The Traffic Accident Reconstruction Origin -ARnews-

Re: Transmission/speed correlation

Bob Cole (rpcole@ican.ca)
Sat, 7 Feb 1998 06:19:00 -0500 (EST)

Deb:
I posted a method I use for trucks in a past archive of Taro at:
http://www.flinet.com/~bwright/ARnews/ARnews4-97/0503.html
(if the link does not work, it was the '97 archive and the topic was "Tractor trailer - Reverse Gear(s) acceleration rates").
If you follow through the method (the example I used was imperial)it will become obvious where the numbers come from instead of relying on a formula (or you will be able to see where the constant comes from in the formulas). The method also includes a way of determining the rolling radius and the rear gear ratio. If it is a car that is involved you can determine the rear gear ratio in a similar manner by putting it in neutral, raising both rear wheels and turning one wheel ten times and counting the number of drive shaft rotations. (you might be slightly out on this, but if you check the published rear end values for the vehicle, it will be close enough to confirm which one you should be using).
Bob Cole
rpcole@ican.ca

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