16mm mooring rope

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shaqra

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Would 16mm multiplait rope be good enough to hold a 1250kg displacement boat on a swinging mooring? i.e a etap22. This would be connected to 10mm chain(10mtrs in length). The reason I'm asking, is that is the largest which will go through my bow roller with a sleeving of 3mm rubber hose. Do I up the rope thickness and reduce the sleeving??? Or is this sufficient. A pin over the roller limits
the thickness of rope I can pass over the roller.

Tks for any replies /forums/images/graemlins/confused.gif
 
I use 2X14mm lines for an 18ft (575Kg) boat and it's belt and braces. I used to use the same for a 900KG boat. It's probably more to do with the windage and the underwater shape (as drag against the current) than the boat's displacement.
I would seriously suggest a second strop - slightly longer - to the chain to provide a fall-back situation and not bother with the sleeving as that merely hides the condition of the strop from view. I replace alternate strops every 2 years.
Oh, I reckon you're better with 3 strand nylon.
 
[ QUOTE ]
Would 16mm multiplait rope be good enough to hold a 1250kg displacement boat on a swinging mooring? i.e a etap22. This would be connected to 10mm chain(10mtrs in length). The reason I'm asking, is that is the largest which will go through my bow roller with a sleeving of 3mm rubber hose. Do I up the rope thickness and reduce the sleeving??? Or is this sufficient. A pin over the roller limits
the thickness of rope I can pass over the roller.

Tks for any replies /forums/images/graemlins/confused.gif

[/ QUOTE ]

As a mooring contractor I would have no problem with the 16mm on your boat but I would reject the 10mm chain for being to small, sorry.

With small chains like that you have no reserve for any problems like electrolysis, which may suddenly arrive with the arrival of a leaky boat. Not much to wear there either so it may need replacing often.

You may be in a very low wear spot or something but 10mm is still very small. The loads are fine when new but can disappear very quickly if wear sets in.
 
A lot of people use a single "strop" for moorings ...... but having had a mooring post sheer on a boat - I now advocate multiple strops and mooring points. To give an idea of how strong a rope can be ..... the post gave way and the boat hung on the mooring buoy lanyard that was used to hang the pick-up buoy on the pulpit ..... a bit of light 4mm braid line.

It is fact that 2 small ropes add up to greater total breaking strain than same total mm size single rope. Also you have benefit of making fast to diferent point in case one rope or point gives way.

My last swinging mooring had 3 8 - 10mm strops .... each connected to different point just below mooring buoy ..... cam up to deck via bow roller and mooring fairlead. One strop went to mooring post, one went to anchor windlass, thrid went to mast base. Each carried weight in varying degrees - the mooring post carrying the normal weight, then windlass with a slight touch of slack ..... then mast base.

There was no way I wanted to be a casualty like others onto the concrete wall at end of harbour !!

For your boat 16mm is more than enough .... if you are happy with a single strop.
 
My Leisure 23 (4000lbs) lived on its mooring for 18 months on a 16mm strop (3-strand rather than multiplat). I use a doubled-up 12mm line as backup. I have replaced it with 18mm, but only because I got some from Ebay. I only replaced it because the end became unravelled - there was no wear. I use a piece of tubing as an anti-wear sleeve, because the boat swings around quite a lot, and the rope would chafe on the plates either side of the bow roller.
 
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