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Re: Rear suspension

To: rgribble <rgribble@carolina.rr.com>
Subject: Re: Rear suspension
From: William T Smith <WmTSmith@landracing.com>
Date: Tue, 23 Oct 2001 17:42:14 -0600 (MDT)
Grib,
I like that plan. wmts



Quoting rgribble <rgribble@carolina.rr.com>:

> Howard, Keith & List,
> Howard I understand your logic and this is not a 
disagreement, just a
> thought to ponder.
> If we set aside for now the reaction time of a sprung 
vs. solid suspension,
> consider perhaps the following;
> If we assume that the function of the suspension (or 
at least part of the
> job) is to keep each wheel in somewhat equal contact 
with the ground. Then
> if forever what reason (aero or whatever), with a 
solid suspension, one or
> two wheels develop lift, it could be safe to assume 
there is less traction
> on that wheel(s) or at least unequal traction. If it 
happens that wheel is
> a
> drive wheel then there is the propensity for wheel 
spin, or at least
> greater
> effort to drive the car?
> .
> I think that because the movement of a spring is 
proportional to the
> pressure exerted upon it, it quite probably would 
move in 1/100th of a
> second. The action of a shock is more derivative and 
integral functions,
> therefore taking longer depending on the purpose it 
was built for. You
> could
> then assume the shock could dampen the reaction time 
of the spring.  The
> people that make spring and shock dyno's could 
certainly tell us the
> answers
> to this proposal and I will attempt to find out their 
input and also post
> it.
> I know that with the DA systems they use in NASCAR, 
there is a lot of
> interest in the relationship of shock movement vs. 
distance from road
> surface for each wheel. Some are sampling 1000 time a 
second. I'm told this
> is to determine the tire contact patch area. I can 
ask some of the team
> engineers just what they are looking for and why. 
When I find out I'll post
> the answers
> Grib
> "Do what others Won't and you'll do what others Can't 
for the rest of your
> life"
> 
> 
> ----- Original Message -----
> From: "Nafzger" <nafzger@vtc.net>
> To: "Keith Turk" <kturk@ala.net>; <land-
speed@autox.team.net>
> Sent: Monday, October 22, 2001 7:01 PM
> Subject: Re: Rear suspension
> 
> 
> > Keith,
> > God knows I'm no expert on this and I have spent a 
lot of time anguishing
> > over this problem on the two liners I have built.
> > I made them both with rigid suspension for three 
basic reasons.
> > 1. Less complex and therefore probably more 
reliable.
> > 2. Lighter and cheaper.
> > 3. I can't figure out how to make a suspension that 
will respond to a 3
> foot
> > wide dip in the salt.
> > Keep me honest on this guys. 60 MPH =88 ft/sec. 
therefore 240MPH =
> > 352ft/sec. Therefore 1/100 of a second = 3.52ft.
> > No suspension I am aware of will even begin to move 
in that time period.
> It
> > will skip right over the depression anyway so I 
just did not mess with
> it.
> > If I'm screwed up in my logic, let me know and I'll 
admit liners may be
> > different in some ways but we have been very 
successful with rigid cars.
> > P.S. The engine builder and I have both agreed to 
not go up there and
> > embarrass ourselves anymore. Way too many engine 
problems.
> > Howard
> >
> >
> > ----- Original Message -----
> > From: "Keith Turk" <kturk@ala.net>
> > To: <land-speed@autox.team.net>
> > Sent: Monday, October 22, 2001 4:28 AM
> > Subject: Rear suspension
> >
> >
> > > Okay along the lines of the Trans mounting 
system....   I wanna do the
> > rear
> > > suspension issues....
> > >
> > > My thoughts are that a fancy rear suspension to 
make the car leave the
> > line
> > > is a Moot point at Bonneville... ( may help you 
at Maxton or El Mirage
> )
> > but
> > > once the car is through the gears it's settled 
down and the only real
> > > advantage of a suspension at all is to maintain 
the contact patch with
> the
> > > ground....over minor bumps...
> > >
> > > Joe Timney and I have beat this up at length and 
I have several idea's
> on
> > > the correct course of action for me....  But I'm 
curious to hear others
> > > thoughts on what they run and WHY?....
> > >
> > > In other words... what are your theory's..
> > >
> > > Keith ( Mayf.... what you doing Hiding out... I 
love your questions...
> > > always pointed .... which may not be pleasing to 
all ... however they
> are
> > > always honest and well thought out )
> 
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