Thread: Best Wheel Grip?
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Unread 23-06-2002, 22:38
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#0047 (ChiefDelphi)
  
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Re: Mu Master 2000 - follow-up question
Posted by Raul at 1/10/2001 8:01 AM EST


Engineer on team #111, Wildstang, from Rolling Meadows & Wheeling HS and Motorola.


In Reply to: Mu Master 2000
Posted by Joe Johnson on 1/10/2001 5:59 AM EST:



Here is a slightly tougher but relevent question. Where does the CG have to be to ensure that with that much friction, you will actually pull the cars and not do a wheelie. The better question is: what is the minimum ratio of the distance from the floor to the hitch vs. from the center of the back wheels to the CG? And of course the height of the CG also matters on a 14 deg incline.

Raul

: Along with this question, I have another.

: If a train weighing 130 pounds is headed up a 14 degree incline pulling two 75 pound cars, what is the mininum coefficient of friction (mu) that the train can have between its wheels and the tracks.


: My answer: .53 assuming all wheel drive -- it is worse if only one set of wheels is driving.

: Teams that plan on just driving up that sea-saw without much thought are in for a surprise!

: Joe J.





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