Outer Limits 4x4 Board

SuperiorEngineering wrote:I would love to see a finite element analysis to show us how these arms are stronger than a "properly" manufactured radius arm ?

The quick FEA run I did on a rangerover radius arm (for the deflections mentioned above) showed the highest stress to be in the upper flange between the two bushing eyes.
In that area, these arms have no flange, the 10mm plate web finishes unsupported.

Fathillbilly wrote:Thanks for the input, as always Outerlimits provides an endless supply of wisdom and knowledge.

GUJohnno wrote:

Fathillbilly wrote:Thanks for the input, as always Outerlimits provides an endless supply of wisdom and knowledge.

As always, competitors are quick to bag out other competitors similar products

SuperiorEngineering wrote:I would love to see a finite element analysis to show us how these arms are stronger than a "properly" manufactured radius arm ?

What is a properly manufactured arm?

How i see it, the arm will only flex as far as the bushes will allow, which has been used as an example for a super flex arm.

Above pic shows by relocating the bushes closer together (also using a smaller diameter one as well) greatly improves arc you can make before "bushes" max out.
This is the main claim for the super flex arm.

Note: I am only going off what info i could find on how the super flex arm works. If i am wrong by all means correct me. This is just how i see what info i have read. Just interested and tryng to understand.

So mostly, movement of arm comes back to bush size, how much they compress and where they are positioned.
If your bump stops, stop the diff at the bushes limit of up travell, and the shock length is right for bushes limit of down travell, the arm is not really doing much flexing at all.

The FAT ams aren't fabricated for flexing as really every pivot point is the same old nissan position.

I fabricate track frames to carry 60 to 70 ton, majority of its mild steel.
My point, engineered right, cant see a problem with fabricated arms.

The main problem i see with these arms is the extended section to reach arond to front bush of the diff, its weak point.

Not putting down suprerior here at all, imo they have the best arm available.

But its only one arm, on one side that dose all the work.
Not really even distribution, balance.

Nothing is perfect when i comes to road and off road i guess.
Super flex arms aren't perfect either, it cant be when flex is dedicated to one arm?
They are not a complete billet arm, it still has welded sections.

Firstly -
I am not stating this design is not manufactured properly just saying i believe a radius arm would be stronger providing it was made properly.


A "properly" manufactured radius arm as i stated earlier is exactly that, a product/design that is tested prior to being used by a FEA test, proper procedures done as far as designing, cutting, welding , finishing and documenting.

Some of the 4wd parts manufactured buy some guys in the industry should never be allowed to be sold or even fit on their own trucks as the quality is absolute rubbish ( NO SPECIFIC PERSON I AM POINTING OUT, JUST A GENERALIZATION FOR SOME )



Hope that makes it easier to understand what i was trying to explain.

Any way that started going off topic so back to the original topic.

SuperiorEngineering wrote:Some of the 4wd parts manufactured buy some guys in the industry should never be allowed to be sold or even fit on their own trucks as the quality is absolute rubbish ( NO SPECIFIC PERSON I AM POINTING OUT, JUST A GENERALIZATION FOR SOME )

Oh ain’t that the truth, and I love to see some people coming up with their own idea as well, now that would be something.

btw i would love to see the FEA on these http://www.superiorengineering.com.au/p ... ts_id=3681

Not really, not interested

But a FEA on the axle housing, now that would be interesting, plus an analysis on the increase load on the bush v's the bush life. I would also like to see how these arms would perform in the OBC or Cliffhanger.

OK enough fun

Just some interesting little bits of info, the section of the arm that broke was 36mmCDS x 6mm wt, a std arm is 42mmx 27mm, so 6mm less in the vertically, and 9mm in horizontal, since the end of July 09 the arms are have been 56mm x 36 in that same section, so an increase of 14mm vertically and 9mm horizontally.

The whole drop Box these bolt up to are made out of 8mm plate same as our standard ones, the whole box, not a bit of 4mm here and a bit of 3mm here and a bit of 6mm there, like some.

I don't give a rat's about the Engineering side, i just ned to get off my arse and put the F.A.T arms on. and get them out of the Shed

They were in cliffhanger 08 without any failures from what i remember the fastest deisel time on record.
i think to date we would have sold in excess of 4000 of these arms without a single failure ! within australia and overseas.

We do FEA tests on all our suspension products, i am sure anyone who is serious about putting a truly safe product on the market does it.

I was not trying to take the piss out of your design just stating in my opinion against a radius arm i believe the radius arm is a stronger design.

You interpret my posts how you like.

Why don't you guys just shit into your hand and throw it at each other.

Hopefully thats our little disgruntle over and the post goes back to what it was about , his arms