If Philco put a 90deg bend on his recovery point so that the shackle pin aligned vertically it would work. Or alternatively put a slot in his point so that a bow shackle could be used and radius the corner of the slot a bit, it also might be ok. But as it stands they are flawed IMHO.
Your recommendations are also flawed...Quote:
Originally Posted by Islandnomad
Add a Radius or slot and the pin will point load, bringing the same issue.
A 90 degree bend will add a stress to the steel and increase torsional loading and would need to be braced.
Then during a recovery above or below the horizontal plane the same issues will occur (loading the pin)
Unless a design incorporates a self aligning recovery point at some stage the recovery will be out of alignment.
A 3.2t shackle is highly unlikely to fail in a vertical recovery point, when used with a bridle on any recovery.. The strap attached is only rated to 8,000kg (pin failure occurs at approximately 22t (22,000kg).
The strength of the chassis is far below this...
Here is a reasonable design that can handle offset.
https://www.aulro.com/afvb/images/im...015/04/521.jpg
https://www.aulro.com/afvb/images/im...015/04/522.jpg
or there is this custom made example (would not be certified rated) and I would question the single point mounting (but a modification could be an option)
https://www.aulro.com/afvb/
Or an adaptation of this
https://www.aulro.com/afvb/images/im...015/04/486.jpg
Tombie I'm no expert and I'm not "recommending" anything, I'm just trying to find a reasonable solution to this recovery point problem. See this ARB Recovery point and its slot for the use of bow shackles (with the bow against the bracket not the pin), I agree point load is an inadequate part of this design as well as the shackle pin alignment. A radius would be better for the bow to bear against, and they are very expensive recovery points so not a lot to recommend (they are flawed):
https://www.aulro.com/afvb/images/im...015/04/528.jpg
I like the hook idea, where do you get those brackets? Wouldn't JATE rings be better?
If the LUKE Straps worked they'd align really well, if they were strong enough????
LRAutomotive does the hook version
I like the look of that stuff.Quote:
Originally Posted by Tombie
However, I have the LandRover "SVX" front ribbed aluminium crash plate, which makes the mounting of such items, including jate rings, difficult.
Any ideas?
Thanks, Pickles.
Hi Tombie,
Just a question about this photo.
It seems to me that the bolts are not long enough to secure the plate shown here safely. They don't even occupy the full length of the nuts on them, and nor do they reach the nyloc ring.
As shown, do you think they are adequate for the stress likely to be involved in a recovery?
Regards,
AndrewMilne
https://www.aulro.com/afvb/images/im...015/04/486.jpg
Possibly just done up finger tight for the photo?
But, yes, not enough thread through.
That pic for one is a rendering of the point over an image. The reflection is completely wrong.Quote:
Originally Posted by Islandnomad
A bow shackle is designed to have up to a three way loading. Imagine the pin end fixed to an eye. You can either pull in a straight line (also use a D shackle) or run two legs off the bow end, which is rated for the offset loading. They are designed as I interpret the ARB information where the bow end is in the loop, loading one side only, and the pin is to the bridle. This creates the exact same problem of offset loading as having the pin bind in any other point.
I use eye bolts, lifting rated so they have an adequate safety factor on top of their rating. Aligned so the shackle pin is vertical, but there is still enough room for some deflection from their vertical alignment WITHOUT pin bind, the pin hole surround hits the bar first so the pin cannot be twisted in the eye. I had them horizontal but that wasn't good enough for some despite the same pin bind negation from the bar.
The eyes were selected in conjunction with the bar maker and after building a replica bar section and destruction testing with a complete setup that I use to see how it all interacted. There was acceptable deformation at up to 32tonnes, which is far beyond anything that I could put through it or the chassis would take.
While I could design something, everyones setup is different. Making it a very challenging proposition to cater to everyone on top of which you can never guarantee the chassis integrity or someones ability to execute the installation. Then there's the legal liability issue, anything suppled fails and you're in a minefield.
I'll stick to making sure my own stuff is adequate and won't affect myself, family or anyone I travel with. Fortunately I've never had to worry about anyone else's stuff (to date) that I've been away with either.
Quote:
Originally Posted by Barefoot Dave
Exactly... A longer bolt (or in this case done up)!
The "best" recovery brackkets are the ones that are positioned to put the pull where its needed most, and thats generally on the axels.
Forgive me for not putting a pic link in but with <2k/sec access fancy stuff isnt easy..
Picture a round bar loop that has 2 flat plates on it that bolt onto the radius arm bush mounts using the same bolts (although slightly longer ones) as the radius arms..
one on each side and a bridle strap that keeps the angle of pull inside of 15 degrees.
If youre worried about angles of pull on pins of shackles on barmount type recovery points you replace the recovery point with a rotating swiveled lifting point. and so long as you've anchored it correctly you're good to apply up to the max load of the swivel.
I'm also a fan of hammer lock joints and a length of chain with an eye on it as an attachement point, they worked great looped through the front spring mounts on fozzy, equal pull on the chassis and then the axle through the spring.