Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-03-2024, 10:05 AM   #1
Senior Member
 
City: Mystic
Join Date: Apr 2022
Posts: 154
GB Stem Thickness

Does anyone know the thinkness of the GB stem (fore/aft) well above the waterline?
Am considering drilling and thru-bolting a well caulked eye-bolt into the chain locker to accept the bitter-end of anchor rode.
Outside of bolt would exit stem, well above waterline, and be backed with fender washer or backing plate and locknut - all 3/4" stainless.
Had a similar setup on a sailboat once to accept backing plate for inner forestay.
Figured the stem is one of the strongest parts of the boat and a good place to secure a bitter end if it ever came to being necessary to accept a substantial load.
All the woodwork and bulkhead structure inside just seem too flimsy to me.
Anyone ever drilled a hole competely fore/aft thru their GB stem at chainlocker level?
If so, how thick is it?
Will find out myself soon enough but looking to see if anyone has ever done this.
Please advise.
Thanks
Mac G is online now   Reply With Quote
Old 02-03-2024, 10:15 AM   #2
Senior Member
 
City: Mystic
Join Date: Apr 2022
Posts: 154
BTW - I intend to caulk and epoxy the crap out of it so water intrusion and movement will be a non-issue.
Mac G is online now   Reply With Quote
Old 02-03-2024, 11:20 AM   #3
Guru
 
Nick F's Avatar
 
City: Vancouver
Vessel Name: Callisto
Vessel Model: 1974 Grand Banks 42 Classic, Hull 433
Join Date: Sep 2020
Posts: 570
Following
Nick F is offline   Reply With Quote
Old 02-03-2024, 11:55 AM   #4
Senior Member
 
City: Mystic
Join Date: Apr 2022
Posts: 154
Clarification: Fiberglass GB, not a woodie.
Mac G is online now   Reply With Quote
Old 02-03-2024, 01:41 PM   #5
Valued Technical Contributor
 
DavidM's Avatar
 
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,759
I don’t think you will have a problem with a 3/4” eye bolt in the stem. I bet it is solid glass, 1-1/2-2” thick there.

David
DavidM is offline   Reply With Quote
Old 02-03-2024, 04:51 PM   #6
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,064
I understand a reason to secure the end of your anchor tackle, but why the need to lift the boat by it?

I could see the eye bolt on the outside for lower rode connection or a towing point with minimal chafe....but doesn't securing the chain/rode from runaway only need to stop from losing the bitter end from departing the boat?

It wouldn't take that amount of securing by a long shot and isn't the anchor tackle usually secured for even storm conditions above deck? Why have the strongest part below deck where chafe/sawing would cause an issue?

Sorry about not just answering your question, but I am curious as to why you are planning this project.
psneeld is offline   Reply With Quote
Old 02-03-2024, 04:58 PM   #7
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 2,093
An eyebolt exists in your chain locker already. Also, it’s probably best to tie a rope line to the bolt inside the locker and extend it to the deck. Then splice it to the chain. That way you could cut the rope in case you have to move under emergency conditions.
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Old 02-03-2024, 05:06 PM   #8
Senior Member
 
City: Mystic
Join Date: Apr 2022
Posts: 154
I want the very bitter end secured in case the windlass breaks, snubbers part, the deckhand screws up or max scope needs to be released and no one pays attention to how much is actually left.
Current set-up is just a tie-off to a large object that cannot physically fit out the deck hawser but that seems bush-league and would just induce upward strain on and in wrong direction on the deck in a manner it was not designed to accommodate.
Am a heavy-duty overkill guy who tries to plan ahead and think of all the possible things that could go wrong so I can address them and put them out of my mind.
Loosing entire anchor rode overboard is something I never want to have to worry about no matter who is running the foredeck.
Currently the GB (at least mine) provides no padeye or proper fitting for this down below unlike other boats i have seen.
And that surprised me for an otherwise well thought out and well made vessel.
I have no problem drilling holes in my boat if the end result is to improve the situation.
Also learned long ago to never assume the prior owner knew what they were doing.
Need to look at everything with fresh eyes and anticipate and plan for problems so they don't happen.
Thanks for asking
Mac G is online now   Reply With Quote
Old 02-03-2024, 05:10 PM   #9
Senior Member
 
City: Mystic
Join Date: Apr 2022
Posts: 154
Quote:
Originally Posted by Giggitoni View Post
An eyebolt exists in your chain locker already. Also, itís probably best to tie a rope line to the bolt inside the locker and extend it to the deck. Then splice it to the chain. That way you could cut the rope in case you have to move under emergency conditions.
Unfortunately my vessel is lacking that eyebolt you mentioned.
Yes i will tie line to my new setup so it can be cut in emergency.
Am going to splice in a special lanyard for this.
Thank you
Mac G is online now   Reply With Quote
Old 02-03-2024, 05:10 PM   #10
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,064
I think you are seeing a problem that is bigger than what other's do.

You boat, your decision but you are the first in my career of boating that sees it this way.
psneeld is offline   Reply With Quote
Old 02-03-2024, 06:09 PM   #11
Guru
 
Jeff F's Avatar
 
City: Guelph
Vessel Name: Escapade
Vessel Model: 50` US Navy Utility trawler conversion
Join Date: Nov 2015
Posts: 2,432
Quote:
Originally Posted by Mac G View Post
Unfortunately my vessel is lacking that eyebolt you mentioned.
Yes i will tie line to my new setup so it can be cut in emergency.
Am going to splice in a special lanyard for this.
I have a similar arrangement, and added a short length of line as you propose. No further concerns for me.

There are lots of snubber arrangements to relieve the windlass or chain end attachment of undue stress.
Jeff F is offline   Reply With Quote
Old 02-03-2024, 06:44 PM   #12
Senior Member
 
City: Mystic
Join Date: Apr 2022
Posts: 154
Quote:
Originally Posted by psneeld View Post
I think you are seeing a problem that is bigger than what other's do.

You boat, your decision but you are the first in my career of boating that sees it this way.
Currently have nothing below strong enough to accomodate bitter end.
Just flimsy plywood interior trim, etc. Not going to rely on inadequate attachment point so will add my own.

You are an accident investigator, right?
Please see the attached.

Am someone who learns from the mistakes of others (in addition to my own) and never skimp on safety. Used to be in commercial tramp-shipping so picked up info from those big boys that I apply on my own smaller scale now.

And the fact that no one else ever does it this way is a compliment to me as I am an out-of-box thinker always looking for ways to improve on what other humans think they know. So thank you!
Attached Thumbnails
Lost Bitter End.JPG   Lost Anchor.JPG   Accident Report.JPG   Bitter End.JPG  
Mac G is online now   Reply With Quote
Old 02-03-2024, 06:50 PM   #13
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,064
OK, I give up...if you equate those accidents to our scale, I see I am not getting through.

Based on my posts, most will agree I too am a out of the box thinker, but veering too far from the norm doesn't always make it right either.

Large vessel anchoring and our boats can't be scaled down...they have a different practice altogether.
psneeld is offline   Reply With Quote
Old 02-03-2024, 07:06 PM   #14
Guru
 
City: Rochester, NY
Vessel Name: Hour Glass
Vessel Model: Chris Craft 381 Catalina
Join Date: Aug 2019
Posts: 7,463
I wouldn't anchor it to something flimsy, but the large object to jam against the deck method should work fine. The deck already holds the loads from the windlass, and on many setups, cleats as well. So with the rode being led forward off the windlass (or through a hole in the deck if the windlass was somehow broken away) the loading should be fairly horizontal to the deck, not the strong upward pull you're imagining. So I doubt the deck would end up being too weak to handle it.
rslifkin is offline   Reply With Quote
Old 02-03-2024, 07:16 PM   #15
Guru
 
SteveK's Avatar
 
City: Gulf Islands, BC Canada
Vessel Name: Sea Sanctuary
Vessel Model: Bayliner 4588
Join Date: Jul 2019
Posts: 4,915
Quote:
Originally Posted by rslifkin View Post
I wouldn't anchor it to something flimsy, but the large object to jam against the deck method should work fine. The deck already holds the loads from the windlass, and on many setups, cleats as well. So with the rode being led forward off the windlass (or through a hole in the deck if the windlass was somehow broken away) the loading should be fairly horizontal to the deck, not the strong upward pull you're imagining. So I doubt the deck would end up being too weak to handle it.
That is an excellent observation.
The mounting bolt through is on the underside where a padeye can be added.
__________________
SteveK
You only need one working engine. That is why I have two.
Sea Sanctuary-new to me 1992 Bayliner 4588
SteveK is online now   Reply With Quote
Old 02-03-2024, 07:20 PM   #16
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,064
If all your deck hardware, the deck, and windlass fails.... really?

I might look into those weaknesses as if I have to hang my trawler from a reinforced stem, those are conditions that I hope to never be in or at least aboard for.
psneeld is offline   Reply With Quote
Old 02-03-2024, 09:06 PM   #17
TF Site Team
 
koliver's Avatar
 
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,652
Quote:
Originally Posted by rslifkin View Post
I wouldn't anchor it to something flimsy, but the large object to jam against the deck method should work fine. The deck already holds the loads from the windlass, and on many setups, cleats as well. So with the rode being led forward off the windlass (or through a hole in the deck if the windlass was somehow broken away) the loading should be fairly horizontal to the deck, not the strong upward pull you're imagining. So I doubt the deck would end up being too weak to handle it.
I once had a wave lift the anchor out of its bow fitting and the chain jump off the Gypsey and then run away. With 300 feet of chain, it took quite a while for much of the chain to leave and as I had slowed the boat, I had time to figure out how to stop the running away, then wind it back in.
That is not the point though, but it gave me real evidence of just how fast (slow) that runaway of the anchor and chain occurs. If allowed to run all the way out, likely taking 3 to 5 times the time it takes you to react and correct the runaway, it is running out at a rate that equals the speed your anchor and chain fall through the water. That is not something that accelerates. Once 100 feet, or even 50 feet is out, it has reached its maximum speed. Then if it reaches the end and you have the bitter end of the rode fastened to a 2x4 so that it can't all leave, it won't extert enough force on the bottom of the hole in the deck to do any damage.

My boat is a 1980 C&L 44, looks like Marine Trader as it is probably from their hull and deck molds, so likely construction is no more robust, MacG, than your GB 42. My deck at the chain hole is 3/4 ply, glass, then teak cover. Likely that is the same as yours.
__________________
Keith
koliver is offline   Reply With Quote
Old 02-03-2024, 10:18 PM   #18
Senior Member
 
City: Poulsbo
Vessel Name: Water Music
Vessel Model: Grand Banks 49 classic
Join Date: Jun 2015
Posts: 218
Do you have a line attached to the end of you chain to allow cutting with a knife if you ever need to drop the chain and anchor overboard? That line would attach to the eye bolt or pad eye in your chain locker.

After the anchor is hoisted in to position on the pulpit with the winch I use a second line which has a hook that hooks into the anchor, the line then belay to a cleat which secures the anchor independent of anchor winch chain.
DennisB1 is offline   Reply With Quote
Old 02-04-2024, 05:12 AM   #19
Senior Member
 
City: Mystic
Join Date: Apr 2022
Posts: 154
Yes. The end is line that can be cut.
Problem is there is no padeye or fitting presently.
Rather than relying on loose object to prevent line from exiting deck fitting would prefer dedicated fixed tie-off point visible inside chain locker.
Existing woodwork below in that area is furniture quality not structural.
Could spend a lot of time and effort modifying and beefing up bulkhead area to accept the installation of a padeye
Or alternatively could drill one single 3/4 hole.
And mount one single 3/4 inch eye bolt.'
Very simple.
Very strong.
Minimal effort.
Maximum result.
Problem solved.
On to next project....

Thank you
Mac G is online now   Reply With Quote
Old 02-04-2024, 05:25 AM   #20
Senior Member
 
City: Mystic
Join Date: Apr 2022
Posts: 154
Quote:
Originally Posted by DavidM View Post
I donít think you will have a problem with a 3/4Ē eye bolt in the stem. I bet it is solid glass, 1-1/2-2Ē thick there.

David
Thank you for answering my question!
Mac G is online now   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


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 08:28 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012