snatch straps
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From: Fulton IL
Fleet Mechanic
Joined: Mar 2007
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From: Simi Valley, CA
its actually nothing like a bungee jump, if using a ****** strap were like a bungee jump, the truck that was pulling would get jerked back towards the stuck truck, and im pretty sure thats not what you want, it actually works the opposite of a bungee jump, like you jump, and hit the excursion limit of the bungee, then the bridge comes down after you (or the truck comes out of the mud), thats what using a ****** strap is like, so i guess its like abungee jump in that the rope stretches, but thats all
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From: Lower Mainland, BC
Originally Posted by bla1879
it actually works the opposite of a bungee jump, like you jump, and hit the excursion limit of the bungee, then the bridge comes down after you
Fleet Mechanic
Joined: Mar 2007
Posts: 1,398
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From: Simi Valley, CA
what are multi part lines, you use those for like hookin your truck up to trees or other vehicles or something?
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Post Fiend
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From: Atlanta GA
Actually, it is like bungee jumping...
The bridge only wins because of higher mass. If you hook a ****** strap to a F-350 and attempt to pull a tractor trailer the F-350 will snap back. The reason it works with small trucks pulling bigger trucks is the little truck, say 4,000 pounds is going 5 mph, so that is 4000x5=20,000 foot pounds of force. The strap follows in the direction of greater force applied or it breaks.
This is why when moving tractors around you never "bump" anything. You are actually hitting with (14,000 pounds x 5 mph) 70,000 pounds of force. You can easily destroy a 1/4" thick aluminum bumper with a "bump" into a cement pole.
I have pulled (or tried to) stuck tractors with a F-350, mass many times will win over force applied. Then it was time for getting a heavy tractor with locking diffs for the pull
You never want to get in a pulling match with a septic tank truck.
The bridge only wins because of higher mass. If you hook a ****** strap to a F-350 and attempt to pull a tractor trailer the F-350 will snap back. The reason it works with small trucks pulling bigger trucks is the little truck, say 4,000 pounds is going 5 mph, so that is 4000x5=20,000 foot pounds of force. The strap follows in the direction of greater force applied or it breaks.
This is why when moving tractors around you never "bump" anything. You are actually hitting with (14,000 pounds x 5 mph) 70,000 pounds of force. You can easily destroy a 1/4" thick aluminum bumper with a "bump" into a cement pole.
I have pulled (or tried to) stuck tractors with a F-350, mass many times will win over force applied. Then it was time for getting a heavy tractor with locking diffs for the pull
You never want to get in a pulling match with a septic tank truck.
Senior User
Joined: May 2007
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From: Dinwiddie, Virginia
Rebocardo is right with the math and yes the recovery truck can rebound backwards if it has grapped hold of more weight than it can handle. I always wear me seat belt if I am the recovery truck because it is one hell of a ride! That is way this only works good off road where a loss of traction for the recovery truck can prevent damage to gears and shafts. I have seen someone use a ****** strap on pavement and it wasn't cheap!
A chain is the safest to use because it will not snap back in any direction. A chain will just drop to the ground when it breaks. But it cannot be jerked in any way are stuff is going to break.
Straps, ropes and cables will snap back, but like someone said above, I place a wet blanket over the cable to hold it down if it breaks.
A chain is the safest to use because it will not snap back in any direction. A chain will just drop to the ground when it breaks. But it cannot be jerked in any way are stuff is going to break.
Straps, ropes and cables will snap back, but like someone said above, I place a wet blanket over the cable to hold it down if it breaks.
Lead Driver
Joined: May 2000
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From: Senoia, GA
Originally Posted by bla1879
can you winch out a larger vehicle than yourself? or will that just pull your own truck towards the stuck truck, i have no experience at all with winches...
EASY man EASY!
-cutts-
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Originally Posted by bla1879
what are multi part lines, you use those for like hookin your truck up to trees or other vehicles or something?
If you ran your vehicle's winch cable to a snatchblock/pulley that's attached to the stuck vehicle, then back to terminate on your vehicle, that would be a 2-part line. If you ran it through a second snatchblock/pulley on your vehicle and terminated it on the stuck vehicle, that would be a 3-part line.
Ideally, with a 2-part line, you can apply twice the force as if you hooked straight from winch to stuck vehicle. With a 3-part, triple. The trade-off, and it's not a big deal, is that you'll pull in 2 (or 3) feet of line to move the stuck vehicle 1 foot.
With a 3 part line, I winched a truck weighing ~14 tons up a 45 degree slope with a wrecker weighing only 5 tons. The smaller truck still needs to be anchored in some fashion, but not as firmly as a single-line pull would require -- I used 4"x4" blocks behind the tires and a stick holding the brake-pedal (not recommended because of the power-steering pump powered hydro-boost brakes, but it worked). I don't fully understand the math, but a 2-part line also helped recover a stuck plow-truck (a Chebby) when a single line was just pulling my 6-ton wrecker across the ice.
Securing to a tree or other fixed object -- also not recommended. S'a good way to bend your frame.
Fleet Mechanic
Joined: Mar 2007
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From: Simi Valley, CA
ah gees wow thats crazy, i never heard of that kind of stuff before, but i dont usually do the type of offroading, i usually go fast in the desert, not fast in the mud/snow/whatever else you will get stuck in! but sounds to me like the best way out of ****** straps, tow strap/chain, or a winch, is the winch, but its prolly the most expensive option too...and the reason that its NOT like a bungee jump is that the person jumping is not trying to pull the bridge down, the person is expecting the bridge, and truely hoping, will stay in place, the extcracting truck IS excepting the stuck truck behind it to move and become unstuck, so again, lol its actually not like bungee jumping this is prolly 
Last edited by bla1879; Jun 1, 2007 at 11:08 PM.
Lead Driver
Joined: May 2000
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From: Senoia, GA
Originally Posted by IowaTower
Securing to a tree or other fixed object -- also not recommended. S'a good way to bend your frame.
never bent a frame *knock on wood* after pulling some heavy/stuck trucks out.
and you dont think yanking on a truck wont bend a frame? lol
what are you smoking?
EDIT... if any of you have never gone through this guide it will answer any and all of your questions!
pira te4x4.com/tech/billavista/Recovery/ (remove the space)
-cutts-
Last edited by fishmanndotcom; Jun 2, 2007 at 12:18 AM.
Senior User
Joined: Jan 2004
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From: Michigan
a strap needs to be sized for the load, not just because of breaking point but you do not want it like a wet noodle, you can buy 2 straps, have two of the loops cut off and have them sewed (sp) together.