Author Topic: Recovery Bridle - how long should they be? (Read 11409 times)

BigJules · « **on:** May 02, 2012, 09:37:23 PM »

I know some of you use tree trunk protectors for this purpose. Generally they're about 3m long. Is this too long?

If you were going to buy one, how long would you want it?

D4D · « **Reply #1 on:** May 02, 2012, 09:40:21 PM »

I'll measure mine tomorrow but I'd guesstimate it is around 1.8m

BigJules · « **Reply #2 on:** May 02, 2012, 09:43:36 PM »

I was thinking around 1.5m, appreciate you measuring it up for me.

Jason B · « **Reply #3 on:** May 02, 2012, 09:45:24 PM »

I dont have one, so this is only a thought, wouldn't you want it at least 2.5 to 3m so that the pulling force is directed forward rather than having a short one that would put more side load on the recovery points (try to pull them together more).

Not sure if I have explained what I mean well enough. I am keen to get one also.

Regards

Jas

GGV8Cruza · « **Reply #4 on:** May 02, 2012, 09:47:13 PM »

There was a lot of talk about these ones when I did my advanced course last weekend, I will be geting one of these I think. 3m long

http://www.4x4equip.com.au/showProduct/4x4+Accessories/Recovery+Gear/IDH-23-6/Recovery+Bridle

GG

BigJules · « **Reply #5 on:** May 02, 2012, 09:50:50 PM »

Don't rush out and buy one just yet.

Crockett · « **Reply #6 on:** May 02, 2012, 09:53:50 PM »

Quote from: BigJules on May 02, 2012, 09:50:50 PM

Don't rush out and buy one just yet.

dejavu

Maîneÿ . . . · « **Reply #7 on:** May 02, 2012, 10:00:40 PM »

Quote from: BigJules on May 02, 2012, 09:50:50 PM

Don't rush out and buy one just yet.

are you starting up a supply chain for some (quality) 4X4 equipment

I also would think you would want it at least 3 mt long, so the pulling force is directed forward, not sideways towards the other recovery point, rather than having a short one where you would be putting more load sideways on each recovery point forcing them together.

GGV8Cruza · « **Reply #8 on:** May 02, 2012, 10:04:25 PM »

Quote from: BigJules on May 02, 2012, 09:50:50 PM

Don't rush out and buy one just yet.

Do tell more

GG

db · « **Reply #9 on:** May 02, 2012, 10:42:18 PM »

Just straps equaliser strap is 2.5 mtr long (https://www.juststraps.com.au/store/cart_detail.asp?group1=Specialty_4x4)

SteveandViv · « **Reply #10 on:** May 03, 2012, 04:51:30 AM »

Quote from: Jason B on May 02, 2012, 09:45:24 PM

I dont have one, so this is only a thought, wouldn't you want it at least 2.5 to 3m so that the pulling force is directed forward rather than having a short one that would put more side load on the recovery points (try to pull them together more).

Not sure if I have explained what I mean well enough. I am keen to get one also.

Regards

Jas

I'm with you. I would want the force to be further out the front than side to side. Anyway, I got what you meant

baldheadedgit · « **Reply #11 on:** May 03, 2012, 04:59:07 AM »

Quote from: Jason B on May 02, 2012, 09:45:24 PM

I dont have one, so this is only a thought, wouldn't you want it at least 2.5 to 3m so that the pulling force is directed forward rather than having a short one that would put more side load on the recovery points (try to pull them together more).

Not sure if I have explained what I mean well enough. I am keen to get one also.

Regards

Jas

Yep, Agree with Jason on the length point. But i think i will wait and see what a certain Big fella comes up with..

BHG

McGirr · « **Reply #12 on:** May 03, 2012, 06:17:49 AM »

Jules , What did they do to you in china !!!

Water torcher , drugs !!!

Your talking all funny ... Do you have a catalogue yet I can browse through !!

Mark

disco1 · « **Reply #13 on:** May 03, 2012, 10:38:20 AM »

Interesting topic I have a three metre sling rated at three ton that i use, my front recovery points are bolted to my
bullbar.

Mauri

Big Nath · « **Reply #14 on:** May 03, 2012, 10:43:19 AM »

Quote from: McGirr on May 03, 2012, 06:17:49 AM

Jules , What did they do to you in china !!!

Do you have a catalogue yet I can browse through !!

Mark

X2

Cheers!

jk · « **Reply #15 on:** May 03, 2012, 11:32:29 AM »

Just went up the shed and measured our straps,.........1 x 2.4m
1 x 3.0m

Crisp Image · « **Reply #16 on:** May 03, 2012, 12:52:54 PM »

Ok so here goes. I will try and explain something and I hope you all get it.
Rigging rules.
If you have a straight pull the 100% of the load goes to the single point. eg 100kg=100kg
If you have 2 point that are seperated and the angle is 90degrees where the attachment point is then the load back to each point is 71% of the load. So 100kg load means 71kg to each point of attachment at the vehicle.
If the angle is 120deg then there will be 100% at each point and at 150deg there is 200% load at each point.
So, If you keep the angle to 90deg or less then the load sharing capability is better over 2 points.
Therefore you need to make sure that the sling length is long enough to achieve these angles.

I hope that makes sense.

Regards
Crisp Image

D4D · « **Reply #17 on:** May 03, 2012, 01:14:47 PM »

Good info here http://www.nobles.com.au/products.aspx?doc_id=3681

BigJules · « **Reply #18 on:** May 03, 2012, 01:32:01 PM »

Thanks CI. Good info.

Crisp Image · « **Reply #19 on:** May 03, 2012, 01:47:54 PM »

Quote from: D4D on May 03, 2012, 01:14:47 PM

Good info here http://www.nobles.com.au/products.aspx?doc_id=3681

Yes this is good info. Lets compare apples with apples.
Our winch extension straps and snatch straps are rated at braking strain (as far as I am aware). Each of the slings in the above table have safety factors built in and are rated at working load limit.
If you took breaking strain into account then a 1t sling had a breaking load of about 7t.

Items rated for towing are not rated the same for lifting. Take the turfor it had a 2.5t pull but a 1.5t lift.
Oh and to achieve a 60 degree angle all sides of the triangle are the same length for those who had forgotten or destroyed the brain cells that info was stored in.
Regards
Crisp Image

Daawl · « **Reply #20 on:** May 03, 2012, 03:27:17 PM »

Quote from: Crisp Image on May 03, 2012, 12:52:54 PM

Ok so here goes. I will try and explain something and I hope you all get it.
Rigging rules.
If you have a straight pull the 100% of the load goes to the single point. eg 100kg=100kg
If you have 2 point that are seperated and the angle is 90degrees where the attachment point is then the load back to each point is 71% of the load. So 100kg load means 71kg to each point of attachment at the vehicle.
If the angle is 120deg then there will be 100% at each point and at 150deg there is 200% load at each point.
So, If you keep the angle to 90deg or less then the load sharing capability is better over 2 points.
Therefore you need to make sure that the sling length is long enough to achieve these angles.

I hope that makes sense.

Regards
Crisp Image

In regards to your strait pull CI

If you use a sling around an anchor and you have strait pull ie almost 0deg angle at attachement point, each leg of the sling actually takes close to 50% of the load. So 100kg load would put 50kg on each leg of the sling. Then as you stated the % of load increases on each leg as the angle increases at attachment point.

a very simplistic tip for people to remember when it comes to sling angles (at attachment point) is the "I,Y,T" principal.

I = Ideal (less than 90deg)
Y = Yes, it is acceptable (between 90-120deg)
T = Terrible, dont go there (any angle over 120deg)

Crisp Image · « **Reply #21 on:** May 03, 2012, 05:39:25 PM »

Quote from: Daawl on May 03, 2012, 03:27:17 PM

In regards to your strait pull CI

If you use a sling around an anchor and you have strait pull ie almost 0deg angle at attachement point, each leg of the sling actually takes close to 50% of the load. So 100kg load would put 50kg on each leg of the sling. Then as you stated the % of load increases on each leg as the angle increases at attachment point.

a very simplistic tip for people to remember when it comes to sling angles (at attachment point) is the "I,Y,T" principal.

I = Ideal (less than 90deg)
Y = Yes, it is acceptable (between 90-120deg)
T = Terrible, dont go there (any angle over 120deg)

I did say that to a single attachment point gives 100% as it is impossible to have straight pull from 2 points (unl;ess using a spreader bar)

Another way of of looking at IYT is I is the straight line pull y is the less than 90deg angle and T look like a T and therefore not suitable.
A good way of demonstrating this is to get 3 people and a sling.
Get 2 people to hold the sling standing together and then the third try to pull the others over.
This is the I
Then get the 2 people to separate and make a 90deg angle at the 3rd person. The third person is more able to move the others. Then if the sling is straightened and the 3rd person pulls the middle of the sling they will move the others easily.

Try it and see.
Hope that makes sense
Regards
Crisp Iamge

LC · « **Reply #22 on:** May 03, 2012, 05:44:25 PM »

My ARB supplied equalizer is made out dynamica rope and is 2.1m in length. It has some of that protective sheathing over each eye and in the middle.

just startin · « **Reply #23 on:** May 03, 2012, 07:11:03 PM »

Hi guy's I use a 3T 4mtr soft sling and I am sure that it is good for 5T straight pull as the angle is less than 60deg and it can also be used as an extension winch strap. I hope that helps

alnjan · « **Reply #24 on:** May 03, 2012, 07:24:15 PM »

Have mentioned this before in another thread about bridles, equalising straps, call them what you like.

If the recovery is a snatch strap recovery, we just use a snatch strap. The more straps or bits you attach you are only increasing the chance of something going wrong.

The only time we have used a bridle as such was for recoveries that needed to be done under control and they were winch recoveries.

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Author Topic: Recovery Bridle - how long should they be? (Read 11409 times)