[Public-List] Bulkheads

[Jonathan Bresler via Public-List]

Thinking about chainplate covers.
Schaefer covers have been mentioned a few times in the thread.
Schaefer appears to have covers for 1-1/4"x1/8" chainplates (84-88/84-78)
and covers for 1-1/2"x1/4" chainplates (84-90/84-80) as well as smaller and
larger
chainplates.  Our chainplates are 1-1/4"x3/16", if I measured and noted the
sizes correctly.

Guessing that folks are using the  covers for 1-1/2"x1/4" chainplates
(84-90/84-80) ?

Jonathan

On Fri, Feb 5, 2016 at 9:20 AM, Jonathan Bresler <262alberg30 at gmail.com>
wrote:

> Backing up a moment, Don mentioned:
>
> "The backstay chainplate offers a different problem. There is a moment of
> force there because of the design. The top bolt is aft of all the the
> others because *the chainplate is angled aft at the top*. Thus if the top
> bolt fails from a bad knee, then the leverage is increased on the lower
> bolts and shear is more likely. As the chainplate revolves around the
> bottom bolt as the others shear, and it holds because there is no longer a
> moment to shear it, once straight with the stay, there is a major overload
> in a straight pull to cause the shear then, and there is no deck that can
> hold that so the backstay flies free."
>
> Needless to say, this scared the "stuffing" out of me particularly as it
> does not match what I remember seeing in #262.....hurriedly went to the
> boat last night to check.   To my relief, the backstay chainplate is
> installed through the deck and bolted to the knee at an angle in line with
> the backstay.
>
> Did Whitby change the installation of the backstay chainplate at some
> point ?
>
> Jonathan
>
> P.S.  backstay chainplate is 1-1/4" x 3/16" x 6" (below deck) with 5/16"
> bolts, 1/2" pin in the chainplate and 1/4" 1x19 stainless steel wire
> backstay.
>
> On Fri, Feb 5, 2016 at 8:16 AM, Jason S via Public-List <
> public-list at lists.alberg30.org> wrote:
>
>> I also have had good luck with 3M4000 series UV..Very good seal and no
>> cracking or seperation from chainplates or deck areas after 2 seasons.
>>
>> Jason
>> #457
>> www.svsalacia.blogspot.com
>> On Feb 5, 2016 8:05 AM, "via Public-List" <public-list at lists.alberg30.org
>> >
>> wrote:
>>
>> >
>> >
>> > For caulking chainplates I have tried numerous products over the 38
>> years
>> > we have owned the boat...my current favorite is 3M4000 UV.
>> >
>> >
>> > Mike Lehman
>> >
>> > ~~/)~/)~~
>> >
>> >
>> >
>> >
>> >
>> >
>> > On Thu, Feb 4, 2016 at 2:56 PM -0800, "Stephen Gwyn via Public-List" <
>> > public-list at lists.alberg30.org> wrote:
>> >
>> >
>> >
>> >
>> >
>> >
>> > So what are people's favourite sealant? I've been using
>> > BoatLife polysulfide sealant. Polyurethane  (3M5200 and Sikaflex)
>> > is too permanent. Silicone is permanent enough and once you
>> > use it, nothing will stick to where it has been.
>> >
>> > I was reading a british sailing, which recommended a butyl sealant
>> > which stayed sticky indefinitely, meaning that when the seal flexed
>> > and split, it would just seal itself again.
>> >
>> > Thoughts?
>> >
>> > SG
>> >
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>
>
>
> --
> Jonathan M Bresler
> Alberg 30 #262
> Annapolis/Eastport MD
>



-- 
Jonathan M Bresler
Alberg 30 #262
Annapolis/Eastport MD