Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 24-05-2016, 11:46   #1
Registered User

Join Date: Oct 2014
Location: Marina Del Rey, CA
Posts: 331
UV affects to sails.

How bad UV affects to sail?
I have Kevlar laminated genoa on furler.
I usually take it down but may have to leave on couple of weeks.
__________________

__________________
cpt_757 is offline   Reply With Quote
Old 24-05-2016, 12:01   #2
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,789
Re: UV affects to sails.

Laminated sails are the worst affected by UV.

Get a sunbrella sock or take it down


Sent from my iPhone using Cruisers Sailing Forum
__________________

__________________
Sailmonkey is online now   Reply With Quote
Old 24-05-2016, 12:08   #3
Registered User

Join Date: Oct 2014
Location: Marina Del Rey, CA
Posts: 331
Re: UV affects to sails.

Quote:
Originally Posted by Sailmonkey View Post
Laminated sails are the worst affected by UV.

Get a sunbrella sock or take it down


Sent from my iPhone using Cruisers Sailing Forum
Thank you so much,
I thought so, too.
I could not take dow last time and gone so I start worrying about.
__________________
cpt_757 is offline   Reply With Quote
Old 24-05-2016, 23:52   #4
Registered User

Join Date: Nov 2012
Posts: 201
Images: 1
Re: UV affects to sails.

And a bit more advice: get the darkest sunbrella your first mate will allow. The darker it is, the more UV it blocks.

When we ordered new sails we went from beige to navy blue on the furling headsails' sun strips. We like that, too. (Our lazy bag is beige, but it has a liner inside that greatly increases the UV-blocking power.)
__________________
Lantau is offline   Reply With Quote
Old 25-05-2016, 09:23   #5
Registered User

Join Date: Apr 2013
Posts: 78
Re: UV affects to sails.

I'd give it one uncovered season to turn it
into confetti.
__________________
dick sargent is offline   Reply With Quote
Old 25-05-2016, 09:24   #6
Registered User

Join Date: Apr 2013
Posts: 78
Re: UV affects to sails.

One season uncovered equals confetti.
__________________
dick sargent is offline   Reply With Quote
Old 25-05-2016, 11:23   #7
Registered User

Join Date: Sep 2013
Location: San Francisco Bay
Boat: Chung Hwa Boat Builders, Magellan 36
Posts: 264
Re: UV affects to sails.

UV resistance is why dacron/terylene is still so popular
__________________
foufou is offline   Reply With Quote
Old 25-05-2016, 11:41   #8
Registered User

Join Date: Sep 2012
Posts: 4,974
Re: UV affects to sails.

While Dacron is quite UV resistant the thread or stiching not so much, that's where your failures will be when using Dacron sails. When I raced we never left a laminated sail furled, race over the sail was back in the bag.
__________________
robert sailor is online now   Reply With Quote
Old 25-05-2016, 12:48   #9
Registered User

Join Date: Dec 2014
Location: the Med
Boat: Nauta 54' by Scott Kaufman/S&S - 1989
Posts: 1,067
Images: 3
Re: UV affects to sails.

I think the Real issue is about the adesive within the laminate.

Per se, Kevlar, carbon or other fibers are, I guess, not that prone to collapse.
__________________
TheThunderbird is offline   Reply With Quote
Old 25-05-2016, 13:38   #10
Marine Service Provider

Join Date: May 2012
Location: New Orleans
Boat: We have a problem... A serious addiction issue.
Posts: 3,940
Re: UV affects to sails.

Quote:
Originally Posted by TheThunderbird View Post
I think the Real issue is about the adesive within the laminate.

Per se, Kevlar, carbon or other fibers are, I guess, not that prone to collapse.
Kevlar and all aramids are rapidly damaged by UV, the glues are actually pretty stable.

Dyneema/carbon sails are far more resistant to uv damage but at a major price penalty.
__________________
Greg

- If animals weren't meant to be eaten then they wouldn't be made of food.
Stumble is offline   Reply With Quote
Old 25-05-2016, 15:38   #11
Registered User

Join Date: Dec 2014
Location: the Med
Boat: Nauta 54' by Scott Kaufman/S&S - 1989
Posts: 1,067
Images: 3
Re: UV affects to sails.

Stumble

Thanks
__________________
TheThunderbird is offline   Reply With Quote
Old 25-05-2016, 16:43   #12
Marine Service Provider

Join Date: May 2012
Location: New Orleans
Boat: We have a problem... A serious addiction issue.
Posts: 3,940
Re: UV affects to sails.

I should have pointed out that the reason Kevlar sails fail (3dl etc) generally is because the Kevlar threads start to suffer uv damage, which reduces their strength. They still look fine but more and more load is being carried by the laminates. Eventually the laminate films fail and delaminate. So while it's true that the films fail before the thread failure becomes obvious typically it is the slow erosion of the threads that causes the damage.

Dyneema/carbon because it isn't damaged by uv nearly as much as Kevlar holds its strength far longer (thou even entirely creep becomes a concern) so less load is shifted to the film (cuben) or the glue (3di). Eventually they will all fail, but the time line is much longer.
__________________
Greg

- If animals weren't meant to be eaten then they wouldn't be made of food.
Stumble is offline   Reply With Quote
Old 25-05-2016, 16:59   #13
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,314
Re: UV affects to sails.

Kevlar hates UV and it hates being folded and flogged.

You can hoist a sock with a spin halyard. Make the sock tight (adjustable) and keep it tight otherwise it chafes the thread on the tapes.

b.
__________________
barnakiel is offline   Reply With Quote
Old 25-05-2016, 18:21   #14
Registered User

Join Date: Oct 2009
Location: australia
Boat: adams 35
Posts: 16
Re: UV affects to sails.

When I have used Kevlar it comes from the manufacturer wrapped in black polythene to keep the light out. It is a very light straw colour when unwrapped. If you leave it out in daylight it takes about three weeks to turn to a beige colour. This indicates that it has lost up to half its original tensile strength. After this it is reasonably stable.

As for laminates they have never really overcome the problem faced by a double column of soldiers marching round a corner. The inner column marks time while the outer has to take giant strides. When you apply this to fabric you stretch the outer fold or delaminate and cause a bubble on the inner. Plastic has a memory and thus every fold becomes a weak point.This is probably more of a problem than UV

Great for racers but its hard to go past dacron for long term cruising

My two bobs worth.
__________________
qwert is offline   Reply With Quote
Old 25-05-2016, 18:38   #15
Registered User

Join Date: Apr 2005
Location: Southern Calif.
Posts: 301
Re: UV affects to sails.

Most people in my marina (Dana Point) with laminate sails on furlers use the jib sleeve from ATN, it provides a little extra protection from unfurling in high winds also.
ATN Sailing Equipment | Genoa Sleeve
I'm REALLY happy with mine and I use for Dacron headsails also, I know it's a small thing but I've never liked the added weight of a Sunbrella sunband on a headsail.
__________________

__________________
Calif.Ted is offline   Reply With Quote
Reply

Tags
sail, sails

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Standing Rigging Affects Pointing? OldFrog75 Seamanship & Boat Handling 12 03-07-2014 08:04
Drastic affects of a fouled prop - Perkins 4-108 MikeNZ Engines and Propulsion Systems 0 18-01-2012 16:41
Wind Generator Affects Steering Ianm Seamanship & Boat Handling 17 09-07-2010 23:18
Waterway Closure Near Chicago - Affects Great Lakes Boats Transiting South to Gulf! teneicm Cruising News & Events 2 10-09-2009 12:49
Panama's new immigration law affects cruisers bruadair Atlantic & the Caribbean 11 07-07-2007 17:36



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:33.


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.