctankcombat.com |

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 > > > > -- "There is not a truth existing which I fear... or would wish unknown to the whole world." - Thomas Jefferson

**References**:**RE: Speed eqation***From:*"Steve Tyng" <stevet-at-stcharlesmd.com>

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