Do I need the bulkheads? - SailNet Community
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post #1 of 14 Old 04-26-2015 Thread Starter
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Do I need the bulkheads?

The previous owner of my Helms 25 removed the bulkheads that the stays are attached to. Do I need replace these or can I get away with just backing it with a large plate to spread the force?
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post #2 of 14 Old 04-26-2015
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Re: Do I need the bulkheads?

You need 'em.....

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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post #3 of 14 Old 04-26-2015
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Re: Do I need the bulkheads?

yea verily ....

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post #4 of 14 Old 04-26-2015
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Yeah, you need them unless you would really like to become very well acquainted with your mast at a very inopportune time. Or the sea bottom. Or both.
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post #5 of 14 Old 04-26-2015
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Re: Do I need the bulkheads?

I'll be the dissenting opinion... you really likely only need them if you plan to sail the boat. If you never put sails on, you should be good.

Sorry... not meaning to belittle the problem, but yeah they are structural.

"Rum Line" an S2 7.9 - cheap, fast, trailerable, and paid for.
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post #6 of 14 Old 04-27-2015
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Re: Do I need the bulkheads?

Quote:
Originally Posted by cmetzbower View Post
The previous owner of my Helms 25 removed the bulkheads that the stays are attached to. Do I need replace these or can I get away with just backing it with a large plate to spread the force?
It all depends on how the boat was designed & built.

On most boats the deck is not designed to take shroud loads.

Bulkheads can be designed to do one or multiple jobs.
  1. Transfer shroud / chainplate load to the hull
  2. Reinforce / strengthen the hull
  3. Divide the hull into sections (rooms)

I don't know the Helms 25 - but it's likely that the bulkhead does all three, with the last being least important.
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post #7 of 14 Old 04-27-2015 Thread Starter
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Re: Do I need the bulkheads?

Ok, thank you. I was unsure if they served a structural purpose or not.
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post #8 of 14 Old 04-27-2015
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Re: Do I need the bulkheads?

The original designer of your Helms probably thought that the bulkheads were needed structural support for the hull and why it was built that way.

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post #9 of 14 Old 05-22-2015
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Re: Do I need the bulkheads?

Hi Chris,

Or, put them in for hull support and move the shrouds to the outside hull maybe and put long strong pads under them and good backer plates inside the hull....... S'a thought....
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Last edited by NJAYNES; 05-22-2015 at 03:56 PM. Reason: afterthought - DO need those bulkheads..
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post #10 of 14 Old 05-23-2015
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Re: Do I need the bulkheads?

When you put the chain plates on the hull, the deck acts as a longitudinal bulkhead. There is no way a vertical pull on a chain plate will force a deck inwards, taking the load on edge.

Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"
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