Go Back   Cruiser Log World Cruising & Sailing Forums > Cruising Forums > General Cruising Forum
Cruiser Wiki

Join Cruiser Log Today

Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-09-2005, 06:29 PM   #1
Lieutenant
 
Join Date: Apr 2005
Posts: 69
Send a message via MSN to Chetan
Default ROPE

can anyone help me with the difference between S lay and Z laid rope? is it really important to notice this difference?

What is the definition of creep? why are some cores (spectra / vectra / dyneema) plaited and others not?

Should you always check core diameter separately from sheath thickness or can you assume that core is always a particular percentage of the rope thickness?

we always use halyards as a primary and safety line while going up the mast. in such a case would you say that the lack of stretch in a halyard is a bad thing since in the event of a fall, there is less shock absorption?

waiting to hear from you folks

chetan
__________________

__________________
Chetan is offline   Reply With Quote
Old 11-09-2005, 08:09 PM   #2
Admiral
 
Auzzee's Avatar
 
Join Date: Jan 2005
Home Port: Darwin
Vessel Name: Sandettie
Posts: 1,726
Default

Hi Chetan. When going aloft you will either be climbing mast steps or be hauled up under a halyard. Either way the dedicated safety line should be tailed by crew on the deck so that there is very little slack. Consequently I suggest the less 'give' in the halyard, the better. As for the physical aspects of cordage, most manufacturers list specifications on their websites.....the West Marine catalogue (available free from westmarine.com) has a wealth of information on all categories of cordage.

best wishes. David.
__________________

__________________
"if at first you don't succeed....Redefine success"!


Auzzee is offline   Reply With Quote
Old 11-10-2005, 07:54 PM   #3
Gord May
Guest
 
Posts: n/a
Default

Three strand twisted line can be "laid" right or left, and should always be coiled with the lay of the line. This rope is described as S-laid (left-laid) or Z-laid (right-laid) according to whether the twist follows the line of the center part of the letter S or Z. Most three strand rope is Z-laid (right-laid) If you hold a length of 3 strand right-hand laid twisted line at arm's length and eyeball it, you will see the wrap of the line twisting to the right.

8-strand Multiplaited (“Brait”, “Octoplait”, etc) is braided with 2 pairs of Z-laid and two pairs of S-laid strands – it is flexible and does not kink.

Proper “Fall Arrest” safety lines must be elastic (stretchy) to prevent severe injury. This is not practicable on sailboats where we use relatively inelastic halyards for the purpose. As Auzzee (David) notes, this is why it is imperative that the deck crew maintain the tag line tight, so that there is little/no slack (hence no appreciable fall).

HTH,

Gord May
__________________
  Reply With Quote
Old 11-11-2005, 12:57 PM   #4
Lieutenant
 
Join Date: Apr 2005
Posts: 69
Send a message via MSN to Chetan
Default

thanks very much for your replies

is there any intrinsic difference in the behaviour and uses of S / Z laid rope?

when you say coil rope along the lay, do you mean that S rope would be coiled anti clockwise and Z rope would be coiled clock wise?

is this relevant in the case of line which has an outer sheath as well? and if so how can you discern the lay of the the core?
__________________
Chetan is offline   Reply With Quote
Old 11-11-2005, 06:12 PM   #5
Gord May
Guest
 
Posts: n/a
Default

From: “Animated Knots by Grog”: http://www.animatedknots.com/index.php

Many techniques are described for coiling ropes. The underlying expectation is the same: when the rope is needed, it should pull smoothly from the coil without forming knots or twists - far easier said than done. Opinions vary as to: whether the coil should consist of stacked figure 8 turns or should consists of alternate loops twisted in opposite directions; whether the coil should be folded in half before completion; and how the coil should be secured. In general the worst way to store a rope is flat on the ground as a Flemish Flake (spiral coil). Not only will it get dirty, it is too likely to have multiple twists and kinks if pulled out in a hurry.

Coiling The Unattached Rope:

http://www.animatedknots.com/coiling/index...ge=LogoGrog.jpg

Coiling The Attached Rope:

http://www.animatedknots.com/coilattached/...ge=LogoGrog.jpg

The Figure 8 Flake:

http://www.animatedknots.com/fig8flake/ind...ge=LogoGrog.jpg

This also describes the basic method of “stuffing” a storage bag or bucket.

HTH,

Gord
__________________
  Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rope Round The Prop? MMNETSEA Repairs & Maintenance 25 08-08-2016 08:54 PM
Wire Rope In Anchor Rode Between Anchor And Chain Seafarer General Cruising Forum 2 12-17-2010 03:39 PM
Rope To Use When Replacing Wire-rope Halyards chopwood Rigging & Sails 5 11-13-2008 11:21 PM
Which Rope For Dock Lines? Velella General Cruising Forum 9 05-08-2007 07:58 AM

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

RV & Travel Trailer Communities

Our RV & Travel Trailer sites encompasses virtually all types of Recreational Vehicles, from brand-specific to general RV communities.

» More about our RV Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


All times are GMT. The time now is 01:48 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.0