portable electric winches

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Originally Posted by isuzutoo-eh

Mechanical Advantage is the force applied to the load, divided by the force applied to the apparatus.
In a simple lever, pulley or geared system, it is the inverse of the:
Velocity Ratio (VR) is the distance the load moves divided by the distance the effort moves.

(The majority of pulley diagrams I have found don't show the free end of the rope anchored back to the effort (winch) as in a double line pull, perhaps because it seems counter-intuitive to be pulling a rope back towards itself. Thankfully the rope doesn't care which direction the tension comes from it will still exert equal force upon its ends, ie pulling towards its centre.)

https://www.aulro.com/afvb/images/im...012/06/996.jpg

An easy way to calculate mechanical advantage is to count the number of parallel ropes in tension between the load and the effort. For my diagram above, the ropes to count are red. Count through where the MA and VR are listed.

Weakestlink's figures do account for friction in the system whereas my physics based diagram is a 'perfect' friction free environment.

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Hey Mark, For some reason I can't see your diagram on my computer, Its ALL BLACK with text faintly visible as below, other people can obviously see it as you have been thanked for your post. Below is a screen cap of how I see your diagram.

http://goingbush.com/landy/aulrowinch.jpg

Really Weird, but when I put it thru photoshop I can see it clearly,

Any one else have this issue, or is it just me , or a mac vs windows thing ??

http://goingbush.com/landy/WinchMAdiagram2.jpg

Hi Don, it is probably a legacy of the program I used.
Hopefully the following is better
https://www.aulro.com/afvb/images/im...012/06/995.jpg

Quote:

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Originally Posted by isuzutoo-eh

Hi Don, it is probably a legacy of the program I used.
Hopefully the following is better

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Yes I can see it now, thanks. I wonder if I was the only one that could not see it, :eek: BOTH, the drawing & the way the block worked :D

well, all that convo is enlightening, but the topic was portable winches. I now carry with me a 6 ton come a long with a long chain. It can be carried with one hand , is simple to use, takes up little room, uses no electricity. On a long recovery may have to be reset more than once. I havent had to use it yet but may have to on my next trip. It seems a really easy answer to me as I dont want to have an electric winch hanging off the front of my vehicle.

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Originally Posted by ramblingboy42

well, all that convo is enlightening, but the topic was portable winches. I now carry with me a 6 ton come a long with a long chain. It can be carried with one hand , is simple to use, takes up little room, uses no electricity. On a long recovery may have to be reset more than once. I havent had to use it yet but may have to on my next trip. It seems a really easy answer to me as I dont want to have an electric winch hanging off the front of my vehicle.

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Understood, but I don't think that 6 Ton come along will be any good, I suppose its better than nothing (but not by much) You should go and get stuck within walking distance of home, Then practice getting yourself out with that, you'll either bugger it up or chuck it over the nearest fence. I don't think Electric Winches are much use if you get stuck either, you will usually want to be pulling yourself out backwards, not further into the quagmire. You need to invest in a Tirfor style hand winch especially if you go offloading on your own.

Quote:

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Originally Posted by ramblingboy42

well, all that convo is enlightening, but the topic was portable winches. I now carry with me a 6 ton come a long with a long chain. It can be carried with one hand , is simple to use, takes up little room, uses no electricity. On a long recovery may have to be reset more than once. I havent had to use it yet but may have to on my next trip. It seems a really easy answer to me as I dont want to have an electric winch hanging off the front of my vehicle.

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LOL sorry. Most post get off target as did I.
[ame="http://www.youtube.com/watch?v=zj6N7bgHxJ4"]Lewis Winch snatch block demo, huge log skid. Double the pulling power of a portable winch. - YouTube[/ame] uses a portable winch but it does again claim the MA of 2 which is wrong.

Portable gives you the ablity to winch from front or back which would be great if running solo with out a mate to help pull you back. The 6 tonne would seem a little light if belly deep in muck as I seem to end up rather often:D. A Luff or double block and a single block on your portaable giving MA 3.08 (or 2.3 if reeved to disavantage) would give your 6 tonne more than enough ommps but may mean several pulls given the 2 to 3 times reduction in pull lenght.

This is about portable winch and still on M.A. and advantage. :cool: I will skip the friction resulting by the Luff rig:D.
Found a neat site on the other stuff ( not just about portables again)
http://www.btinternet.com/~fourthgill.seascouts/tackle.htm

In diagram bt3, imagine the 100lb weight is the tree with the snatch block and the pulley at the top of the drawing is the winch. The point at the top left is the recovery point on your car to which the winch cable hook is attached. Half the load is taken by the winch and half by the recovery point.

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Originally Posted by goingbush

Understood, but I don't think that 6 Ton come along will be any good, I suppose its better than nothing (but not by much) You should go and get stuck within walking distance of home, Then practice getting yourself out with that, you'll either bugger it up or chuck it over the nearest fence. I don't think Electric Winches are much use if you get stuck either, you will usually want to be pulling yourself out backwards, not further into the quagmire. You need to invest in a Tirfor style hand winch especially if you go offloading on your own.

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Not sure where you're coming from here. The come along is much easier to use than a tirfor and for the same capacity is about 1/4 of the weight not counting necessary cable, and is also a dam site cheaper. I carried 35m of cable with me for years gave it away just a few months ago to Harry(hope you're getting some good use out of it mate).aluminium bodies are available for come alongs now making them lighter again. They pull as fast as a tirfor and tuck away in a nice small parcel.Why will I bugger it up? I have used them often in my job and find them very user friendly.I certainly wont chuck it away. You must have had some bad issues with them.

I have had a Warn 5000Lb portable winch for almost 25years.

Warn then made them in a steel box with a plastic lid, with provision for a receiver , and two shackles which are stored inside the box along with the power cable.So it can be used on either end of the car, or even off the chassis on a rollover, using the shackles as remote mounts .

I have fitted a towbar under the front bumper to enable front recovery and I have a heavy power cable to the back bumper with an Anderson plug to use the rear towbar.
In all the time I have owned it , I have used it once in anger to recover a car that had two wheels over a precipice on a RRNSW club trip to the Watagans.

I had another opportunity on The OTT but it was faster to use the winch on another car waiting to cross the creek to recover my car and trailer, as I would have had to get it out and rig it before use.

I still think it is a great solution , as it can be stored on the rear seat floor area and is clean and regular in shape so that stuff can be stacked on it and if I am really stuck somewhere it can be utilized.
I have 2 snatch blocks , 30 metre extension strap, tree protector, and spare shackles.
It weighs about 24Kg including box and Dyneema cable.
I also carry a "bullbag" as I have found that if you are really stuck, you need 2 recovery methods eg bull bag to lift out of mud, then winch maybe rolling over the bullbag, which I have actually done, or shovel etc .
Regards Philip A

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Originally Posted by PhilipA

I have had a Warn 5000Lb portable winch for almost 25years.

Warn then made them in a steel box with a plastic lid, with provision for a receiver , and two shackles which are stored inside the box along with the power cable.So it can be used on either end of the car, or even off the chassis on a rollover, using the shackles as remote mounts .

I have fitted a towbar under the front bumper to enable front recovery and I have a heavy power cable to the back bumper with an Anderson plug to use the rear towbar.
In all the time I have owned it , I have used it once in anger to recover a car that had two wheels over a precipice on a RRNSW club trip to the Watagans.

I had another opportunity on The OTT but it was faster to use the winch on another car waiting to cross the creek to recover my car and trailer, as I would have had to get it out and rig it before use.

I still think it is a great solution , as it can be stored on the rear seat floor area and is clean and regular in shape so that stuff can be stacked on it and if I am really stuck somewhere it can be utilized.
I have 2 snatch blocks , 30 metre extension strap, tree protector, and spare shackles.
It weighs about 24Kg including box and Dyneema cable.
I also carry a "bullbag" as I have found that if you are really stuck, you need 2 recovery methods eg bull bag to lift out of mud, then winch maybe rolling over the bullbag, which I have actually done, or shovel etc .
Regards Philip A

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That's pretty much exactly what I envisioned - does anyone still sell anything like that? Wanna sell yours, Phil? Haha :D