You guys are all phunny! Why? Well the front end of the Tiger came from the
Hillman! Does anyone really think any analyses were done on that front end
to make it steer? Especially under the Tiger weight and power? Not to
mention that the frame horns are probably strange to boot!. I would bet that
no one even consodered tire slip angle etc or over steer in building the
first or many tigers. Yikes, this car was thrown together to make sales. The
steering was done to make it work minimally. Using race car dynamics to
build upon a pile of hot rodded invention is folly. As to the correct
ackerman, yeah, you need to do analysis on instant centers and roll centers
and dive during breaking etc. HAs anyone ask Dale A if his kit considered
all those things? How about Duane's analysis? Nah, my bet is that they all
just wanted to improve their steering some.....This is sorta like "polishing
a t**d".
mayf, out in Pahrump
----- Original Message -----
From: "Bob Palmer" <rpalmer@ucsd.edu>
To: "'Stephen Waybright'" <gswaybright@yahoo.com>; <tigers@Autox.Team.Net>
Sent: Wednesday, November 24, 2004 7:38 AM
Subject: RE: A new "angle" on Ackerman
> Steve,
>
> I heartily agree with your comments, and in fact would be even more
> emphatic. Perfect Ackerman or anything close to it is NOT desirable,
except
> maybe for trailers that are only going to be towed at <25 mph. There are
> tire tread slip angles and other factors to be considered. Colin Chapman
has
> also gone on record as advocating parallel or even reverse Ackerman
geometry
> for race cars - although probably not as extreme as a stock Tiger. In my
> experience, using the MGB steering arms and moving the rack back 0.5"
gives
> a substantial improvement in the steering feel. Switching to a Midget rack
> is a separate issue from Ackerman. It's a better design and reduces
steering
> effort over the stock rack, plus has a quicker ratio. Bump steer is a
major
> consideration and it would be best to have it adjusted by a competent
> alignment shop. Even a stock Tiger may not have the bump steer properly
> adjusted and the improvement in steering feel can be enormous.
>
> Bob
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