Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-12-2007, 10:24   #1
Registered User

Join Date: Nov 2007
Posts: 3
mooring size??

Just a simple question....I hope.

I have a private mooring on rocky bottom with a 4,000 lb. concrete block. I am upgrading to a 41 foot sailboat with aprox 20,000 lb displacement.
Is this block heavy enough to secure a boat of this size in normal conditions and in winds of 30 to 40 kts?

thanks Rick
__________________

__________________
Contrails II is offline   Reply With Quote
Old 09-12-2007, 10:58   #2
Senior Cruiser
 
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
I'm not an expert on this subject, but for what it's worth:

The moorings in Avalon harbor are 2 ton concrete blocks, which go to boats like mine in the 43' loa / 26K displacement. Not sure if that's the city being cheap, but it's held me fast, although I've haven't sat out that much wind. Close, but not that much.

Never heard of anyone dragging a 2 ton concrete block though. They get partially submerged depending upon the bottom too.
__________________

__________________
rebel heart is offline   Reply With Quote
Old 09-12-2007, 12:29   #3
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
This was brought up a couple weeks ago. Go here; Mooring-building one
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 09-12-2007, 12:53   #4
Senior Cruiser
 
JusDreaming's Avatar

Cruisers Forum Supporter

Join Date: Jul 2004
Location: Stuart, FL & Bahamas Cruising
Boat: Lagoon 37
Posts: 880
Images: 13
a good article http://www.hazelettmarine.com/pdf/Ch...g%20Report.pdf
__________________
Denny and Diane
Lagoon 37
http://www.svjusdreaming.bravehost.com/
http://www.sailblogs.com/member/svjusdreaming/
"The only way to get a good crew is to marry one." -Eric Hiscock
JusDreaming is offline   Reply With Quote
Old 09-12-2007, 13:59   #5
Registered User

Join Date: Oct 2007
Location: Southern California
Boat: Was - Passport 45 Ketch
Posts: 837
Far more important than the mooring size is the mooring attachments.

I was in Hawaii when we were forced onto moorings by the state and I was on the Embarcadaro moorings in San Diego. In both cases, the mooring blocks were 2-ton and I never heard of them being drug.

However, in both cases the State was responsible for maintaining the fastenings to the mooring blocks and in both cases there were several incidents of failure in either the chain or the fasteners.

In most cases, the failure was in the shackle that fastened the chain to the mooring block. In some cases it was the poor splicing of the thimble in the nylon rode. The thimble would turn in the line and chafe through it. It was supposedly inspected by divers or actual lifting of the block (by barge and crane) every year.

When I first took my mooring in San Diego, I dove on it myself. I found the shackle bolt completely unscrewed and ready to fall out. I went out and purchased my own shackle, installed it and wired it. I also replaced their cheap, junk chain with 1/2" ships chain for the 1st 15', shackled to 20' of 3/8" BBB then I replaced the Nylon mooring line with 3/4" high quality line that I slpiced myself. I wouldn't trust them to do anything.
__________________
Kanani is offline   Reply With Quote
Old 09-12-2007, 23:12   #6
Marine Service Provider
 
GMac's Avatar

Join Date: Oct 2005
Location: North of the Bridge, thankfully
Boat: R930
Posts: 1,659
Quote:
Originally Posted by Contrails II View Post
Just a simple question....I hope.

I have a private mooring on rocky bottom with a 4,000 lb. concrete block. I am upgrading to a 41 foot sailboat with aprox 20,000 lb displacement.
Is this block heavy enough to secure a boat of this size in normal conditions and in winds of 30 to 40 kts?

thanks Rick
The block could very easily weigh less when sitting on the seabed, it's a concrete thing. Saying that it is quite possible that it is plenty if shaped well and depending what's coming off it. With a well build mooring any load should 'just' be starting to be felt by the weight in 40knts odd.

It's not 'normal' condition's you need to worry about, it's the ab-normal that will be the problem time.
__________________

__________________
GMac is offline   Reply With Quote
Reply

Tags
mooring

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
Mooring-building one aldiver Anchoring & Mooring 15 29-11-2007 00:42
Mooring? Zach General Sailing Forum 13 24-09-2007 17:38
anchoring vs mooring Sand Dollar Seamanship & Boat Handling 22 16-03-2007 12:51
mooring unbusted67 General Sailing Forum 9 24-12-2006 19:04
Bahamian Mooring Charlie Seamanship & Boat Handling 26 01-05-2006 16:26



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:53.


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.