Re: Speed eqation

["flier" <FLIER-at-sbcglobal.net>]

Hey Nick,

Circumference of the circle times the RPM.  
pi*D*RPM
3.14 * 4.125" * RPM = speed in inches/minute

There are 63,360 inches in a mile so,

(60 * (3.14 * 4.125" * RPM))/63360 gives you the 
speed in miles per hour.

At 400 RPM you're talking 5mph...

Somebody check my math!  



--- Original Message ---
From: "Nick Barnes" <npbarnes-at-sympatico.ca>
To: <tanks-at-rctankcombat.com>
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