Reply
 
Thread Tools Display Modes
 
Old 12-09-2012, 02:49 PM   #1
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Anchor Size/Type

I just watched a guy anchor what I would guess is about a 28' sailboat with three cinderblocks on about a 3 to 1 scope in 10' - 16' of water on a tidal river. Yes, I really did.

My question - Are three cinderblocks enough? Personally, I would have used at least five cinderblocks and a 7 to 1 scope!

According to my rangefinder, it's 147 yards off the marina dock so I'll check the next time I'm here (if it's still anywhere around).
__________________
Advertisement

rwidman is offline   Reply With Quote
Old 12-09-2012, 03:18 PM   #2
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 13,724
Well Ron apparently the guy feels about ONE cinderblock about the way Marin feels about one Bruce.
__________________

__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 12-09-2012, 03:22 PM   #3
Guru
 
City: Hotel, CA
Country: Fried
Join Date: Sep 2011
Posts: 8,328
If it was an all chain combination rode it may be sufficient only if the first 6 or so feet of chain is the extra heavy stuff found on the commercial boats in Alaska. Properly snubbed off of course
__________________
Craig

It's easier to fool people than to convince them that they've been fooled - Mark Twain
CPseudonym is offline   Reply With Quote
Old 12-09-2012, 03:28 PM   #4
TF Site Team
 
Larry M's Avatar
 
City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 5,750
These guys should have used the 3 blocks.
Attached Thumbnails
Click image for larger version

Name:	Picture 1032.jpg
Views:	110
Size:	92.9 KB
ID:	14618  
Larry M is offline   Reply With Quote
Old 12-09-2012, 06:20 PM   #5
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 7,579
Quote:
Originally Posted by rwidman View Post
I just watched a guy anchor what I would guess is about a 28' sailboat with three cinderblocks on about a 3 to 1 scope...
Excuse the antipodean ignorance, but what`s a cinderblock?
How many = a Bruce,a Super Sarca,CQR...
__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 12-09-2012, 07:27 PM   #6
Guru
 
caltexflanc's Avatar
 
City: North Carolina for now
Country: USA
Vessel Name: Small Incentive
Vessel Model: Boston Whaler 130 Sport
Join Date: Aug 2011
Posts: 3,803
Think about it. If it is the standard dual hole block, they could dig in real well. If true cinder blocks as opposed to concrete, they weigh about 30 pounds each. Sounds like over kill. Also something my old man would have come up with, except he was a sophisticated anchorer and used old anvils as kellets.

caltexflanc is offline   Reply With Quote
Old 12-09-2012, 07:30 PM   #7
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: 2011 Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 10,265
Not sure a cinder block would fit well on the bow.
__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 12-09-2012, 07:31 PM   #8
TF Site Team
 
dwhatty's Avatar
 
City: Home Port: Buck's Harbor, Maine
Country: USA
Vessel Name: "Emily Anne"
Vessel Model: 2001 Island Gypsy 32 Europa (Hull #146)
Join Date: Sep 2008
Posts: 2,733
I can see it now: Stainless steel cinder block holders available at West Marine.
__________________
David Hawkins
Deer Isle, Maine
dwhatty is offline   Reply With Quote
Old 12-09-2012, 07:53 PM   #9
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390


Three of these. No chain, just rope.

I called it a "sailboat" but it has no sail or mast. No motor either. The guy talked someone at the boat landing into towing it out into the river and then bringing him back. At least it's gone from the public boat landing after being tied up there for a month in everyone's way.
rwidman is offline   Reply With Quote
Old 12-09-2012, 08:28 PM   #10
Veteran Member
 
City: Pender Island
Country: Canada
Join Date: Nov 2012
Posts: 70
cinderroll anchor

I saw a toy trawler about 34feet with a unique anchoring system on his bow roller.......... It was a cinder block doubled and encased with chicken wire retrofitted with a roller ... I guess the idea was that when it hit the bottom it would roll allowing the cinderroll to dig into the mud ... he had painted it a dark blue to match his boat --- I talked with him and he was going to ask for "Dragon's Den" financial support for 20% of his future company--watch for it..... jp
Lucy 11 is offline   Reply With Quote
Old 12-09-2012, 09:36 PM   #11
Guru
 
Steve's Avatar
 
City: Thibodaux, Louisiana
Country: USA
Vessel Name: Gumbo
Vessel Model: 2003 Monk 36
Join Date: Oct 2007
Posts: 3,607
Quote:
Originally Posted by Larry M View Post
These guys should have used the 3 blocks.
Looks like he has a nice anchor wench though!
Steve is offline   Reply With Quote
Old 12-10-2012, 01:36 AM   #12
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 7,579
Quote:
Originally Posted by Lucy 11 View Post
I saw a toy trawler about 34feet with a unique anchoring system on his bow roller.......... It was a cinder block doubled and encased with chicken wire retrofitted with a roller
Tempted to ask if it was gal or ss chicken wire....
An improvisation which could get nicely stuck in mud. It`ll never catch on.

You never know when you need to improvise. Years ago we left the oars in the dinghy on the mooring to go racing in my sailboat. When we returned the oars were gone, replaced by 2 fence palings. We have a thoughtful class of thief round here.
__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 12-10-2012, 06:54 AM   #13
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,534
"they weigh about 30 pounds each."

Not submerged.
FF is offline   Reply With Quote
Old 12-10-2012, 10:58 AM   #14
Guru
 
Moonstruck's Avatar
 
City: Hailing Port: Charleston, SC
Country: USA
Vessel Name: Moonstruck
Vessel Model: Sabre 42 Hardtop Express
Join Date: Nov 2008
Posts: 7,854
I think the formula is depth of water divided by 3. So 10' divided by 3 =3.333. Thus he was in the range to anchor safely with 3 cinder block (as we call in our trade CMUs concrete masonry units) in normal conditions.
__________________
Don on Moonstruck
Sabre 42 Hardtop Express & Blackfin 25 CC
When cruising life is simpler, but on a grander scale (author unknown)
http://moonstruckblog.wordpress.com/
Moonstruck is offline   Reply With Quote
Old 12-10-2012, 11:40 AM   #15
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Here's a photo of the HMS POS before he had it towed out and "anchored".
Attached Thumbnails
Click image for larger version

Name:	e 003.jpg
Views:	104
Size:	88.4 KB
ID:	14634  
rwidman is offline   Reply With Quote
Old 12-10-2012, 12:59 PM   #16
Scraping Paint
 
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
On the other hand....... If the cinder block cluster has a self-burying action in the mud on the bottom of the river, it could act the same as a mushroom anchor. And mushroom anchors are used to anchor vessels like lightships and buoys in some pretty nasty conditions.

Not saying they would, just if.
Attached Thumbnails
Click image for larger version

Name:	Mushroom 1.jpg
Views:	107
Size:	103.3 KB
ID:	14635   Click image for larger version

Name:	Mushroom 2.jpg
Views:	103
Size:	132.0 KB
ID:	14637  
Marin is offline   Reply With Quote
Old 12-10-2012, 01:18 PM   #17
Guru
 
City: Hotel, CA
Country: Fried
Join Date: Sep 2011
Posts: 8,328
Quote:
Originally Posted by rwidman View Post
Here's a photo of the HMS POS before he had it towed out and "anchored".
Looks like it's only a year or two from going to a landfill... At the publics expense
__________________
Craig

It's easier to fool people than to convince them that they've been fooled - Mark Twain
CPseudonym is offline   Reply With Quote
Old 12-10-2012, 01:24 PM   #18
TF Site Team
 
Larry M's Avatar
 
City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 5,750
Quote:
Originally Posted by Marin View Post
On the other hand....... If the cinder block cluster has a self-burying action in the mud on the bottom of the river, it could act the same as a mushroom anchor. And mushroom anchors are used to anchor vessels like lightships and buoys in some pretty nasty conditions.

Not saying they would, just if.
If you are trying to show a mushroom anchor, I'm not sure that's an anchor on the bow of the boat? But maybe it is, just pulled in tight?
Larry M is offline   Reply With Quote
Old 12-10-2012, 01:33 PM   #19
TF Site Team
 
Larry M's Avatar
 
City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 5,750
Quote:
Originally Posted by Larry M View Post
If you are trying to show a mushroom anchor, I'm not sure that's an anchor on the bow of the boat? But maybe it is, just pulled in tight?

I guess it is (I answered my own question). Here's another lightship with a similar mushroom plus the traditional.
Attached Thumbnails
Click image for larger version

Name:	Lightship_Finngrundet.jpg
Views:	104
Size:	91.5 KB
ID:	14638  
Larry M is offline   Reply With Quote
Old 12-10-2012, 02:23 PM   #20
Scraping Paint
 
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
Quote:
Originally Posted by Larry M View Post
If you are trying to show a mushroom anchor, I'm not sure that's an anchor on the bow of the boat? But maybe it is, just pulled in tight?
It is, as you noted in your next post. And, somewhat surprising to me, the lightships, or at least the Columbia, only had the one. Given the storms they have to weather I initially thought they would have had two, bow and stern. But then it occurred to me that if these ships couldn't swing into the winds and waves they would be at serious risk of survival.

The mushroom anchor still perplexes me. I obviously don't understand its dynamics, but it seems to me based on just its appearance that it would have the least amount of holding under these situations. But it obviously has the most or they would not have used them in this application.
__________________

Marin is offline   Reply With Quote
Reply

Thread Tools
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 04:16 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012