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Re: what if CG was same as roll centers' axis

To: <Larrybsp@aol.com>
Subject: Re: what if CG was same as roll centers' axis
From: "James Creasy" <james@thevenom.net>
Date: Thu, 26 Jun 2003 09:46:37 -0700
so there would still be weight transfer?  why?  assuming stiff sidewall, there
is no body roll, so wouldnt all the tires still be loaded evenly?  thus no
weight transfer.

james
  ----- Original Message -----
  From: Larrybsp@aol.com
  To: james@thevenom.net
  Cc: ba-autox@autox.team.net
  Sent: Thursday, June 26, 2003 9:33 AM
  Subject: Re: what if CG was same as roll centers' axis


  Ifrom:larrybsp@aol.com (Larry Stark)



    if you lowered the CG of a car to the point where it was on the line
    connecting the roll centers, what would happen?  you would not have any
body
    roll and so you wouldnt need sway bars.




     James,
                 With the CG on the roll axis there will be no body roll and
you would  have instant weight transfer as you turned the car. The effect
would be like having no springs at all. The centrifical force of the turn
would transfer weight from the inside to outside tires in direct proportion to
the rise in centrifical force and the track.



    conversely, if you raised the roll centers so you intersected the CG,
what
    would happen?



          The effect would be the same.

           You do not want instantaneous weight transfer. It rapidly loads the
outside tire and is a very unstable condition. Its like driving on your bump
stops. In a sharp turn like an autocross the tire would probably lose traction
immediately. If you want to drive a car like this get a Go Kart. Then again
thats what you drive now:):):):).

                                                                             
           Larry



    my feeling is neither of these works well, but why?

    james

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