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Does this look safe?

Posted: Thu Mar 16, 2006 2:06 pm
by 86MUD
What are you thoughts on these radius arms?

http://www.d-90.com/prod/hinge.html

Cheers

Andrew

Posted: Thu Mar 16, 2006 2:12 pm
by HSV Rangie
it works well but you get strange handling. nort recomended.


Michael.

Posted: Thu Mar 16, 2006 2:23 pm
by Philip A
It looks like a great and novel idea for high articulation tracks or rock crawling, . Dunno what all the twisting force going through one set of plates/leading arm will do.
The authorities are unlikely to allow it for registered cars.
Revolver shackles are banned in most states, even though they are like a fixed shackle when pinned.
I think maybe at speed if the pin fell out it could cause interesting steering, as the effective length of the arm would change if it oscillated up and down, causing the axle to move back and forward on one side only.

What is also novel is the great write up the guys did. AFAIK, no one has ever tried this before. Maybe there are some genuine new ideas left.
Regards Philip A

Posted: Thu Mar 16, 2006 2:30 pm
by GRIMACE
in theory its a three link with the third link on the drivers side meeting at the same point on the chassis (IN THEORY).

This givving you rediculously high amount of anti-dive on the driver side.
If you were descending and you pass front tyre went in a hole the braking force (if you were to apply abit) alone would be more than enough to pick up the drivers side rear wheel after it pushes up on the chassis from the front link.

I think these hinged arms are great for level crawling and slow speed 4wding but anything that may involve large decents that need apply little braking (yes sumtimes you have to brake) or hard cornering to the right while braking could be quiet traggic.

If i was to do this i would leave it in all the time and only unpin it if i found i couldnt do a certain section with out it, then id pin it straight back up again.

Cheers
Anthony

Posted: Thu Mar 16, 2006 2:35 pm
by GRIMACE
Philip A wrote:AFAIK, no one has ever tried this before. Maybe there are some genuine new ideas left.
Regards Philip A
Sam (aka Strange Rover) setup a hinged radius arm on his rover for abit.

Posted: Thu Mar 16, 2006 2:40 pm
by GRIMACE
Philip A wrote: Dunno what all the twisting force going through one set of plates/leading arm will do.
yeah id reccomend reinforcing the plates.

Philip A wrote:
I think maybe at speed if the pin fell out it could cause interesting steering, as the effective length of the arm would change if it oscillated up and down, causing the axle to move back and forward on one side only.
this would be very bad :shock:
I posted on 4wd monthly sum time ago that another conern with the one side of the diff wanting to move back or forth abit more would be bad in a situation where your at full droop on the pass side and it come into contact with a large rock step, the forces would be rather large and id be very worried about the diff bein pushed back and maybe bending....
Also as the wheel tries to climg the step it twist the links or the diff as more and more force would be apllied againts the front and twisting.... All this concentrated at on point one the diff and one point on the chassis could become a problem....
It may never bee a drama and i might be thinking too much into it but its sumething to ponder.


edit: :oops: i just read that though myself, and fark i need to learn proper engrish :roll:

Posted: Thu Mar 16, 2006 3:53 pm
by Loanrangie
Wouldnt the panhard rod and prop shaft prevent or limit the movement of the diff ? it would only allow it tilt forward and back ,i cant see any advantages ?

Posted: Thu Mar 16, 2006 4:11 pm
by GRIMACE
Loanrangie wrote:Wouldnt the panhard rod and prop shaft prevent or limit the movement of the diff ? it would only allow it tilt forward and back ,i cant see any advantages ?
panhard rod wont really limit shit and yes the prop shaft might help but its on the drivers side and the amount of slip in it will not help hold the diff in place much if at all.

Posted: Fri Mar 17, 2006 5:27 am
by james feeney
These turned up in the UK about two years ago but never took off at all. Not even sure if they are still available over here.

JF

Posted: Fri Mar 17, 2006 9:04 am
by disco200tdi
A friend of mine has run one of these for at least the last five years. you can just see it on the front left.

Had some problems with bushes and bearing flogging out but got it sorted and it is very reliable. You do need to reconnect the pin for any high speed driving.

Posted: Fri Mar 17, 2006 9:32 pm
by Michele