chunkielad
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| posted on 4/2/05 at 10:07 AM |
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I also get something that costs me more money than I have
Thanks for those measurement mate - VERY useful. I can make a start on design and jigs from there.
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chunkielad
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| posted on 5/2/05 at 11:20 PM |
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Found these images - anyone tell me if these measurements are similar to ones used on the road at the minute? I don't want to work to settings
that will cause problems.
 
Rescued attachment REAR.jpg
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chunkielad
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| posted on 5/2/05 at 11:21 PM |
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Also chassis layout - I will work out if these are to scale before using them but I think they are....
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chunkielad
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| posted on 5/2/05 at 11:22 PM |
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If the person who owns these files is on here, please U2U me I can't find who they belong to.
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locoboy
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| posted on 6/2/05 at 06:15 PM |
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Picys of IRS on book chassis
with Dimensions on for you.
As accurate as i could be with a tape measure.
Lower bonw
 
bottom bone dims
IRS Rear view
 
irs dims rear view
IRS side view
 
irs dims side view
Top bone
 
top bone dims
upright
 
upright dims 1
Upright
Hope thats of some helf for you.
[Edited on 18/4/05 by locoboy]
ATB
Locoboy
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Bob C
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| posted on 6/2/05 at 08:05 PM |
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Hi Colmacol - please don't take offence, but your bones look like they could use the odd triangle in 'em to prevent
"lozenge"ing when you hit a kerb or pothole.
Likewise the box they're hung off - (though it seems to work OK in tiger avons!) + I'm only too well aware of the difficulties in making
something you can get the diff in and out of!
I'd feel happier making sweeping statements like that if my car had been on the road a few months already - but I'm just venting an
unsubstantiated 1st impression here so feel free to shoot me down in flames!
(hah! as if you wouldn't....)
all the best
Bob
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britishtrident
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| posted on 6/2/05 at 08:29 PM |
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For a proven lower qwishbone here is Spyders version of the original Lotus Elan Plus2 wishbone --- they are just an easier to make skightly beefed
up version of the Lotus original --- both Spyder and the original Lotus wishbones have passed the test of time note the diagonal which as Bob C
very rightly pointed out is there for a very good reason. http://www.spydercars.co.uk/CB-PG3_PLUS2_LR_WISHBONES.jpg
The reason for the dog leg is the Elan had semi-inboard rear discs ie mounted on the inboard of the strut.
The top wishbone only requires to be a simple triangle with a single rose joint or bush at the outer end --- using two bushes or rose joints will
over locate the upright and could cause problems.
[Edited on 6/2/05 by britishtrident]
[Edited on 6/2/05 by britishtrident]
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chunkielad
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| posted on 6/2/05 at 08:44 PM |
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THANK YOU VERY MUCH GUYS!!!!
Wow what a comprehensive set of figures Col. That's got everything I need to have a go and I THINK I will be able to get my engine above all
this too.
It's time to get working and no more talking I think!!!!
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locoboy
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| posted on 7/2/05 at 09:17 AM |
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quote:
--- using two bushes or rose joints will over locate the upright and could cause problems.
Over locate - what does that mean?
ATB
Locoboy
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chunkielad
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| posted on 7/2/05 at 10:57 AM |
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Could you double check your figures for me COl? I started drawing the wishbones based on your figures and using the angle and measurements you gave,
It doesn't fit. Sorry
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locoboy
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| posted on 7/2/05 at 11:02 AM |
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I measured the angles roughly bsing a protractor pmsl.
I will recheck tonight for you.
The angle is not that important its the overall length that is, the angle is only there to allow it to clear the outer most tubes.
ATB
Locoboy
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chunkielad
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| posted on 7/2/05 at 12:29 PM |
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Using the pictures and sizing up I got these.
The don't seem right at the Hub end - any ideas?
 
Rescued attachment IRS Setup.jpg
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Mix
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| posted on 7/2/05 at 12:38 PM |
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Some very amateurish pics of my IRS to date:
 
Rescued attachment IRS-3.jpg
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NS Dev
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| posted on 7/2/05 at 12:42 PM |
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Personal statement here, and it aint the only answer I know, but if I hadn't cheated and bought my chassis from Stuart Taylor, I would have gone
for a De-Dion setup. I just prefer the characteristics of this setup, for a start the chassis will be lighter than with an IRS setup, in fact De-Dion
gives the best weight saving potential of any setup, as well as very good roll control.
I bought my stuff ready made because I have too many other projects to do. If I were to make another chassis in the next few months it would be
another grasser, the sevens are too cheap to just cheat and buy!!!
So I have ended up with the ST chassis and IRS which generally looks ok. The wishbones are pretty "minimal" in terms of build quality, but
look ok and the geometry appears (to me at any rate) to be fine with no glaring errors (like some other manufacturers!)
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Mix
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| posted on 7/2/05 at 12:42 PM |
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Can't seem to get more than one attachment per post
 
Rescued attachment IRS-2.jpg
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Mix
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| posted on 7/2/05 at 12:42 PM |
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Last one
 
Rescued attachment IRS-1.jpg
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locoboy
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| posted on 7/2/05 at 12:49 PM |
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Chunkie,
Try flipping the top bone over. They are handed.
Like i said i will re measure it tonight and *try* to be a bit more accurate!
ATB
Locoboy
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chunkielad
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| posted on 7/2/05 at 12:52 PM |
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Those pis are fantastic mate but I'm looking more for dimensions thanks though. I've looked at Dedion and decided I really want to make
IRS work. There are lots of companies out there with working IRS systems and I can't see why I can't do it too. The car I am building is
designed for the road and track and I think IRS properly set up will give the best ammount of adjustment to setup for either.
I'll let a little secret out in that I am trying to get a custom car built with the option of selling it at a leater date as a turnkey or kit.
My first one will be built by me but I have a few companies lined up ready to make bits as needed after jigging it all up. The chassis is based around
the McSorley but is a middy BEC (will eventually be midddy car engine option too). The body work hasn't quite been finalised just yet so not
going to let too much out of the bag.
If I can offer IRS and maybe a DeDion option, I could give the best option range to customers. I want IRS working on my car before I offer it though.
I have absolutely no knowledge of suspension and hence need a smuch info as possible to ensure I don't sell anything duff or even worse
DANGEROUS!!!
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Mix
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| posted on 7/2/05 at 12:58 PM |
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As I've built it all myself I have all the relevant dimensions. The most important ones I posted earlier in this thread.
Do you intend to design your own IRS or just make a direct copy of another, (perhaps untried) design?
Mick
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britishtrident
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| posted on 7/2/05 at 01:05 PM |
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quote:
Originally posted by colmaccoll
quote:
--- using two bushes or rose joints will over locate the upright and could cause problems.
Over locate - what does that mean?
A linkage should always\use the minimun number links to do the job adding any extra links and the result will be a conflict of arcs -- it may be
very slight but even that will cause additional streses within the system and could cause the linkage to bind up particularly if there is no designed
in compliance such as rubber bushes.
In a double wishbone system if the upper arm is in the shape of a letter "A" then a lower arm in the shape of a letter "N"
will provided restraint in all the required axis of freedom.
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chunkielad
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| posted on 7/2/05 at 01:07 PM |
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I'd prefer a known working set up so I can guarantee it works. This way I will have faith in it.
I don't want to be supplying something that isn't right. What did you do to get your measurements mate? Did you pick them out of the air
or was it a bit scientific?
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britishtrident
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| posted on 7/2/05 at 01:07 PM |
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quote:
Originally posted by Mix
Can't seem to get more than one attachment per post
Nice work Mix
A+ plus
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Mix
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| posted on 7/2/05 at 01:08 PM |
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That's comforting to know as I'm currently favouring an 'A' shaped upper arm
Mick
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Mix
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| posted on 7/2/05 at 01:14 PM |
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What did you do to get your measurements mate? Did you pick them out of the air or was it a bit scientific?
Read books, asked questions on here and taught myself the basics of CAD. Combined the ingredients and that's the result so far.
Mick
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locoboy
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| posted on 7/2/05 at 01:28 PM |
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quote:
Originally posted by Mix
That's comforting to know as I'm currently favouring an 'A' shaped upper arm
Mick
Get yourslef to the docs then quicksmart
ATB
Locoboy
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