Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 11-06-2019, 22:02   #1
Registered User

Join Date: Feb 2016
Posts: 63
Silencing Dyneema?

So how do you keep your Dyneema stays and shrouds from singing? My back stays (running and main) make the whole boat sing.

Under tension I have not found a good method for silencing them.
__________________

teppokurki is offline   Reply With Quote
Old 12-06-2019, 03:26   #2
Marine Service Provider

Join Date: Dec 2010
Location: Bristol RI
Boat: Cape George 31
Posts: 988
Re: Silencing Dyneema?

Usually some sort of spoiler is placed somewhere along them. People have recommended hoisting a fender halfway up a pumping mast; perhaps something a little less intrusive like a burgee that could double as a wind-direction indicator.
__________________

__________________
Ben
zartmancruising.com
Benz is offline   Reply With Quote
Old 12-06-2019, 03:45   #3
Registered User

Join Date: Mar 2014
Location: Caribbean
Boat: Lagoon 450
Posts: 884
Re: Silencing Dyneema?

AT anchor we have hoisted two lines on a spinnaker halyard and then wrapped around the side stays this stops the vibration. Friends with a dyneema stayed cat do the same.
Bean Counter is offline   Reply With Quote
Old 12-06-2019, 05:08   #4
Tim. Keith-Lucas

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 977
Re: Silencing Dyneema?

Your problem is a resonant frequency in the back stay. All physical objects have resonant freqencies, and engineers spend a lot of money getting them outside hearing range - remember when old cars boomed at particular speeds, and Comet jet airliners came apart in air?

That said, anything you do that changes the resonant frequency of your backstay will in turn make the new resonant frequency one that the mast etc. does not resonate at (wow) sympathetically. Loosen it, hang a fender on it, divide it in half by inserting a tie-off; just get in there and find what works and is convenient to your situation.
__________________
[/SIGPIC]
tkeithlu is offline   Reply With Quote
Old 12-06-2019, 07:01   #5
Registered User

Join Date: Feb 2016
Posts: 63
Re: Silencing Dyneema?

Thanks, I get the theory, but I am after practical tips that people have found useful and convenient. Like how wrapping the halyard around a forestay foil a few times kills the resonance wobble there.

Surely I am not the only one with the singin’ stays?
teppokurki is offline   Reply With Quote
Old 12-06-2019, 07:13   #6
Registered User

Join Date: Jun 2008
Posts: 298
Re: Silencing Dyneema?

Don't have the problem myself, but my first attempt would be to put a snatch block on the stay (I'm thinking backstays and runners) and then lead it forward and tension against something like the mast or toerail.
JayH is offline   Reply With Quote
Old 12-06-2019, 23:05   #7
Registered User

Join Date: Feb 2016
Posts: 63
Re: Silencing Dyneema?

Adding tension usually just changes the resonance frequency and does little to really silence the hum.

Additional blocks would not really work under way.
teppokurki is offline   Reply With Quote
Old 13-06-2019, 14:20   #8
Registered User

Join Date: May 2019
Posts: 5
Re: Silencing Dyneema?

Have you tried flying a small flag from the offending shrouds?
__________________

cpisz is offline   Reply With Quote
Reply

Tags
dyneema, enc

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Silencing Camfrano Fans rebel heart Plumbing Systems and Fixtures 12 27-07-2013 09:18
Silencing Squeaking Floor Boards . . . PatrickS Construction, Maintenance & Refit 14 31-05-2012 17:34
crazy idea for those with deep pockets, spectra (dyneema) anchor line schoonerdog Multihull Sailboats 22 27-10-2008 01:46
silencing generators malan_h Electrical: Batteries, Generators & Solar 15 26-01-2008 12:51



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:41.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.