John;
I wonder if this is similar to "anti-squat" geometry but applied to only one
side?
Regards, Neil Tucson, AZ
-----Original Message-----
From: John Burk [mailto:joyseydevil@comcast.net]
Sent: Monday, October 13, 2003 7:01 PM
To: land-speed@autox.team.net
Subject: Fw: rear suspention
From: "John Burk" <joyseydevil@comcast.net>
To: <ddahlgren@snet.net>
Sent: Monday, October 13, 2003 6:51 PM
Subject: Re: rear suspention
> Hi Dave . My friend Bill came up with this suspension idea in the 60's
> . Later NASCAR "copied" it . If a hypothetical rear had an input
> torque of
500
> ' # and 3:1 ratio (1500 ' # output) it would take 250 # downward on a
> 6 ' lever arm to resist pinion lift . If the lever was 2 ' off center
> (to the
> right) the 250# downward push times the 2 ' off set cancels the effect of
> drive shaft twist (equal tire loading without undesired roll stiffness) .
> ----- Original Message -----
> From: "Dave Dahlgren" <ddahlgren@snet.net>
> To: "John Burk" <joyseydevil@comcast.net>
> Cc: <land-speed@autox.team.net>
> Sent: Tuesday, October 14, 2003 4:34 AM
> Subject: Re: rear suspention
>
>
> > This sounds like a NASCAR modified rear suspension..
> > How does the math work for the offset what are the units used give
> > an
> example
> > please.
> > Dave Dahlgren
> >
> >
> >
> > >
> > > A simpler
> > > fix
> > > ; use a single torque arm a little to the right of the drive shaft
.The
> > > offset
> > > needs to be the torque arm length divided by the ring & pinion
> > > ratio .
> With
> > > this design the torque arm exactly cancels the undesirable effects
> > > of
> drive
> > > shaft torque , wheel loading stays equal under acceleration or
> deceleration
> > > and roll stiffness can be as desired . The only drawback is wheel
> loading
> > > is
> > > unequal under braking . Only the torque arm should resist axel
> > > torque (single link on each side) and only the single links should
> > > locate the rear
> front to
> > > rear . The front of the torque arm needs to be free front to rear
(slot
> or
> > > vertical link) so there is no torque arm arc to fight with the
> > > side
link
> > > arcs
> > > . Hope my description is clear enough . John
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