|
|
Post by thumper on Mar 20, 2015 11:19:33 GMT -4
Update.. This winch pulled a 3/4 ton truck with a v plow on front through a 7' drift. I am still very impressed with it. On the back country run I pulled some jeeps and trucks on 35s with no issue. On the club run it pulled myself with no issues. No regreats on this purchase. Da Dogg Yeah it pulled really good on the pipeline even when you were buried deep and didn't have much line out. |
|
pyth
Jeeper
Posts: 503
|
Post by pyth on Mar 20, 2015 16:04:15 GMT -4
Pulled a 1 ton up an ice covered hill through a snow drift yesterday with it. Had to anchor my Jeep to a tree. Didn't know if it was going to do it at first, I'll be honest it was my first time ever winching something. Just when I thought nope, not gonna move it the winch almost seemed to bear down harder and dragged it up the hill! I had maybe 20 feet of line out at the time.
|
|
eastcoastcam
Jeeper
Is it time to go wheeling yet??
Posts: 1,690
|
Post by eastcoastcam on Mar 20, 2015 16:51:51 GMT -4
Pulled a 1 ton up an ice covered hill through a snow drift yesterday with it. Had to anchor my Jeep to a tree. Didn't know if it was going to do it at first, I'll be honest it was my first time ever winching something. Just when I thought nope, not gonna move it the winch almost seemed to bear down harder and dragged it up the hill! I had maybe 20 feet of line out at the time. Remember... The more line you have out, the stronger the pull you have. It drops with each layer of cable on the drum. |
|
ronin
Jeeper
Out on the Mira
Posts: 661
|
Post by ronin on Mar 21, 2015 0:19:04 GMT -4
Think of it this way. If you attach a single pully on a ceiling. Now you put a rope threw that pulley. Put a loop on one end of the pulley rope and put 200lbs on it. Now if you pull the other end of the rope you will be lifting 200lbs. The pully itself and rope will experience 200lbs of force. Now think of the 200lbs of weight is your jeep, the other end of the rope you are pulling is the winch. There is no mech. advantage. The full 8,000lbs pull will only decrease after the first row on the winch barral and will slowly decrease as you get more wraps on that barrel. :-) Nope. Your simple example is wrong. the hook into the ceiling will see 400lbs. Yes, the rope will see 200lbs per side. The pully is lifting the 200lb weight, and also seeing the 200lb force you are exerting to lift. add them together to see force acting on ceiling hook, or tree strap as it were. (There is also a 10% frictional loss for the wire going thru the snatch block, not shown in calcs) Here, look: I drew a picture   The amount of line on the drum is accounting for 20% capacity loss per layer. Derek's link is stating 10% per layer. 8000K winch on bottom layer = 8000K capacity 8000K winch on 2nd layer = 8000 X .20 (20% reduced capacity) = 1600. Winch will pull 8000 - 1600 = 6400. 8000K winch on 3rd layer = 8000 X .40 = 3200. Winch will pull 8000 - 3200 = 4800. (Getting close to half capacity.) 8000K winch on 4th layer = 8000 X .60 = 4800. Winch will pull 8000 - 4800 = 3200lbs. (less than half capacity by only spooling out a few feet.) Everyone got it?  Jan , wouldn't the man pulling the rope only be pulling 100 LBs . I thought the whole idea off a pully is to lower the weight of the load cutting his job in half . |
|
coolwind1
Moderator 
President - Halifax Chapter
Posts: 1,318
|
Post by coolwind1 on Mar 21, 2015 11:58:30 GMT -4
Nope. Your simple example is wrong. the hook into the ceiling will see 400lbs. Yes, the rope will see 200lbs per side. The pully is lifting the 200lb weight, and also seeing the 200lb force you are exerting to lift. add them together to see force acting on ceiling hook, or tree strap as it were. (There is also a 10% frictional loss for the wire going thru the snatch block, not shown in calcs) Here, look: I drew a picture The amount of line on the drum is accounting for 20% capacity loss per layer. Derek's link is stating 10% per layer. 8000K winch on bottom layer = 8000K capacity 8000K winch on 2nd layer = 8000 X .20 (20% reduced capacity) = 1600. Winch will pull 8000 - 1600 = 6400. 8000K winch on 3rd layer = 8000 X .40 = 3200. Winch will pull 8000 - 3200 = 4800. (Getting close to half capacity.) 8000K winch on 4th layer = 8000 X .60 = 4800. Winch will pull 8000 - 4800 = 3200lbs. (less than half capacity by only spooling out a few feet.) Everyone got it? Jan , wouldn't the man pulling the rope only be pulling 100 LBs . I thought the whole idea off a pully is to lower the weight of the load cutting his job in half . Because the man is 200lbs and the weight is 200lbs the pulley will experience 400lbs of force. Now if the rope had a loop in it, and the guy put his foot in that loop and then pulled down on the rope the pulley will only have 200lbs of force. |
|
Creepy
Administrator 
Dartmouth
Posts: 18,718
|
Post by Creepy on Mar 21, 2015 15:42:02 GMT -4
Jan , wouldn't the man pulling the rope only be pulling 100 LBs . I thought the whole idea off a pully is to lower the weight of the load cutting his job in half . In this example, all the pulley is doing is changing direction of force, it isn't multiplying it. (no 'snatching' taking place) The intent was to show the 400lbs load in the hook holding the pulley. A lot of people are having problems visualizing the mechanical advantage to snatching, and 'don't believe it'. To answer a question with a question - if snatching back to your rig DOESN'T double the force acting on your tree strap.....how in the hell does the winch that failed to get you out in a single line pull, get you out when snatched? 8000# from single line pull, vs 8000# on the tree strap when snatched back? You are still stuck. Fails basic logic test. Its because the tree strap sees 16000# (bearing in mind drum layers and line length out is also giving you an advantage, I recognize this, but some people must think thats all the advantage you get, it isn't. I'm talking max capacity of winch, fully spooled out.) Anyone - Feel free to google 'block and tackle'...humanity has only been using this mechanical advantage for thousands of years.....it can't be too hard to grasp!  www.google.ca/search?q=block+and+tackle&rlz=1C1AVNG_enCA613CA613&espv=2&biw=1600&bih=775&tbm=isch&tbo=u&source=univ&sa=X&ei=hMwNVbO2OdKXyASkxILIDw&ved=0CCgQsAQ#tbm=isch&q=block+and+tackle+mechanical+advantage&revid=1621115286&imgdii=_en.wikipedia.org/wiki/Block_and_tacklegood diagram proving the 'tree strap load' is an addition of the two downwards force vectors. en.wikipedia.org/wiki/Block_and_tackle#/media/File:Polispasto2B.jpgUS ARMY recovery manual. fig 22-6 shows single snatch producing 2:1 mechanical advantage. www.billavista.com/tech/Articles/Recovery_Bible/files/US%20Army%20driving%20manual%20vehicle%20recovery%20ch22.pdf |
|
|
|
Post by T-Dogg on Apr 4, 2015 9:48:10 GMT -4
Up date; winch is working excelent.
Tried mira rd didnt get far but the winch worked great.
Many stucks in deep snow and it pulled me without issue.
Like this winch.
Da
Dogg
|
|
pyth
Jeeper
Posts: 503
|
Post by pyth on May 3, 2015 22:57:03 GMT -4
Pulled a 2dr JK with a busted front axel out of a peat bog up to his rockers. Extremely difficult pull. But she did it. This winch is the friging truth!
|
|
|
|
Post by T-Dogg on May 13, 2015 21:14:07 GMT -4
Many pulls on the winch now.
tonight a 4 door jk buried in mud, myself up a slick muddy hill then the other jk.
a yj burried in ice And water.
seems to be working fine.
da
Dogg
|
|
|
|
Post by donsjeep on May 13, 2015 22:12:16 GMT -4
Many pulls on the winch now. tonight a 4 door jk buried in mud, myself up a slick muddy hill then the other jk. a yj burried in ice And water. seems to be working fine. da Dogg Ya need to stop getting stuck lol Sent from my SGH-I747M using proboards |
|
The Garagemahal
Moderator
Build Thread King
Resident Army Ranger , Navy Seal , Super-Warrior , Ninja !!
Posts: 11,518
|
Post by The Garagemahal on May 13, 2015 23:58:28 GMT -4
Many pulls on the winch now. tonight a 4 door jk buried in mud, myself up a slick muddy hill then the other jk. a yj burried in ice And water. seems to be working fine. da Dogg Its still new , it WILL fail ! |
|
|
|
Post by TomWood on May 14, 2015 9:35:18 GMT -4
All winches will fail, from what I have seen of these they are a great winch. Especially when I saw a superwinch fail on its first pull out of the box that was barely needed.
|
|
