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07-04-2019, 01:02 PM
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#1
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Senior Member
City: Clear Lake Shores,Tx
Vessel Name: In Disguise
Vessel Model: 1985 Mainship 40 DC
Join Date: Aug 2014
Posts: 483
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Hull structural integrity
Ok, all you smart boat builder types:
I have a Luhrs Mainship 40DC. I want to basically gut the forward cabin, removing the platform the bed is made on...here's the question. Does that platform also perform double duty by strengthening and adding rigidity to the bow, or is it just a bed? Plan is to basically turn the forward cabin into a storage area for foodstuffs, etc when we do the Loop.
Thanks in response for your help.
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07-04-2019, 01:39 PM
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#2
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Guru
City: .
Vessel Name: GOTCHA
Vessel Model: Hatteras 58 LRC
Join Date: Jun 2019
Posts: 1,103
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Why no leave the platform in place and use as a storage platform.
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Captain F. Lee - R.P.E.
USCG 200 GT Master
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07-04-2019, 01:50 PM
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#3
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,185
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Quote:
Originally Posted by fgarriso
Why no leave the platform in place and use as a storage platform.
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+1. Then if you go to sell the boat you haven’t killed the resale value of the boat.
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07-04-2019, 02:00 PM
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#4
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Senior Member
City: Clear Lake Shores,Tx
Vessel Name: In Disguise
Vessel Model: 1985 Mainship 40 DC
Join Date: Aug 2014
Posts: 483
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Because that's not my plan. I'm looking for an answer to a specific question.
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07-04-2019, 02:03 PM
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#5
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Guru
City: .
Vessel Name: GOTCHA
Vessel Model: Hatteras 58 LRC
Join Date: Jun 2019
Posts: 1,103
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Quote:
Originally Posted by wyoboater
Because that's not my plan. I'm looking for an answer to a specific question.
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Do you have all of the original engineering specs.
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Captain F. Lee - R.P.E.
USCG 200 GT Master
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07-04-2019, 02:46 PM
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#6
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,143
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While most boat structures usually add to some structural stiffness...really hard to say without pics or familiarity with the boat.
My guess .......removal might be OK but keep the boat out of an Atlantic hurricane....but if you need original boat integrity, only someone with specs or a great backyard engineering eye with pics can help.
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07-04-2019, 02:49 PM
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#7
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Guru
City: San Francisco
Join Date: Apr 2018
Posts: 3,093
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Is the platform tabbed to the hull, or just set on the deck? If I was cutting things out tabbed to the hull, I would leave enough in place to act as stringers, or replace what I ground off with stringers. The usual concern is slamming loads, you want to break up the flat panels with something stiffer. The bed is not going to do much for torsion or bending in that area, but it may be substituting for stringers to resist slamming.
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07-04-2019, 04:10 PM
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#8
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Guru
Join Date: Oct 2007
Posts: 1,121
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Removing the bed completely will certainly lower the vessel value, regardless of whether it impairs hull integrity.
Not your plan but here is another idea!!
Leave the bed in place and cut access panels through the bed platform into the hull bilge area below. You might even be able to add a "floor" over that bilge section below the bed platform.
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07-04-2019, 04:31 PM
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#9
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Guru
City: .
Vessel Name: GOTCHA
Vessel Model: Hatteras 58 LRC
Join Date: Jun 2019
Posts: 1,103
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I have no idea how much "stuff" you are planning on storing in the bow or what the gross weight is, but their is a couple of things you should consider.
The center of Gravity of the vessel.
The center of Bouncy of the vessel.
The stability curve of the vessel.
If not done you could wind up with a boat that no longer has enough bow lift for its displacement.
You may think everything is fine until you hit a big roller and find it on deck with you.
That is just my humble opinion, and means less than nothing as far as your boat goes.
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Captain F. Lee - R.P.E.
USCG 200 GT Master
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07-04-2019, 04:44 PM
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#10
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,143
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That could be true if he left the bed and added all the foodstuff as planned.
Removing the bed may help stability, but certainly structure is a definite concern as opposed to user operation.
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07-04-2019, 09:02 PM
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#11
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Senior Member
City: Clear Lake Shores,Tx
Vessel Name: In Disguise
Vessel Model: 1985 Mainship 40 DC
Join Date: Aug 2014
Posts: 483
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PS Sneed. I appreciate your answer, it seems the only one even attempting to address the question I asked. As far as hatch openings in the bed platform, they're already there, just a pia to get in and out of all the time..that's what I'm trying to fix. As far as weight distribution, I don't think that will be an issue. As far as the resale value, this boat was never purchased as an investment. We bought it to use and we want to make it as comfortable for US as possible..I wasn't asking for a critique of the idea, just if it was possible without sacrificing the seaworthiness of the vessel.
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07-04-2019, 10:04 PM
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#12
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,143
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Thanks.. .it's just hard to give a better idea"old salt" opinion without seeing it.
Even resale is debatable as I know more than a few full time cruisers that convert now staterooms into storage, workshops, laundries, etc. And those boats get snapped up by other crusiers.
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07-05-2019, 12:08 AM
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#14
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Guru
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,609
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Quote:
Originally Posted by wyoboater
I wasn't asking for a critique of the idea, just if it was possible without sacrificing the seaworthiness of the vessel.
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And there is your answer. If you don't know if it's possible or not, then hire a marine architect who does know.
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07-05-2019, 12:52 AM
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#15
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Guru
City: Sydney
Vessel Name: Sojourn
Vessel Model: Integrity 386
Join Date: Oct 2011
Posts: 13,329
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Anything fixed to the inside of both sides of the hull is doing something,at the very least helping keep the two sides apart. Strength and stiffness too I expect. Don`t know how you determine how important or not it is, but tread carefully. Can you replace it with something less obtrusive or restrictive? An alloy tube laminated on?
As an analogy,we used to weld a steel tube between the McPherson Strut(?Slut) towers on rally cars.
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BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
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07-05-2019, 05:19 AM
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#16
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
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Will you be putting anything back that could act as structural reinforcement? Wondering if you're plan might include cabinets or shelving that could be tabbed in for rigidity.
To your original question, I would look at the construction of the bed to see how strong the material is. When redoing my 35 Bruno and Stillman V berth area, it was quite clear that the material used and fabrication wasn't structural for the hull, but then most of those boats were built for commercial fishing, not charter boats.
Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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07-05-2019, 05:38 AM
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#17
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Senior Member
City: Clear Lake Shores,Tx
Vessel Name: In Disguise
Vessel Model: 1985 Mainship 40 DC
Join Date: Aug 2014
Posts: 483
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Thanks Ted
That's what made me think of the question. The structure of the bed platform seems pretty solidly built, as if it might be designed for dual purpose. Yes, I plan on cabinets, shelves, but nothing stretching across the entire space.
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07-05-2019, 05:42 AM
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#18
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Senior Member
City: Clear Lake Shores,Tx
Vessel Name: In Disguise
Vessel Model: 1985 Mainship 40 DC
Join Date: Aug 2014
Posts: 483
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The Marine engineer idea has merit. I am just getting a general idea of the feasibility before I commit or not commit to the next step. Thanks.
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07-05-2019, 06:15 AM
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#19
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
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Quote:
Originally Posted by wyoboater
Thanks Ted
That's what made me think of the question. The structure of the bed platform seems pretty solidly built, as if it might be designed for dual purpose. Yes, I plan on cabinets, shelves, but nothing stretching across the entire space.
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Can you confirm that the hull where the bed attaches, is shaped with compound curves? Also is there a floor under the bed and a substantial bulkhead that separates the chain locker from the cabin?
Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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07-05-2019, 07:32 AM
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#20
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Senior Member
City: Clear Lake Shores,Tx
Vessel Name: In Disguise
Vessel Model: 1985 Mainship 40 DC
Join Date: Aug 2014
Posts: 483
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Ted.
Yes to both.
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