Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 24-05-2013, 08:50   #16
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon
Boat: Seafarer36c
Posts: 3,659
Re: dyneema/specta lifelines

I would like to clear up something, I did not say that the lifeline streched, I said the lashing at the ends did. I try and use at least 3 or 4 turns on each lashing. The life line itself does stop streching.
__________________

__________________
Guy is offline   Reply With Quote
Old 24-05-2013, 08:57   #17
Registered User

Join Date: May 2012
Location: Baltimore, MD
Boat: Cal 2-27
Posts: 839
Re: dyneema/specta lifelines

Hey there Guy,

My apologies, I was not trying to insinuate you were saying it stretched. Might have come across wrong. I just often hear people say it stretches and I always try and give more detail on it so that people truly understand how it works.
__________________

__________________
76% of statistics are made up.
boatsail is offline   Reply With Quote
Old 24-05-2013, 09:01   #18
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 9,866
Re: dyneema/specta lifelines

Quote:
Originally Posted by boatsail View Post
Your point cannot be argued.

The only questions I pose is what object on your body would go between you and a lifeline that would cut through the lifeline while you were being hurled against it?
I don't know. It just doesn't seem like a good idea to be able cut so easily through a lifeline. Call me traditional.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 24-05-2013, 09:34   #19
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon
Boat: Seafarer36c
Posts: 3,659
Re: dyneema/specta lifelines

I kind of like the idea of being able to cut the lifelines. Getting a MOB back on board comes to mind.
__________________
Guy is offline   Reply With Quote
Old 24-05-2013, 09:45   #20
Registered User

Join Date: Jun 2010
Location: Sailing the Caribbean
Boat: Switch 51
Posts: 1,457
Re: dyneema/specta lifelines

Quote:
Originally Posted by Guy View Post
I kind of like the idea of being able to cut the lifelines. Getting a MOB back on board comes to mind.
+1 AND this stuff does not cut so easily.
__________________
SVNeko is offline   Reply With Quote
Old 24-05-2013, 10:18   #21
Registered User

Join Date: Jan 2012
Posts: 1,172
Images: 15
Re: dyneema/specta lifelines

Quote:
Originally Posted by boatsail View Post
they call it creep to kind of differentiate it from stretch.

Sorry, but creep is a different animal.

As I said above, what y'all are referring to is known as "constructional stretch" which refers to the fibre braid nesting as you load it. This is temporary, and will stop.

"creep" is elastic elongation under constant load, and is a deformation of the fibre itself. This is longer term and would become an issue when loading is higher, more like if you use it as standing rigging.

Huge difference ;-)
__________________
tamicatana is offline   Reply With Quote
Old 24-05-2013, 10:19   #22
Registered User
 
SVTatia's Avatar

Join Date: Jul 2007
Location: Toronto, Canada
Boat: Luders 33 - hull 23
Posts: 772
Re: dyneema/specta lifelines

Hitching a ride here...

How about chafe?
Wouldn't the line chafe around the stanchions? Does it need protection as it enters and exits the stanchion holes?
__________________
SVTatia is offline   Reply With Quote
Old 24-05-2013, 10:21   #23
Registered User

Join Date: Jan 2012
Posts: 1,172
Images: 15
Re: dyneema/specta lifelines

The article referenced above is pretty comprehensive, covering most of the concerns, including chafe
__________________
tamicatana is offline   Reply With Quote
Old 24-05-2013, 10:39   #24
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,150
Re: dyneema/specta lifelines

Yes, Spectra of-course!

We are in year 10 that we have it and I am thinking of replacing it next year because I like something new.

Here is my tip: check what the biggest diameter line is that fits through the stanchions. My stanchions take two different sizes: the top takes 10mm (3/8") and the lower line can be 8mm (5/16"). I would go for that maximum size because it handles so much better.

The problem with this is that it can get silly strong and expensive. There are two ways to handle that:

1. Let's say the lower can be 3/16" and the upper 5/16". You decide 3/16" is strong enough; then you can add a polyester cover to it for the upper which will make it the bigger diameter. You can buy separate cover about anywhere nowadays.

2. Let's say you can have 5/16" and 3/8" like me. You can then buy a line that has a core which is part dyneema and part polyester. This brings strength down to normal levels for that diameter and also the price so that it makes sense again.

For a bare single braid, I would choose Samsom Amsteel Blue over any other hi-tech line I've had in my hands. The reason is that it handles very good, doesn't feel sticky or waxy or hard etc. When you add a cover this doesn't matter of-course.
__________________
s/v Jedi is offline   Reply With Quote
Old 24-05-2013, 10:53   #25
Registered User
 
funjohnson's Avatar

Join Date: Mar 2010
Location: Currently Indiantown FL
Boat: 37' aluminum pilothouse "Elements"
Posts: 1,580
Quote:
Originally Posted by estarzinger View Post
You go and post an excellent article like that and not mention if Hawk uses stainless of Spectra!


We switched to Amsteel last year and so far like it. The only issue is where the genoa sheets brush against the lifelines on some points of sail. I'm getting a bit of fuzz there, but not too much to worry about it in the 5,000 miles we have travelled this year.
__________________
MJSailing.com - Written Blog
Youtube MJ sailing - Vlog
funjohnson is online now   Reply With Quote
Old 24-05-2013, 11:30   #26
cruiser

Join Date: Aug 2011
Location: Tampa Bay area
Boat: Hunter 31'
Posts: 5,731
Re: dyneema/specta lifelines

Quote:
Originally Posted by boatsail View Post
What people call stretch is not stretch, but the lime pulling tight. You'll notice the difference in line hardness and diameter after it is used. Plan for that in advance and you'll be fine.

I still use steel cable for the top, but spectra/dyneema for the middle one.
__________________
Rakuflames is offline   Reply With Quote
Old 24-05-2013, 11:44   #27
Senior Cruiser
 
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
The pardey's rock three strand. I'm replacing from metal and might try that. Ours are really loose right now, tight half inch three strand seems okay?

When it's done with that job I can use it for mooring lines.
__________________
rebel heart is offline   Reply With Quote
Old 24-05-2013, 12:07   #28
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 16,564
Re: dyneema/specta lifelines

I do not like dyneema spectra lifelines. I find dyneema spectra too likely to be cut by a sharp object. But then again, every boat is different, and I would probably go dyneema spectra way in a racing boat.

b.
__________________
barnakiel is offline   Reply With Quote
Old 24-05-2013, 12:58   #29
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,150
Okay, here it is: I invite Barnie to come along Jedi and find the sharpest thing on deck apart from the emergency knife and then try to cut my lifelines with it. I'll be nice and give him three slashes instead of just one. If he manages to cut it, I buy drinks and new lifelines; if he doesn't manage to cut it, he will buy everone in this thread a drink! How about it?!

Hint: you're gonna end up with a winch handle or a shackle... and a 10mm Spectra lifeline...
__________________
s/v Jedi is offline   Reply With Quote
Old 24-05-2013, 13:01   #30
Registered User

Join Date: May 2012
Location: Baltimore, MD
Boat: Cal 2-27
Posts: 839
Re: dyneema/specta lifelines

Quote:
Originally Posted by s/v Jedi View Post
Okay, here it is: I invite Barnie to come along Jedi and find the sharpest thing on deck apart from the emergency knife and then try to cut my lifelines with it. I'll be nice and give him three slashes instead of just one. If he manages to cut it, I buy drinks and new lifelines; if he doesn't manage to cut it, he will buy everone in this thread a drink! How about it?!

Hint: you're gonna end up with a winch handle or a shackle... and a 10mm Spectra lifeline...
Do we get multiple drinks for multiple comments? I just want to know because it's been a long day and I need maybe more than just one beer.
__________________

__________________
76% of statistics are made up.
boatsail is offline   Reply With Quote
Reply

Tags
lifelines

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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



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

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


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:37.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.