Snatch recovery

Submitted: Monday, May 09, 2005 at 14:54
ThreadID: 22808 Views:1994 Replies:5 FollowUps:7
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I have a 9m snatch strap and 20m winch extension. Can I connect these together to use in a snatch recovery situation?
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Reply By: MrBitchi - Monday, May 09, 2005 at 15:27

Monday, May 09, 2005 at 15:27
You probably shouldn't, but in a pinch I'd do it. Sooner join 2 snatch straps.
Not many situations where a 9m strap is not long enough.

Cheers, John.
AnswerID: 110461

Reply By: signman - Monday, May 09, 2005 at 16:11

Monday, May 09, 2005 at 16:11
no no no no no
Your winch strap is made for a static pull load NOT the built in elasticity of the snatch strap. The same scenario- a snatch strap should not be used for a tow/ extension strap.
AnswerID: 110468

Reply By: Wayne (NSW) - Monday, May 09, 2005 at 16:32

Monday, May 09, 2005 at 16:32
robdavo,

You can join the two straps together and make a 29mt strap. The snatch strap will stretch and the winch strap will not. Not the best way to go.

You can get 30mt snatch straps which would be better if a long strep is required.

A word of warning, don't join any straps with a bow shackle.

Wayne
AnswerID: 110474

Follow Up By: Member - Roachie (SA) - Monday, May 09, 2005 at 22:17

Monday, May 09, 2005 at 22:17
I agree with Wayne (G'day mate), but would add another word of caution about joining straps.

If you do not want to end up with one long strap ( the 2 straps permanently joined) , do not loop the 2 straps through each other without something in between. Best thing is 2 or 3 bits of wood (say tree branches about a foot long x about 20mm thick....3 bits of broom handle would do nicely). You need to put thend of one strap through the loop of the other and do the same at the opposing ends; kinda hard to explain, but you end up with the straps' loops together. If you don't stick something in the gap between the 2 they will bind under load and be impossible to separate, rendering both pretty much useless.
Cheers,
Roachie
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FollowupID: 367043

Follow Up By: Nick R - Tuesday, May 10, 2005 at 08:53

Tuesday, May 10, 2005 at 08:53
Good point but a safer thing to use would be tv week, women's weekly, new idea, etc, etc which the missus inevitably brings, reason being they are less likely to become a projectile if "something happens" can't remember where I saw this but it made sense to me.
NickR
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FollowupID: 367054

Follow Up By: Truckster (Vic) - Sunday, May 15, 2005 at 21:30

Sunday, May 15, 2005 at 21:30
Check the bottom of this page

Also some great specs too

EG:
Determine Speed of Shackle if Snatch Strap Breaks.

If all the Elastic Energy of the Snatch Strap is transferred to Kinetic Energy in the Shackle then the peak Speed of the Shackle as the Snatch Strap returns to it's 9.0m length can be determined. (Assuming no losses due to friction)

From Energy Conservation,
Elastic Energy in Snatch Strap = Kinetic Energy of Shackle
PEStrap = KEShackle
1/2 k x2 = 1/2 m v2
where k = spring constant
x = distance stretched (meters)
m = mass of shackle (kg)
v = velocity of shackle (m/s)
1/2 (20750N/m) (0.579m)2 = 1/2 (0.68kg) v2
v = 101m/s

or Peak Speed of Shackle v = 364 km/h
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FollowupID: 367720

Reply By: Member - Phil G (SA) - Monday, May 09, 2005 at 18:15

Monday, May 09, 2005 at 18:15
The main problem with your suggestion is that your winch strap will only be rated at 4000kg, while your snatch strap is most likely rated at 8000kgs. 4000kgs is not enough for snatching a heavy 4wd.

Your suggested combo would be a good combo for a towing situation.

I don't have a problem with the overall elasticity as the combo has the same elasticity as just the snatch strap.

Cheers
Phil
AnswerID: 110493

Follow Up By: Gajm (VIC) - Monday, May 09, 2005 at 19:30

Monday, May 09, 2005 at 19:30
Great pic Phil, unfortunately it really makes me desperate to get away again. I had a look at the others too...glad I am not the only one who takes pics of lizard/insect tracks in the sand.
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FollowupID: 367002

Follow Up By: Member - Phil G (SA) - Monday, May 09, 2005 at 20:40

Monday, May 09, 2005 at 20:40
Just realised, I named the first one wrong - Its Madigan's oval, not claypan - long way from anything anyway.

Yep, I've got itchy feet too - 6 weeks before the next desert trip :-)) Doing the Hay River.

And I have to admit to borrowing the insect track photo from a mate with a nice camera.

I was sick of vehicle photos, so thought I'd put up some far away trip photos.

Cheers
Phil
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FollowupID: 367019

Follow Up By: robdavo - Sunday, May 15, 2005 at 19:29

Sunday, May 15, 2005 at 19:29
Thanks to all who replied - sorry about the late ack from me.
It's pretty much as I expected; most, as I, would do it in an emergency(capital E) but nobody seems to have actually tried it.
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FollowupID: 367709

Reply By: Wayne (NSW) - Sunday, May 15, 2005 at 19:40

Sunday, May 15, 2005 at 19:40
robdavo,

I have used the joining of many straps. Once we had 120mt of straps joined together. It was the only way we could get enough traction to snatch the convey up a greasy hill. We had every type of strap from tree trunk protectors, winch straps and snatch straps all joined together.

Wayne
AnswerID: 111366

Follow Up By: Member - Phil G (SA) - Monday, May 16, 2005 at 19:09

Monday, May 16, 2005 at 19:09
Hi Wayne,

I've done likewise, but to tow not to snatch.

Cheers
Phil
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FollowupID: 367845

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