I am just finishing the rebuild of the mast step on my 30-1. It was not high 
tech at all like the later boats, using cross-wise stringers made of plywood 
which had fiberglass on the top and sides but not on the bottom where the water 
gathers. After 36 years and a couple of repairs, they were soggy! Deciding that 
letting water sit in the deep part of the sump, where only a small bilge pump 
would fit and when clogged up with some gunk or pieces of delaminating plywood, 
would fail, requiring the removal of the mast to replace, I dumped three quarts 
of West epoxy down there to create a small slope from front to rear and get the 
water back into the area where an installed bilge pump is accessible. I did it 
in stages with slow hardener, which avoided the heat problem and then covered 
it with a layer of cloth/mat. Three new stringers, each made of two sandwiched 
¾ inch UHMW (almost as hard as the red stuff, but easier to machine) now sit on 
top of that new sloped area to keep it dry. I put a piece of 2” PVC pipe around 
the one keel bolt to allow access. I hope it will outlive the rest of the boat. 

 

Gary Nylander 30-1 #593

 

From: CnC-List <cnc-list-boun...@cnc-list.com> On Behalf Of Ken Heaton via 
CnC-List
Sent: Wednesday, April 11, 2018 9:54 AM
To: cnc-list <cnc-list@cnc-list.com>
Cc: Ken Heaton <kenhea...@gmail.com>
Subject: Re: Stus-List Mast step Stringers

 

" Any thoughts on injecting epoxy? "

 

It will take a lot of epoxy if the floors are mostly hollow.  And beware of 
heat if a large amount of epoxy is curing in an enclosed space.  Perhaps the 
slowest possible hardener in the mix?

 

I am not an expert...

 

Ken H.

 

 

On 11 April 2018 at 10:48, Brian Fry via CnC-List <cnc-list@cnc-list.com 
<mailto:cnc-list@cnc-list.com> > wrote:

Thank you Ken.. Very helpful. I will take another look. I do have an access 
hole drilled thru one of the stringers to be able to torque one of the bolts, 
If I recall it is not hollow. There are also bilge drain holes from bay to bay, 
again they are not hollow.

 

I agree the drawings show no material inside, but then what would the mast step 
plate be screwed to? 

 

My concern is that they are bulging. 

I take it yours don't have the bulging issue?

 

Any thoughts on injecting epoxy?

Thanks again.

 


Message: 4
Date: Wed, 11 Apr 2018 06:27:52 -0300
From: Ken Heaton <kenhea...@gmail.com <mailto:kenhea...@gmail.com> >
To: cnc-list <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> >
Subject: Re: Stus-List Mast step stringers
Message-ID:
        <caabfp6tcwvtcrwge5y3x_1k3t21an8xbkdf6xqzjy9rkkuy...@mail.gmail.com 
<mailto:caabfp6tcwvtcrwge5y3x_1k3t21an8xbkdf6xqzjy9rkkuy...@mail.gmail.com> >
Content-Type: text/plain; charset="utf-8"

Hello Brian,

I would be very surprised to find there was any wood inside the 'stringers'
on a C&C 37/40.  There is no mention of wood used in any part of this
boat's construction anywhere (except in the sole, in bulkheads and
cabinetry) in any documents I have see for these hulls.

I was sure the `stringers` were either completely hollow or there was
perhaps foam inside, but only to hold their shape while they are tabbbed to
the hull on initial construction.  One `stringer` just aft of the two that
support the mast step, has a large hole drilled in the top to access a keel
bolt.  It is completely hollow.


Here is a link to the construction drawing for that hull:

Here: https://drive.google.com/file/d/0B7X4Y5iVFYAKYTJxRDJBc3BvLWM/ 
<https://drive.google.com/file/d/0B7X4Y5iVFYAKYTJxRDJBc3BvLWM/view?usp=sharing> 
view?usp=sharing

and here: https://drive.google.com/file/d/0B7X4Y5iVFYAKcDd4ZlhWNGZzdmM/ 
<https://drive.google.com/file/d/0B7X4Y5iVFYAKcDd4ZlhWNGZzdmM/view?usp=sharing> 
view?usp=sharing

Ken H.



On 10 April 2018 at 22:37, Brian Fry via CnC-List <cnc-list@cnc-list.com 
<mailto:cnc-list@cnc-list.com> >
wrote:

> 1993 37/40.
> Redoing the rod rigging, mast is down. Removed the aluminum mast step to
> media blast and powder coat.
> There are three `stringers` the mast step sits on. The forward and aft
> stringers,which the step is bolted to, are bulging. Tapping on them reveals
> a delamination inside.
> I am thinking this is caused by forces from the adjustable mast crushing
> the laminate wood inside. The bay this is in is too high to be caused by
> water intrusion.
> Anyone else experiencing this?
> The plan is to drill holes and inject epoxy, then bolt on a suupport piece
> of 1/2" aluminum across the face, bolted into the solid parts of the
> stringer.
> Any input is welcome.
>
> S/V La Neige
> 1993 C&C 37/40 XL
> Havre de Grace , MD
> FB blog : thenext14years
> Brian and Manon
>
> _______________________________________________
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
>
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------------------------------

Message: 5
Date: Wed, 11 Apr 2018 09:20:27 -0300
From: Ken Heaton <kenhea...@gmail.com <mailto:kenhea...@gmail.com> >
To: cnc-list <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> >
Subject: Re: Stus-List Mast step stringers
Message-ID:
        <caabfp6tplokmqxxsubhrhwfnwrydpgws7ws9pevyadblr06...@mail.gmail.com 
<mailto:caabfp6tplokmqxxsubhrhwfnwrydpgws7ws9pevyadblr06...@mail.gmail.com> >
Content-Type: text/plain; charset="utf-8"

Part 2

Hi Brian,

The  'stringers' you refer to are the Structural Floors I think.  Those
drawings can be downloaded from the links provided.  They are big, about 3'
by 4' so it is best to download them and view them in a pdf viewer that
will let you zoom way in.

There is a detail on those drawings as follows:

STRUCTURAL FLOORS
1. 2 LAYERS KEVLAR HYBRID
2. 1 LAYER KEVLAR HYBRID ON TOP ONLY
3. 3 LAYERS OF 18oz./1oz. FABMAT

Here is a link to that detail from the Construction Drawing:
https://3.bp.blogspot.com/-ZlxOeqGWYe0/Ws39SyZcQGI/AAAAAAAB1fc/0fUCvVSqzqYEHiiwFZ67HeLvKyk0Lsr1gCLcBGAs/s1600/Construction%2BDetail%2Bfor%2Bthe%2B37%252B%2BMay%2B28%252C%2B1988-1.jpg

Ken H.




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Thanks everyone for supporting this list with your contributions.  Each and 
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