Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: suspenders
theconrodkid

posted on 29/8/02 at 07:59 PM Reply With Quote
suspenders

Anyone know why wishbones are suposed to be different lengths?ive tried it on with kiddies geometry set and can see no difference between equal and not,answers on a £5 note please
View User's Profile E-Mail User View All Posts By User U2U Member
interestedparty

posted on 29/8/02 at 08:04 PM Reply With Quote
The reason for unequal length wb's is if they were the same length the track (in this case the distance between the tyres where they touch the road) would change as the wheels go up and down. Also with the top 'bone shorter than the bottom as the wheel moves up (outside wheel on hard cornering) so the negative camber increases and improves grip.

John





As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!

View User's Profile E-Mail User View All Posts By User U2U Member
theconrodkid

posted on 29/8/02 at 09:15 PM Reply With Quote
thanks for that,i used to have a book explaining all that but its gone now,is there a formula for working out difference in lengths and top bone angle etc?
View User's Profile E-Mail User View All Posts By User U2U Member
interestedparty

posted on 29/8/02 at 09:28 PM Reply With Quote
quote:
thanks for that,i used to have a book explaining all that but its gone now,is there a formula for working out difference in lengths and top bone angle etc?


I expect there is but I don't know of one, and it would probably be to complex anyway. My inclination would be use the 'book' lengths proprtionately if you see what I mean.

John





As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!

View User's Profile E-Mail User View All Posts By User U2U Member
stevedenbigh

posted on 30/8/02 at 11:00 AM Reply With Quote
Allan Staniforths books, Competition Car Suspension and Race and Rally Car Source Book deal with the complexities of suspension design in an easy to understand way. Use the books link on this page to get hold of these if you want to have a go at designing your own suspensuion, or are just interested in what suspesnion design is all about.The books also show how you can model the suspension using an easy to construct model.

In short, the lengths and angles of the wishbones control the manner in which a number of things behave, these being the camber angle of the wheels in cornering as body roll occurs, the camber angle of the wheels in acclerating and braking (due to the chassis pitching) and the camber angle of a whel when it goes over a bump or dip in the road, plus the previously stated change in track width, and also very importantly the roll centre of the suspension. The roll centre is the point about which the vehicle rolls, and you need to get the height of this right if you dont want your vehicle to jack up like the chevy corvair did, and you need to stop it moving about if you want the vehicle to settle into a corner quickly and behave in a predictale manner

That wasn't really very short was it?

View User's Profile E-Mail User View All Posts By User U2U Member
Alan B

posted on 30/8/02 at 01:13 PM Reply With Quote
There's a good photo on page 124 of the new Tiger book.

It shows a Tiger cornering with some visible (though small) body roll, yet the outside front wheel (the one that matters ) is nice and square to the track.

Good front suspension in action.

View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
theconrodkid

posted on 30/8/02 at 03:12 PM Reply With Quote
Thanks for the input peeps,i did have the book and very good it was too,but it went walkies and i cant get a new one,so there you go.
View User's Profile E-Mail User View All Posts By User U2U Member
fastenuff

posted on 30/8/02 at 06:06 PM Reply With Quote
Also with equal length wishbones the trackwidth changes more. This causes the car to slow down due to higher rolling resistance, but i reckon with most unequal set-ups there is some of this present.





Ingmar

View User's Profile E-Mail User View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.