Hand winches?? which one

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Originally Posted by scrambler

The snatch block does NOT have to be attached to the vehicle - but if you don't you'll need to attach the winch AND the other end of the robe/extension strap to the vehicle and walk along with it. Sometimes it might be a better option.

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If the snatch block is anchored and Not moving there is no mechanical Advantage, e.g. if the Tirfor was attached to the load (vehicle) and the wire rope was fed thru a snatch block anchored (not moving) to a tree and back to the load (vehicle) then there is no mechanical advantage (other than that supplied by the Tirfor), i.e. winch 1 metre of cable thru Tirfor, load (vehicle) moves 1 metre, Mechanical advantage is determined (pulleys and ropes) by the number of parts of rope Supporting the MOVING block, Regards Frank.

sorry tank not quite....

2:1 can be achieved as previously stated by running from the rig, to the tree and back to the rig.....

theres a few other ways of doing it but they all involve extra funky setups that youd only contemplate doing if you had the entire block and tackle setup of a tall ship at your disposal. Even I dont carry that much gear.

MA is essentially gonked out by counting the number of ropes coming from the object being moved and then dividing by the number of ropes with winches (that are pulling)on them

Rigged to advantage or rigged to disadvantage, Im guessing, where you might have your wires crossed...

if your pulling on a rope that comes from the object that you want to move through a pully system your rigged to advantage and if your pulling from the stationary block its to disadvantage.

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Originally Posted by Blknight.aus

sorry tank not quite....

2:1 can be achieved as previously stated by running from the rig, to the tree and back to the rig.....

theres a few other ways of doing it but they all involve extra funky setups that youd only contemplate doing if you had the entire block and tackle setup of a tall ship at your disposal. Even I dont carry that much gear.

MA is essentially gonked out by counting the number of ropes coming from the object being moved and then dividing by the number of ropes with winches (that are pulling)on them

Rigged to advantage or rigged to disadvantage, Im guessing, where you might have your wires crossed...

if your pulling on a rope that comes from the object that you want to move through a pully system your rigged to advantage and if your pulling from the stationary block its to disadvantage.

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Dave, if you are pulling on a rope thru an anchored pulley and back to the load, you are pulling say South and the load is moving North, then you are pulling to Disadvantage and you have no Mechanical Advantage (MA), and the load moves exactly the same distance forward as the amount of rope you pull backwards which is 1:1, if you attach the pulley to the load, run the rope back to you and anchor it and pull on the unanchored end of the rope the pulley and the load will move in the same direction as you are pulling, i.e. you are pulling to Advantage and if you pull 1 metre of rope in the load and pulley will move 1/2 a metre, giving you a MA of 2 or 2:1, Regards Frank.

These might help:

and these:

bigger the better, but heavier.

If you get one, use it before you leave home. try getting bogged and getting yourself out with just the hand winch. After 2 hours of compaining and cursing, you will relise that its a EMERGENCY tool. What i mean is you wont go places that you might get stuck as the recovery is so damn tiring........

I dont carry my Tirfor anymore, i used to when i never had a elec winch, but a hand winch will get you out of places the elec cant, sideways, backwards and back on its wheels after you roll it..........

Get a good quality one, about $500 is the going price i think.....

Mine only has a 8m cable as that is all i think i need to get that problem solved....... ive only used mine once and i winched sideways out of a ditch..... Simex could not get me out of the rut i was in......

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Originally Posted by AndyRevill

These might help:

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Andy, that's correct, you'll notice in the 1st, 3rd and 5th example the pull is to disadvantage and there are more parts of ropes, e.g. in the 3rd example there are 3 parts of rope to halve the load and in the 2nd there are only 2, so if you attach your Tirfor to a tree and the snatch block to the vehicle, run your cable from the Tirfor thru the snatch block and back to the anchor point you will halve the load (less the friction thru the block) and make life a bit easier, Regards Frank.

I think Dave and Frank are describing two slightly different setups. Both are right if you allow for one small difference.

If the rope goes from the front of the bogged vehicle (presumably a Cruiser or Patrol) through a pully attached to a tree and back to the winch which is anchored to another tree, each metre of cable through the winch moves the vehicle one metre. So no mechanical advantage and Frank is right.

If the rope goes from the front of the bogged vehicle (presumably a Cruiser or Patrol) through a pully attached to a tree and back to the winch which is attached to the front of the bogged vehicle, each metre of cable through the winch moves the vehicle half a metre. So 2 to 1 mechanical advantage and Dave is right.

I think that's right.

Just resurectingthis thread as I read about the weight issues...
Can some of those new polyester (or whatever they are made of!) winch ropes be used with a tirfor? Or does it rely on clamping onto the hard wire rope?
Cheers,
Dave

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Originally Posted by davros

Just resurectingthis thread as I read about the weight issues...
Can some of those new polyester (or whatever they are made of!) winch ropes be used with a tirfor? Or does it rely on clamping onto the hard wire rope?
Cheers,
Dave

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Clamps on the wire rope.

Cheers
Simon