Anchoring, Chain Only - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 16 Old 06-08-2010 Thread Starter
Junior Member
 
Join Date: Jun 2008
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Anchoring, Chain Only

Hi,

I recently returned from a ten day charter in the BVI. Had a wonderful time with nine people aboard a 47 foot cat.

I have an anchoring question...

This was the fourth time I have chartered. All previous charters had some length of chain and a lot of anchor line. The anchor line was always marked at 10 foot intervals. I would always put out 5 to 1 or more of total anchor line. Would reverse and set the anchor. This boat had only chain and not a whole lot of it. Any time I anchored, I would try to set the anchor with some reverse engine. The anchor would never grab solid. Is there something I should have known?
ScituateMan is offline  
Sponsored Links
Advertisement
 
post #2 of 16 Old 06-08-2010
Glad I found Sailnet
 
Bene505's Avatar
 
Join Date: Jul 2008
Posts: 3,842
Thanks: 15
Thanked 54 Times in 53 Posts
Rep Power: 13
   
Can you say more? How long was the chain? How deep was the water? And how high above the water was the anchor roller?

Regards,
Brad

.
.
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
.
The best minds discuss sailing (and a little bit of politics). I don't know why. It's a mystery!
.
Bene505 is offline  
post #3 of 16 Old 06-08-2010
Anchorsmith
 
Craig Smith's Avatar
 
Join Date: Jun 2006
Posts: 257
Thanks: 0
Thanked 5 Times in 4 Posts
Rep Power: 14
 
How the anchor sets isn't really affected by the make-up of the rode; if anything, chain should be slightly beneficial. It sounds like you didn't have enough to get adequate scope but without more details it's guessing.

Craig Smith

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Sailnet Disclosure: Craig is the son of the designer of Rocna and has a financial interest in its success.
Craig Smith is offline  
 
post #4 of 16 Old 06-08-2010
Senior Member
 
Join Date: Jul 2009
Location: South Florida
Posts: 201
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
 
Send a message via Skype™ to oceanscapt
It might be that you were backing down too fast. One of the virtues of nylon rode is that it stretches and the pull on the anchor is a bit smoother than chain.

Did you go to the same anchorages? Did you anchor in water shallow enough for the 5:1 scope to take effect?

Capt. Douglas Abbott
USCG/MCA IV/C.I./M.I. 500-ton Oceans
PADI MSDT

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
oceanscapt is offline  
post #5 of 16 Old 06-09-2010
Senior Member
 
Zanshin's Avatar
 
Join Date: Aug 2006
Location: Germany
Posts: 2,444
Thanks: 0
Thanked 35 Times in 33 Posts
Rep Power: 14
 
Most anchorages in the BVI are pretty shallow and have good holding (JVD's Great Harbor excepted on the 'holding'). I think that the charter boats all have 80-100 of chain at minimum. Anchorages will usually be under 30' deep over sand so most anchors tend to hold well and with all-chain even a 3:1 should be sufficient for both setting and holding. I wonder if, as mentioned by oceanscapt, the power of two engines in reverse was just too much. I like to let the wind "set" the anchor and then let out the rest of the scope and then use reverse to check holding - when I've used reverse to set the anchor I've had it skip over the bottom and often have to try again.
Which anchorages did you have these problems in?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Zanshin is online now  
post #6 of 16 Old 06-09-2010
Puget Sound Pounder
 
kellysails's Avatar
 
Join Date: Nov 2008
Location: Bainbridge Island, Port Madison, WA
Posts: 659
Thanks: 24
Thanked 8 Times in 8 Posts
Rep Power: 11
 
I always let the wind take the boat back and never put it into reverse until I have a good amount of scope out first. Even if the wind takes the boat sideways that is fine. The anchor needs to ease into the seabed. After you get 5x scope out really drive the anchor in with half power in reverse (1500 rpm), but start with a slow soft throttle first.

The more chain you have the better it is. While in Greece we had over 200 feet of all chain and it set every time. It is also interesting to snorkel over the anchor as the helmsmen puts in the final power to set it. You can learn much on how an anchor works by doing that.

-craig

Last edited by kellysails; 06-09-2010 at 10:31 AM.
kellysails is offline  
post #7 of 16 Old 06-09-2010
Salty Dog
 
Saildoggie's Avatar
 
Join Date: Aug 2008
Posts: 120
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
 
I charter cats frequently in the BVI's and all of them are chain rode only which works very well, the cat should come with 200' of chain which is standard.

A simple set into the wind, backing slowly as you pay out the chain, let it settle, you can reverse at low RPM to see if it is dragging, then add the bridle before any more than 1,000 RPM then back down at 2,000 RPM with the bridle on.
I like to snorkel the set after to assure it is dug in properly.

An over 40 victim of fate


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Saildoggie is offline  
post #8 of 16 Old 06-09-2010
Senior Member
 
AdamLein's Avatar
 
Join Date: Nov 2007
Location: SF Bay area
Posts: 1,940
Thanks: 9
Thanked 7 Times in 6 Posts
Rep Power: 12
 
In addition to the "let it settle before backing down" suggestion, another common problem is stopping the boat, dropping the anchor, and letting out all the rode in one go, and then backing down. You don't want a pile of chain sitting on top of your anchor. Instead, let out rode only until the anchor touches bottom, and then let boat drift back as suggested above, paying out more chain as you go. Snub it when you get to the desired scope (or better, snub at a greater scope and then reel a bit of it in after the anchor is set).

s/v Laelia - 1978 Pearson 365 ketch
AdamLein is offline  
post #9 of 16 Old 06-10-2010 Thread Starter
Junior Member
 
Join Date: Jun 2008
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Thanks for the info everyone. I forgot to mention in my first message that I didn't know how much total chain there was and it wasn't marked with intervals. It made me think that with all chain all I was supposed to do was just drop it to the bottom. From your replies it sounds like the procedure isn't any different. Zanshin, you mentioned something about Great Harbor on Jost Van Dyke. This is the place that worried me the most. We anchored in 30 - 35 ft, I put out all I had and still dragged when reversing to 1200 RPM. Perhaps 1200 with two engines was too much power (as someone suggested)?
ScituateMan is offline  
post #10 of 16 Old 06-10-2010
Puget Sound Pounder
 
kellysails's Avatar
 
Join Date: Nov 2008
Location: Bainbridge Island, Port Madison, WA
Posts: 659
Thanks: 24
Thanked 8 Times in 8 Posts
Rep Power: 11
 
Hmmm, not sure but you would require at least 120 - 140 feet of chain to meet 4x scope.

On a different note. I learned this trick a few years back from a person who has done dozens of charter trips.
Marking the chain. Use different color cable/wire ties for chain markers. It is really important to know (prior to leaving the dock) exactly how much rode you have in the bow locker and to ensure that you mark it. Using very small plastic cable/wire ties it is fairly easy to mark the rode (chain or rope) using a color coded cable/wire tie system. Last time we used yellow, red, black, white, and green. The black ties were a bit hard to see as the windlass was feeding out the rode. I used about 6-7 wire ties for a mark. It is a hassle to pull all the chain out of the locker and stretch it along the deck to mark it but well worth it. It is also 10x cheaper than the purpose built plastic markers that you can buy from a marine store.

ps - I never cut the ties off after my charter, I also leave the depth key taped to the anchor locker. I assume the charter company does not mind, never have heard a complaint.

-craig

Last edited by kellysails; 06-10-2010 at 10:28 AM.
kellysails is offline  
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Anchoring without chain Classic30 Gear & Maintenance 30 04-03-2014 06:50 PM
Do chain hooks weaken chain? pdqaltair Gear & Maintenance 5 01-14-2014 04:30 PM
Chain to chain connectors on anchor chain kwaltersmi Gear & Maintenance 12 10-16-2013 09:24 AM
Anchoring, chain diameter is a big difference? uri General Discussion (sailing related) 28 10-27-2011 08:50 AM
Chain Stopper or Chain Tensioner? 1970Columbia34 Gear & Maintenance 14 03-19-2007 11:43 AM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome