MikeR
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| posted on 18/2/05 at 12:39 PM |
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monoshock - why, whats the advantage?
Guys,
Just seen some pics of a mono shock from the GTS challenger....
I'm curious, why use a mono shock? Whats the advantage? whats the effects with regard to handling? How does it affect the shock? Why has no one
else done it on a IRS seven? Why not use it in the front instead of twin shocks?
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chrisf
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| posted on 18/2/05 at 01:35 PM |
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It seems to me that the mono shock has built in anti roll. Another advantage is that it can easily be designed as rising rate. It also has weight
advantages.
I too am interested in how it drives--specifically how it behaves in roll and extreme bumps.
--Chris
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JonBowden
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| posted on 18/2/05 at 03:05 PM |
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Can anyone give a more detailed explanation. I just don't get this monoshock idea.
If my (poor) diagram is about right, then the spring / damper unit should resist bump that affects both wheels at the same time (eg speed bump or
squat due to acceleration).
It should provide absolutely no roll resistance at all.
I think that this should give good grip at the rear and possible understeer as the front is providing all the roll resistance.
[Edited on 18/2/05 by JonBowden]
 
Rescued attachment Monoshock.gif
Jon
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Alan B
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| posted on 18/2/05 at 03:17 PM |
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Jon, I asked this question myself on another thread.
Where does the roll resistance come from as none is apparent from pictures?
Edit:
This thread....
http://www.locostbuilders.co.uk/viewthread.php?tid=19793
[Edited on 18/2/05 by Alan B]
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NS Dev
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| posted on 18/2/05 at 03:35 PM |
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there are a large number of ways of doing a monoshock, some useful and have point, others less so with little point other than the "because I
could" value!
A Trishock arrangement with two normal pushrod operated shocks plus a third for antiroll is a more interesting arrangement, as it gives very tuneable
roll characteristics, but adds weight.
The system that I can not fathom out is the Dax antiroll system, which seems to be completely solid in roll but also when 1 wheel moves separate to
the other (over a bump and not in roll!)
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JonBowden
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| posted on 18/2/05 at 03:36 PM |
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Alan,
I read your previous post. Even without an anti-roll bar, normal suspension resists roll. This design does not do that. As far as I can see, if this
setup was used at both ends, the car could be pushed over with one finger. Or am I missing something - some F1 cars use a single spring / damper
Jon
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Alan B
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| posted on 18/2/05 at 03:43 PM |
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Jon, exactly my point....this set-up with the single spring not anchored to the chassis anywhere can move freely in a roll situation....it needs an
anti roll bar or some means of resisting roll.....
I understand the dual roles of bump and roll resistance in a conventional set-up and that an anti-roll bar is not always required.
NS Dev...
Yep, I've seen the arrangements you describe....all provide some roll resistance.
The question here is what provides roll resistance in THIS set-up rather than how it is usually done.
[Edited on 18/2/05 by Alan B]
[Edited on 18/2/05 by Alan B]
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Piledhigher
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| posted on 18/2/05 at 05:06 PM |
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Based on the diagram above, it looks like the shock is tied to the frame through the pivots. When there is body roll would not the shock/spring combo
resist roll based on the spring characteristics?
Cory
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NS Dev
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| posted on 18/2/05 at 05:39 PM |
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quote:
Originally posted by Alan B
Jon, exactly my point....this set-up with the single spring not anchored to the chassis anywhere can move freely in a roll situation....it needs an
anti roll bar or some means of resisting roll.....
I understand the dual roles of bump and roll resistance in a conventional set-up and that an anti-roll bar is not always required.
NS Dev...
Yep, I've seen the arrangements you describe....all provide some roll resistance.
The question here is what provides roll resistance in THIS set-up rather than how it is usually done.
[Edited on 18/2/05 by Alan B]
[Edited on 18/2/05 by Alan B]
yes, see what you mean...........nothing as far as I can see!
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chunkielad
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| posted on 18/2/05 at 05:40 PM |
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Alternative setup used in Formula Renault
[Edited on 18/2/05 by chunkielad]
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JonBowden
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| posted on 18/2/05 at 05:46 PM |
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found this diagram and description for a swing-axle suspension with a similar transverse mono-shock in formula Vee
http://www.fvee.org.au/handbook/rearsusp.html
They say there is no roll resistance
Jon
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NS Dev
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| posted on 18/2/05 at 05:47 PM |
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....................and best left on a formula renault I think!
not much use if it goes over a bump!
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MikeR
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| posted on 18/2/05 at 05:59 PM |
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damn, i was looking for a more positive view as it would fit nicely over my brand new (well new to me) audi transaxle....
looks like two shocks next to each other pivoting against the chassis would be better.
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gazza285
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| posted on 18/2/05 at 06:03 PM |
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Works on a single seater as the roll resistance comes from the rear and race tracks are generally smooth.
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chrisf
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| posted on 18/2/05 at 06:12 PM |
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Gents:
Understand that I offered my understanding of the system. By no means was I trying to proclaim and absolute truth. As it turns out, I am wrong.
I'm still interested in how it drives.
--Many apologies for the propaganda, Chris 
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MikeR
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| posted on 18/2/05 at 06:15 PM |
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Chris all propaganda is welcome, as long as the truth is found in the end!  )
(disclaimer - I am not responsible for any blood letting in the finding of the truth!)
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CD-5
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| posted on 18/2/05 at 06:35 PM |
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This look more logical for a mono shock setup. taken from the drysdale motorcycle site.
[img]http://home.mira.net/~iwd/openwheeler/dh-7.htm[/img]
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NS Dev
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| posted on 18/2/05 at 08:04 PM |
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quote:
Originally posted by MikeR
damn, i was looking for a more positive view as it would fit nicely over my brand new (well new to me) audi transaxle....
looks like two shocks next to each other pivoting against the chassis would be better.
oh dear Mike!! Hadn't you better finish this one first!!!???
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MikeR
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| posted on 18/2/05 at 08:29 PM |
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 off this week to push that along!
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NS Dev
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| posted on 18/2/05 at 08:55 PM |
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you don't want to push it, you need an engine!!!
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niceperson709
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| posted on 18/2/05 at 09:42 PM |
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I saw a set up like this on a 2F 1R trike he claimed it does work .
photo below , a wild machine by the way
best wishes
Iain
 
Rescued attachment rides03081804.jpg
Best wishes IAIN
life is not the rehearsal , it's the show so don't sit there thinking about it DO IT NOW
http://iainseven.wordpress.com/
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niceperson709
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| posted on 18/2/05 at 09:44 PM |
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and here is a discription of how it works from "Motorcycle sport" magazine
best wishes
Iain
Best wishes IAIN
life is not the rehearsal , it's the show so don't sit there thinking about it DO IT NOW
http://iainseven.wordpress.com/
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niceperson709
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| posted on 18/2/05 at 09:47 PM |
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help if I include the pic
 
Rescued attachment Radial susp003.jpg
Best wishes IAIN
life is not the rehearsal , it's the show so don't sit there thinking about it DO IT NOW
http://iainseven.wordpress.com/
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niceperson709
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| posted on 18/2/05 at 09:49 PM |
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help if I include the pic
 
Rescued attachment Radial susp003.jpg
Best wishes IAIN
life is not the rehearsal , it's the show so don't sit there thinking about it DO IT NOW
http://iainseven.wordpress.com/
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clbarclay
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| posted on 18/2/05 at 10:43 PM |
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Going back to the qestion of what the advantage is, its obvious you half the cost of coil overs which start at aroud £300 for a set of 4
A set of 2 would only be £150
That Formula Renault, the suspension looks rock solid in effect it would be like using a solid (not spring steel) roll bar. precisly the oposite of
what we are all worried about.
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