Mooring Strops

Mooring Strops

Mooring Strops are ideal for permanent mooring configurations

The Jimmy Green Rigging Team are very experienced in splicing up Strops and Bridles for permanent mooring applications.

Anchorplait is the optimum...


Mooring Strops are ideal for permanent mooring configurations

The Jimmy Green Rigging Team are very experienced in splicing up Strops and Bridles for permanent mooring applications.

Anchorplait is the optimum solution for single swinging moorings:

  • The rope construction precludes the possibility of cockling (unravelling)
  • The splice design is very secure and will not unravel

3 Strand Nylon will suffice if the mooring set up will not allow the boat to swing through 360 degrees in the tide.

Selection process for a mooring strop on a swinging mooring:

  1. Find the column in the table below that best represents your Boat Length Overall.
  2. Compare your displacement with the tonnage listed.
  3. If the displacement is greater than displayed in your column in the table, or your yacht is a multihull, consider moving across to the next column to increase the diameter.
  4. Take advice on local conditions and check the benchmark size from the table below against other similar sized boats moored in your area.
  5. Have a good look at the mooring configurations on neighbouring yachts with a critical eye and judge whether your set up should be the same.
  6. Consider whether you can make any improvements in terms of mooring convenience and anti chafe measures.

Permanent Mooring Warps, Strops and Bridles:

  • Single Point generally means a Swinging Mooring
  • Double Point could be e.g. Fore and Aft between piles
Benchmark Guide for Single (or Doube) Point Mooring Strops
Yacht Length Overall< 5 metres5 - 6 metres6 - 8 metres8 -10 metres10 - 12 metres12- 14 metres14 - 16 metres
Approximate length in feet< 16 feet16 - 20 feet20 - 26 feet26 - 33 feet33 - 40 feet40 - 46 feet46 - 53 feet
Displacement in tonnes0.6 tonnes1 tonne2.5 tonnes5 tonnes9 tonnes13 tonnes16tonnes
Strop Diameter14mm16mm18mm20mm24mm28mm32mm

N.B. Use only Anchorplait for swinging moorings - 3 strand lines may 'cockle' when the 'swing' turns against the lay of the rope.

Cockling (unravelling against the lay of the rope)

Cockling occurs when a fixed 3 strand construction warp is forced to rotate against the direction of the twisted lay, opening up the strands until they distort into 'ears'
This will eventually be the case if a yacht continually swings around it's mooring 'the wrong way'.

You can sample this with a soft piece of small diameter 3 strand rope - Twist it tighter and and the rope construction tightens - Twist it the other way and the strands will soon deform and the rope will go completely out of shape, compromising the performance of the warp, with the distinct possibility of failure through rupture.

Video Demonstration of Rope Cockling

This may not look like it can happen in a large diameter strop.
When a large diameter nylon warp is first introduced into contact with seawater and used in anger the fibres shrink, the lay of the rope tightens and the end result is a stiff rope akin to an iron bar that doesn't look like it could possibly unravel but it certainly can in conditions where the force of the rotational twist in the unlaying direction is both strenuous and persistent.

Cockling cannot happen with Anchorplait - It doesn't matter which way the rope is twisted, it only tightens the lay.

Look after our splicing as well as your rope:
The 3 strand splice itself is also prone to eventually unravel if the set up issues are not addressed - once the rope has distorted as far as physically possible without rupture the rotational force may be transferred to the splice with disastrous consequences.

When you have chosen the rope construction and the diameter, you can get an instant quote online, including all the splicing and finishing, anti chafe and compensator options.

If you have any difficulty withn;your Custom Build Mooring Strop, try reading our step by step instructions.

Custom Build Instructions

Jimmy Green Advisory on Twin Strops for Multihulls:

For wide span catamarans and trimarans, it will be prudent to use two separate strops shackled together to make a V shape
A further short strop could also be deployed at the apex of the V to make a Y shape