Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-13-2020, 02:01 PM   #21
Veteran Member
 
City: Southport-ish
Country: Summerfield/San Diego
Vessel Name: Bad Idea
Vessel Model: 36 Albin
Join Date: Dec 2014
Posts: 33
I believe my 3 strand rope is the culprit to my chain twist. It doesn't seem to happen unless I get past the 75 feet of chain more than 10 ft.
__________________
Advertisement

__________________
Play stupid games... Win stupid prizes.
Joint Effort is offline   Reply With Quote
Old 10-14-2020, 12:41 PM   #22
TF Site Team
 
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 2,544
I used to deal with terrible chain twist. I have mixed rode 130 feet 5/16 chain and 150 of 5/8 3 strand. I've never anchored with more than 90 feet of chain. I have a notched/grooved roller.

I installed a Mantus swivel and I've never had an issue since.
__________________

Shrew is offline   Reply With Quote
Old 10-14-2020, 03:25 PM   #23
DDW
Guru
 
City: San Francisco
Country: USA
Join Date: Apr 2018
Posts: 1,320
Quote:
Originally Posted by Nomad Willy View Post
I think it’s the roller.
Look at the roller post#11. Far too big.
The horizontal chain links need to come at least half way up the sides to stabilize the chain re rolling.
The size of the roller has nothing to do with it. It is the section of the groove. Those rollers are that big for a reason having to do with the existing SS sprit which I did not want to modify. The groove was not arrived at by chance. I designed and printed several groove sections, testing each one. Since angled pull generally aggravates chain twist, I only printed the groove and one cheek to save print time. Tested by pulling chain over it at various angles, and manually twisting it as it was pulled. The tulip shape I arrived at for the forward most roller in post #11 will take chain at about a 40 deg angle without jumping out of the roller and is very resistant to twist. Here are a couple of test rollers. The one with a deeper more traditional groove will actually cause the chain to twist in an angled pull as the links get caught on the corners in the section and roll it. The other one allows the chain to slide into the groove, but the sides are sloped to support the horizontal links and in conjunction with the slight shoulder under those links is resistant to rolling. These rollers have eliminated chain twist as a consideration on my boat.



Here are the sections of those two, including the section of chain. The support against twisting the chain once in the groove is the same, but the tulip shape allows the chain to get there without rolling.

DDW is online now   Reply With Quote
Old 10-14-2020, 03:28 PM   #24
DDW
Guru
 
City: San Francisco
Country: USA
Join Date: Apr 2018
Posts: 1,320
Quote:
Originally Posted by Shrew View Post
I used to deal with terrible chain twist. I have mixed rode 130 feet 5/16 chain and 150 of 5/8 3 strand. I've never anchored with more than 90 feet of chain. I have a notched/grooved roller.

I installed a Mantus swivel and I've never had an issue since.
3 strand rope has a lot of torque which varies under load. That will definitely twist the chain unless you have a good swivel. With 8 plait or all chain, those problems disappear. Also, there are self righting anchors. My Spade for example, if it encounters the roller upside down will right itself as soon as it starts over the roller.
DDW is online now   Reply With Quote
Old 10-16-2020, 04:32 PM   #25
Member
 
City: Richmond VA
Country: Usa
Join Date: Aug 2019
Posts: 9
Quote:
Originally Posted by oscar View Post
Hmmmm, where do I find 300' of water on the Chesapeake?
You don't....

175 ' Right here....

Ric in Richmond is offline   Reply With Quote
Old 10-17-2020, 11:11 AM   #26
Senior Member
 
Nepidae's Avatar
 
City: Essington, PA.
Country: USA
Vessel Name: Nepidae
Vessel Model: Albin 43 Sundeck
Join Date: Jul 2013
Posts: 114
Anchor Chain Twist

We have @ 150' of chain followed by 200+' of 8 plait.

Every winter I remove the chain to 'wash' it. Washing is dropping it in a bucket while spraying it with some anticorrosive spray (CRC, etc). The chain is still clean with no rust and 10yrs old.

We anchor like you in the same conditions and depth.

I didn't see you mention a swivel, which we have, that not only doesn't twist the chain but provides for the anchor to be retrieved without being upside down and rolling over as it hits the bow roller.

We use a Mantus swivel (https://www.mantusmarine.com/mantus-swivel/). I remove the large bolt at the shackle to separate the chain from the anchor. I figure the it won't hurt the swivel to get some anticorrosive sprayed on it.

Don't know if it is the washing, the swivel or a combination, but we've never had a twisting issue with our chain.

Good luck.
__________________
​Best regards,
Charles
Charles Williamson
m/v Nepidae, Albin 43 Sundeck
Nepidae is offline   Reply With Quote
Old 10-17-2020, 11:44 AM   #27
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 17,165
DDW wrote;
“The size of the roller has nothing to do with it.”

Your rollers are even better but I was referring to the roller presented. In that case a bigger chain would ride higher up and higher up the V of the roller was a different shape.

But you’re right it’s all to do w the shape of the roller providing the chain isn’t too high.
However you do seem to allude that the roller high up may twist the chain if pulled from the side (at an angle). I think you’re right.
__________________
Eric

North Western Washington State USA
Nomad Willy is online now   Reply With Quote
Old Today, 01:03 PM   #28
TF Site Team
 
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 2,544
Quote:
Originally Posted by DDW View Post
Quote:
Originally Posted by Shrew View Post
I used to deal with terrible chain twist. I have mixed rode 130 feet 5/16 chain and 150 of 5/8 3 strand. I've never anchored with more than 90 feet of chain. I have a notched/grooved roller.

I installed a Mantus swivel and I've never had an issue since.

3 strand rope has a lot of torque which varies under load. That will definitely twist the chain unless you have a good swivel. With 8 plait or all chain, those problems disappear. Also, there are self righting anchors. My Spade for example, if it encounters the roller upside down will right itself as soon as it starts over the roller.
While I have no doubt you read my post, I feel like maybe you didn't completely comprehend it.
__________________

Shrew is offline   Reply With Quote
Reply

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





All times are GMT -5. The time now is 04:47 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×