[Public-List] Cockpit core thickness in early boats?

[Mike Lehman]

The older boats do not have a stuffing box on the rudder. Instead the tube 
is continuous from the hull to the underside of the cockpit. When motoring, 
or when the boat is sailing with the stern down, the water gushes up the 
tube and wets the underside of the cockpit sole. Over time this causes 
delamination of the cockpit sole.

-----Original Message----- 
From: Glennb
Sent: Sunday, March 25, 2012 3:09 AM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] Cockpit core thickness in early boats?

when I bought Dolce six years ago, the rudder tube mounted in the hull was 
packed with old grey putty around the shaft tube inside the hull.  The 
material had hardened over the years and was cracked and leaking a small but 
steady dribble that ran forward down  into the bilge.

if your rudder tube is leaking because of failure of this old putty 
material, you will probably be able to observe a greenish stain coming from 
the bronze tube running foward on the inside of the hull, where the water 
dribbles into the bilge. If so,  you can gouge out all this old material and 
fiberglass the tube in place, once you open up the cockpit floor.

alternatively, the tube itself uses an packing gland to seal water from 
entering the boat from around the rudder shaft.  takeoff the nut on top of 
the tube and renew the square packing material, hen tighten the nut back 
down significantly hard to stop water.  in this instance, watermcomes out of 
the top of the nut., whereas if the tube leaks at the base, water comes in 
at the hull joint.

I put an inspection plate in the cockpit floor over my rudder tube, so  I 
can access this thing for maintenance every few years.
Glenn P.
dolce 318



Sent from my iPad

On Mar 24, 2012, at 6:11 AM, Joseph Balderson <joebinc at gmail.com> wrote:

> I recall 7/16ths marine ply glued in with West. I ground the entire inside
> of the hull because my rebuild is rather extensive. So in the area of the
> rudder port (where it comes through the hull on the inside) I strenghtened
> the rudder port/ hull attachtment by adding biaxial cloth cut to fit and
> again placed with west epoxy. Where is the water coming in?
>
> On Fri, Mar 23, 2012 at 7:56 AM, Jeffrey <alberg30nh at gmail.com> wrote:
>
>> Hi Joseph,
>>
>> My boat #116 came just after yours, so ours are very likely similar.
>>
>> Do you remember the thickness of the plywood you used?  I don't 
>> understand
>> what you mean "retab in the rudder port"?? What will I find for the 
>> rudder
>> shaft opening when I get in there?? Any ways to stop water intrusion from
>> the rudder port??
>>
>> -Jeff
>>
>> On Fri, Mar 23, 2012 at 7:38 AM, Joseph Balderson <joebinc at gmail.com>
>> wrote:
>>
>>> That's right. I have #115. When I rebuilt my cockpit Masonite was the 
>>> wet
>>> laminate.  I set the router depth to just less than the cockpit
>> thickness,
>>> about 3/8ths+ or so and hogged out all but the bottom side fiberglass
>>> laminate. i then fit and glued in a marine ply filler laminate and
>> glassed
>>> over all. But............ I took the opportunity to frame in a flush
>> access
>>> hatch in the forward end of the cockpit (about 20"w x 30"l) and to retab
>> in
>>> the rudder port while all was open.
>>>
>>>
>>> On Thu, Mar 22, 2012 at 7:32 AM, Jeffrey <alberg30nh at gmail.com> wrote:
>>>
>>>> The cockpit floor of #116 is soft and needs a new core. Anyone know the
>>>> thickness of the core? In the liner boats, I've read 3/8 or 1/2.
>>>>
>>>> Also, has anyone done this in a pre-liner boat? I've read the core
>>> consists
>>>> of the bottom fiberglass, masonite, a heavy layer of fiberglass,
>> another
>>>> layer of masonite, then the top fiberglass skin. Sound right?
>>>>
>>>> For those who have done this, did you use one layer of core material,
>> or
>>>> two layers as in the original construction??
>>>>
>>>> -jeff
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Jeff Fongemie
>>>> #116 Seagrass
>>>>
>>>> http://picasaweb.google.com/fongemie
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>>> --
>>> Jeffrey Fongemie
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> <http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org>
>>>
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