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Old 25 August 2013, 08:17   #1
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What thickness of rope to retrieve a trailer and RIB?

The approach is obscured to the slipway I launch / retrieve from. I plan to use a pulley arrangement and heave out using my car at a right angle. What thickness of rope would you suggest for this?
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Old 25 August 2013, 08:32   #2
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have used 12mm braid on braid, breaking strain 3T.

That could be over kill.

On the other hand if the trailer gets stuck (rock under wheel) would your car have enough pull to break the rope? Flying rope is never good... If trailer was already part way up slip rolling trailer back towards passers by is also not good.
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Old 25 August 2013, 08:33   #3
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10mm multi would work well. or you could try one of those small detachable from tow bar winches.
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Old 25 August 2013, 10:31   #4
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Don't forget to make sure the pulley is up to muster as well!!

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Old 25 August 2013, 11:53   #5
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I like to use 12mm min for anything heavy I might have to use my hands to handle - more to grip and less risk of cutting into my hand. Will ultimately depends on the total weight you're handling.
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Old 25 August 2013, 12:01   #6
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Hi jlang

Sounds like hauling a boat up the slip that way..could be a waiting for an accident to happen.

When I was in the same situation with my heavy harshell boat.. I fixed an electric winch to the trailer drawbar. The winch was on a plate that I just slotted over a couple of pins welded to the trailer. Very easy to attach or remove.

Attach the end of the winch to where you are thinking of attaching the pulley.. winch to there and chock off the trailer wheels so it cant run backwards. Re attach to your car towbar and winch to there..hook up and drive off safely.

Alway keep a chock at hand ..so if you think something is not going right..you can chock of the front jockey wheel ..instantly. I even replaced the wire with a winch tape as I didnt like to think what would happen if the wire broke.

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Old 25 August 2013, 12:32   #7
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Thanks chaps, sounds like 12mm will be easier on the hands and give a bit of margin for error.

Gurnard, neat solution! But what's unsafe about using a pulley, provided it's up to muster as CJL suggested?
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Old 25 August 2013, 12:45   #8
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Perhaps its just me being over cautious Jlanng.

I launch and recover on my own..so would always want to be beside the trailer and not sitting in the car where if something goes wrong..I have no control.

I guess if you are confident the rope wont break..the pulley wont break .. where the pulley is attached wont give way and that nothing else will give.. then its safe to do it your suggested way.

How do the other folks do it at this slipway ?.. they will be in a far better position to advise than people who can only surmise the situation...they will be able to advise on the thickness of rope required too.
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Old 25 August 2013, 12:53   #9
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You need to make sure the pulley or block you are using is at least rated for three times the load you know is going into it as when you deflect a line through 90 degree you are increasing the load by up to 75%.

You also need to consider what you are attaching the block to and what with, this can be the weak link!!

The diameter of the rope you are using depends on what the material of the rope is s all the different materials have different swl.

If to are using a polyester braid on braid then I would use min 12mm this has a rough swl of 2500 kgs, but does have a fair amount of stretch / creep in it so be prepared for the rope to have some give it in.

Also if you tie a knot in the rope this will weaken the rope as knots are not good for rope, in an ideal world all loops should be spliced into the rope...

Hope this is helpful.
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Old 25 August 2013, 13:02   #10
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on trips away we used to get our club fishing boats off remote beaches with a pulley and rope and it worked fine. Pulley attached to ball hitch of one car on grass at top of beach, rope from another car thru pulley at about 90 degrees to boat on beach- From personal experience of seeing one break and do a fair amount of damage make sure the rope or whatever you hang the pulley on is strong enough. The rope on this one that someone had made up snapped and pulley flew thru the air until....well never mind until what Depending on the angle at the pulley there can be a considerable load on it.
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