Re: [DML] Re: PDC's Redesigned Trailing Arm Attachment

["Dave Swingle" <swingle@xxxxxxxxxxx>]

The Pearce design uses a Heim  (a.k.a. spherical rod end) that actually allows movement in all directions - like a ball joint. 

The Bauerle setup is more like you describe - it actually puts a certain amount of additional stress on the trailing arm itself and the bushing. Look closely at the geometry as the arm moves thru its arc - there's a reason Lotus did not capture the outside of the trailing arm bolt. In the original design it HAS to move around a bit at the end with the nut on it. 

The Pearce design is completely different. It is also not compliant (i.e. there is no rubber in it at all) so it's logical to assume that the car will ride a bit harder in the back, and having driven one, it does. 

Dave 



----- Original Message ----- 
From: "Marc Levy" <malevy_nj@xxxxxxxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Sunday, October 17, 2004 9:46 PM
Subject: Re: [DML] Re: PDC's Redesigned Trailing Arm Attachment


> When I looked at the design of the trailing arm, I too
> thought it made more sense to have a double sheer
> setup just like PDC now offers.
> 
> However, I tend to assume that the engineers working
> for lotus know more than I do about suspension design.
>  The PDC design only allows the arm to rotate around
> the bolt.  Isn't it possible the design requires the
> additional movement it has with the give of the rubber
> bushing in the "stock" design?  
> 
> 
> --- tobyp@xxxxxxxxxxxx wrote:
> 
> > 
> > 
> > 
> > Bill and List - Yes, I have studied the PDC design,
> > and it is much 
> > more robust, as you suggest.  The key with his
> > design is to load up 
> > the bolt in double shear, which means that both ends
> > are supported, 
> > and the load is applied in the middle.  This
> <SNIP>
> 
> 
> 
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[Non-text portions of this message have been removed]






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