Stus-List Re: Deck hold -down?

[Steve Thomas via CnC-List]

If the mast has "sunk" relative to the deck that would explain why the 
collar is being pulled down hard on the deck by the mast straps. Looks 
to me like the deck adjacent to the mast is being pushed down by the 
mast. Without the straps, there would be no compression.


Steve




   -- Original Message --
   From: cnc-list@cnc-list.com
   To: cnc-list@cnc-list.com
Cc: shawngwri...@gmail.com
   Sent: Wednesday, June 9, 2021 9:53 PM
   Subject: Stus-List Re: Deck hold -down?


On our 35-2, the area around the mast collar had wet core, and was 
repaired (drilled & filled with epoxy) by the previous owner 20 years 
ago. This area is now very solid, basically all epoxy. The mast collar 
has 4 bolts through the deck, but also a SS strap on each side, and 
these are connected below decks with a bolt though the mast, so most of 
the upward force on the collar is transferred to the mast, not the deck. 
Just had the mast out for the first time in 20 years when the work was 
done, and it still seems very solid.


Possibly adding the straps between the mast and collar (if they are 
absent) might help with your deck compression issue.




--
Shawn Wright
shawngwri...@gmail.com <mailto:shawngwri...@gmail.com>
S/V Callisto, 1974 C 35
https://www.facebook.com/SVCallisto 
<https://www.facebook.com/SVCallisto>






On Wed, Jun 9, 2021 at 10:06 AM Steve Thomas via CnC-List 
mailto:cnc-list@cnc-list.com> > wrote:


I have a C MK1, 1980 version, with the same problem. Starboard is 
worse than port but both stick up. When I bought the boat it had been 
sitting in the water at a Florida marina, untended for several years. 
There were 2 things I noticed that I think might be related. One is that 
the rig, though pinned, was quite loose at the time of purchase and one 
of the first things I did was take the slack out, not super tight, but 
snug. Two, there appears to be a lot of pressure exerted on the deck by 
the mast collar through the mast tangs and it looks like it is pulled 
down a quarter of an inch or more by looking at the headliner. My first 
suspicion was that there is rotten wood under the mast step but I can 
see no evidence of it and have not had the opportunity to unstep the 
mast yet. Perhaps the hull permanently deforms over time? I have thought 
of putting a shim in the step to bring the collar back up a bit.


Steve Thomas
Waiting out the pandemic in Ontario.

Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[Shawn Wright via CnC-List]

On our 35-2, the area around the mast collar had wet core, and was repaired
(drilled & filled with epoxy) by the previous owner 20 years ago. This area
is now very solid, basically all epoxy. The mast collar has 4 bolts through
the deck, but also a SS strap on each side, and these are connected below
decks with a bolt though the mast, so most of the upward force on the
collar is transferred to the mast, not the deck. Just had the mast out for
the first time in 20 years when the work was done, and it still seems very
solid.

Possibly adding the straps between the mast and collar (if they are absent)
might help with your deck compression issue.

--
Shawn Wright
shawngwri...@gmail.com
S/V Callisto, 1974 C 35
https://www.facebook.com/SVCallisto


On Wed, Jun 9, 2021 at 10:06 AM Steve Thomas via CnC-List <
cnc-list@cnc-list.com> wrote:

> I have a C MK1, 1980 version, with the same problem. Starboard is
> worse than port but both stick up. When I bought the boat it had been
> sitting in the water at a Florida marina, untended for several years. There
> were 2 things I noticed that I think might be related. One is that the rig,
> though pinned, was quite loose at the time of purchase and one of the first
> things I did was take the slack out, not super tight, but snug. Two, there
> appears to be a lot of pressure exerted on the deck by the mast collar
> through the mast tangs and it looks like it is pulled down a quarter of an
> inch or more by looking at the headliner. My first suspicion was that there
> is rotten wood under the mast step but I can see no evidence of it and have
> not had the opportunity to unstep the mast yet. Perhaps the hull
> permanently deforms over time? I have thought of putting a shim in the step
> to bring the collar back up a bit.
>
> Steve Thomas
>
> Waiting out the pandemic in Ontario.
> -- Original Message --
> From: cnc-list@cnc-list.com
> To: cnc-list@cnc-list.com
> Cc: rodf...@gmail.com
> Sent: Wednesday, June 9, 2021 7:24 AM
> Subject: Stus-List Deck hold -down?
>
>
>
>
>
> I have a C 36-1. There are stainless strap assemblies bolted through the
> main bulkhead port and starboard. These are welded to stainless pads bolted
> through the deck. I have removed the mounting bolts and the holes in the
> bulkhead are not elongated yet there is a gap of about 5/16" under the
> plate on the deck above. What is this for? I am guessing a deck hold--down,
> yet the deck appears to be firmly in contact with the bulkhead below. Has
> anyone else seen this? What have you done about it?
>
> Thanks
>
> Rod Fisk
> C 36 Corsair
> Oshkosh, WI
>
> Thanks to all of the subscribers that contributed to the list to help with
> the costs involved.  If you want to show your support to the list - use
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks
> - Stu
Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[John and Maryann Read via CnC-List]

Hi Rod

 

Our 34 uses the same construction.  The tangs are to hold the deck and bulkhead 
together.  Mine were leaking a bit some 20 years ago so pulled them, rebedded 
with butyl so there was flex.  No leaks since

 

John and Maryann

Legacy III

1982 C 34

Noank, CT

 

 

 

From: Rod Fisk via CnC-List [mailto:cnc-list@cnc-list.com] 
Sent: Wednesday, June 09, 2021 7:25 AM
To: cnc-list@cnc-list.com
Cc: Rod Fisk
Subject: Stus-List Deck hold -down?

 

Image removed by sender.




Image removed by sender.

Image removed by sender.



 

Image removed by sender.

I have a C 36-1. There are stainless strap assemblies bolted through the main 
bulkhead  port and starboard. These are welded to stainless pads bolted through 
the deck. I have removed the mounting bolts and the holes in the bulkhead are 
not elongated yet there is a gap of about 5/16" under the plate on the deck 
above. What is this for? I am guessing a deck hold--down, yet the deck appears 
to be firmly in contact with the bulkhead below. Has anyone else seen this? 
What have you done about it?

 

Thanks

 

Rod Fisk

C 36 Corsair

Oshkosh, WI

 

Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[Steve Thomas via CnC-List]

I have a C MK1, 1980 version, with the same problem. Starboard is 
worse than port but both stick up. When I bought the boat it had been 
sitting in the water at a Florida marina, untended for several years. 
There were 2 things I noticed that I think might be related. One is that 
the rig, though pinned, was quite loose at the time of purchase and one 
of the first things I did was take the slack out, not super tight, but 
snug. Two, there appears to be a lot of pressure exerted on the deck by 
the mast collar through the mast tangs and it looks like it is pulled 
down a quarter of an inch or more by looking at the headliner. My first 
suspicion was that there is rotten wood under the mast step but I can 
see no evidence of it and have not had the opportunity to unstep the 
mast yet. Perhaps the hull permanently deforms over time? I have thought 
of putting a shim in the step to bring the collar back up a bit.


Steve Thomas
Waiting out the pandemic in Ontario.
-- Original Message --
   From: cnc-list@cnc-list.com
   To: cnc-list@cnc-list.com
Cc: rodf...@gmail.com
   Sent: Wednesday, June 9, 2021 7:24 AM
   Subject: Stus-List Deck hold -down?






















I have a C 36-1. There are stainless strap assemblies bolted through 
the main bulkhead  port and starboard. These are welded to stainless 
pads bolted through the deck. I have removed the mounting bolts and the 
holes in the bulkhead are not elongated yet there is a gap of about 
5/16" under the plate on the deck above. What is this for? I am guessing 
a deck hold--down, yet the deck appears to be firmly in contact with the 
bulkhead below. Has anyone else seen this? What have you done about it?



Thanks


Rod Fisk
C 36 Corsair
Oshkosh, WI



Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[Donald Kern via CnC-List]

Shawn, My new holding tank is located on centerline below the v-berth.  
It was the largest I could fit through the aft access after removing the 
covers support pieces.  A little bit more plumbing lines required, a 
further forward than I like, but it is pumped out before racing for free 
- thank you Bristol Marine Center keeping our waters clean.


Don Kern
/Fireball, /C Mk2
Bristol, RI


On 6/9/2021 11:18 AM, Shawn Wright via CnC-List wrote:
Interesting, Don. Mine has some signs of patched holes on the deck, 
but I haven't been able to see anything below on the bulkheads. 
Possibly the deck holes are from something else.


So the holding tank was originally in that outboard area in the head? 
That explains the large hose hole at the bottom. My holding tank is 
now under the vberth, port side. It's a 16USG Kracor that fits ok, 
with a bit of crude surgery done to the plywood by a previous owner.




Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[Matthew via CnC-List]

I had them on my 1978 C 34, which is very similar to the 36 of the same
vintage.  My understanding was that they secured the deck to interior
bulkheads, but who knows.  I did not remove or seriously inspect any to
confirm.  I do know that boats of that vintage had a bulkhead tabbing
problem.  We had to push the main salon bulkheads back into place (using a
jack), re-tab the bulkheads, and put a wooden reinforcement piece between
the bulkheads at the top so the door would function properly.

 

Perhaps Rob Ball can enlighten us.

 

From: David Risch via CnC-List  
Sent: Wednesday, June 09, 2021 11:34 AM
To: Stus-List 
Cc: David Risch 
Subject: Stus-List Re: Deck hold -down?

 

There would not be as these deck straps were installed in the 1980s boats,
e.g. mine is 1981.

 

Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[Shawn Wright via CnC-List]

That explains why I can't find any holes below. Thanks, I will stop looking
for them, although it does make me wonder what the holes on deck were for.
Possibly mounts for the spin pole, or furling line fairleads, which used to
run along the base of the cabin top I think.
--

On Wed, Jun 9, 2021 at 8:34 AM David Risch via CnC-List <
cnc-list@cnc-list.com> wrote:

> There would not be as these deck straps were installed in the 1980s boats,
> e.g. mine is 1981.
>
>
>
>
>
Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[David Risch via CnC-List]

There would not be as these deck straps were installed in the 1980s boats, e.g. 
mine is 1981.

From: Donald Kern via CnC-List 
Sent: Wednesday, June 9, 2021 10:49 AM
To: Stus-List 
Cc: Donald Kern 
Subject: Stus-List Re: Deck hold -down?

Like Shawn's boat mine is also C 35 Mk2 (1974), but there is no indications 
of deck straps ever being installed.  Two years ago I removed the failed 
holding tank from its outboard location behind the outboard mahogany paneling. 
This required removing most of the head cabinetry, all of which was unattached 
to the overhead and only floating in the overhead's channels.  The only item 
that appears to secure the deck away from the the toe-rail are the hang tangs 
that are thru bolted to the mast.  The mast was removed since the boat winters 
in my side yard.  Also re-tabbed all the forward v-berth structures, since 
three quarters of the screws had worked loose due to hull flexing.  Yes the 
boat creaks when sailing, but after 40 years of sailing her you ignore that 
noise (also failing hearing??).

Don Kern
Fireball, C Mk2
Bristol, RI
On 6/9/2021 10:15 AM, Shawn Wright via CnC-List wrote:
My 35 mk2 apparently had these, but they have been removed. I have not seen a 
close up of any boats that still had them, so would be interested in some 
photos. I don't see any signs that anything was done to replace them with any 
kind if adhesive; the holes are just filled on the deck. The bulkheads do creak 
a bit as they move in the channels in the fiberglass liner, while under sail in 
a sea, or as they deck expands and contracts in the morning and evening, but I 
don't know if the straps would have made a difference for this. The space you 
describe under the deck pad may indicate a problem, although I can't imagine 
why this would happen, unless the deck is cored at that point and has 
collapsed, but 5/16" is quite a lot.
--
Shawn Wright
shawngwri...@gmail.com<mailto:shawngwri...@gmail.com>
S/V Callisto, 1974 C 35
https://www.facebook.com/SVCallisto<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.facebook.com%2FSVCallisto=04%7C01%7C%7C4d5b831a0b13402ea98c08d92b562620%7C84df9e7fe9f640afb435%7C1%7C0%7C637588471267473135%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000=nGfghG62%2ByrJR9pPac4khJIRiAWphDf0ZJczH5jZvZI%3D=0>


On Wed, Jun 9, 2021 at 4:25 AM Rod Fisk via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:

I have a C 36-1. There are stainless strap assemblies bolted through the main 
bulkhead  port and starboard. These are welded to stainless pads bolted through 
the deck. I have removed the mounting bolts and the holes in the bulkhead are 
not elongated yet there is a gap of about 5/16" under the plate on the deck 
above. What is this for? I am guessing a deck hold--down, yet the deck appears 
to be firmly in contact with the bulkhead below. Has anyone else seen this? 
What have you done about it?

Thanks

Rod Fisk
C 36 Corsair
Oshkosh, WI

Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   
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  Thanks - Stu



Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
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  Thanks - Stu

Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[Shawn Wright via CnC-List]

Interesting, Don. Mine has some signs of patched holes on the deck, but I
haven't been able to see anything below on the bulkheads. Possibly the deck
holes are from something else.

So the holding tank was originally in that outboard area in the head? That
explains the large hose hole at the bottom. My holding tank is now under
the vberth, port side. It's a 16USG Kracor that fits ok, with a bit of
crude surgery done to the plywood by a previous owner.

On Wed, Jun 9, 2021 at 7:51 AM Donald Kern  wrote:

> Like Shawn's boat mine is also C 35 Mk2 (1974), but there is no
> indications of deck straps ever being installed.  Two years ago I removed
> the failed holding tank from its outboard location behind the outboard
> mahogany paneling. This required removing most of the head cabinetry, all
> of which was unattached to the overhead and only floating in the overhead's
> channels.  The only item that appears to secure the deck away from the the
> toe-rail are the hang tangs that are thru bolted to the mast.  The mast was
> removed since the boat winters in my side yard.  Also re-tabbed all the
> forward v-berth structures, since three quarters of the screws had worked
> loose due to hull flexing.  Yes the boat creaks when sailing, but after 40
> years of sailing her you ignore that noise (also failing hearing??).
>
> Don Kern
> *Fireball, *C Mk2
> Bristol, RI
>
> On 6/9/2021 10:15 AM, Shawn Wright via CnC-List wrote:
>
> My 35 mk2 apparently had these, but they have been removed. I have not
> seen a close up of any boats that still had them, so would be interested in
> some photos. I don't see any signs that anything was done to replace them
> with any kind if adhesive; the holes are just filled on the deck. The
> bulkheads do creak a bit as they move in the channels in the fiberglass
> liner, while under sail in a sea, or as they deck expands and contracts in
> the morning and evening, but I don't know if the straps would have made a
> difference for this. The space you describe under the deck pad may indicate
> a problem, although I can't imagine why this would happen, unless the deck
> is cored at that point and has collapsed, but 5/16" is quite a lot.
> --
> Shawn Wright
> shawngwri...@gmail.com
> S/V Callisto, 1974 C 35
> https://www.facebook.com/SVCallisto
>
>
> On Wed, Jun 9, 2021 at 4:25 AM Rod Fisk via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>>
>>
>>
>>
>> I have a C 36-1. There are stainless strap assemblies bolted through
>> the main bulkhead  port and starboard. These are welded to stainless pads
>> bolted through the deck. I have removed the mounting bolts and the holes in
>> the bulkhead are not elongated yet there is a gap of about 5/16" under the
>> plate on the deck above. What is this for? I am guessing a deck hold--down,
>> yet the deck appears to be firmly in contact with the bulkhead below. Has
>> anyone else seen this? What have you done about it?
>>
>> Thanks
>>
>> Rod Fisk
>> C 36 Corsair
>> Oshkosh, WI
>>
>> Thanks to all of the subscribers that contributed to the list to help
>> with the costs involved.  If you want to show your support to the list -
>> use PayPal to send contribution --   https://www.paypal.me/stumurray
>> Thanks - Stu
>
>
> Thanks to all of the subscribers that contributed to the list to help with 
> the costs involved.  If you want to show your support to the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks - Stu
>
>
>
Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[Donald Kern via CnC-List]

Like Shawn's boat mine is also C 35 Mk2 (1974), but there is no 
indications of deck straps ever being installed.  Two years ago I 
removed the failed holding tank from its outboard location behind the 
outboard mahogany paneling. This required removing most of the head 
cabinetry, all of which was unattached to the overhead and only floating 
in the overhead's channels.  The only item that appears to secure the 
deck away from the the toe-rail are the hang tangs that are thru bolted 
to the mast.  The mast was removed since the boat winters in my side 
yard.  Also re-tabbed all the forward v-berth structures, since three 
quarters of the screws had worked loose due to hull flexing.  Yes the 
boat creaks when sailing, but after 40 years of sailing her you ignore 
that noise (also failing hearing??).


Don Kern
/Fireball, /C Mk2
Bristol, RI

On 6/9/2021 10:15 AM, Shawn Wright via CnC-List wrote:
My 35 mk2 apparently had these, but they have been removed. I have not 
seen a close up of any boats that still had them, so would be 
interested in some photos. I don't see any signs that anything was 
done to replace them with any kind if adhesive; the holes are just 
filled on the deck. The bulkheads do creak a bit as they move in the 
channels in the fiberglass liner, while under sail in a sea, or as 
they deck expands and contracts in the morning and evening, but I 
don't know if the straps would have made a difference for this. The 
space you describe under the deck pad may indicate a problem, 
although I can't imagine why this would happen, unless the deck is 
cored at that point and has collapsed, but 5/16" is quite a lot.

--
Shawn Wright
shawngwri...@gmail.com 
S/V Callisto, 1974 C 35
https://www.facebook.com/SVCallisto 


On Wed, Jun 9, 2021 at 4:25 AM Rod Fisk via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:









I have a C 36-1. There are stainless strap assemblies bolted
through the main bulkhead  port and starboard. These are welded to
stainless pads bolted through the deck. I have removed
the mounting bolts and the holes in the bulkhead are not elongated
yet there is a gap of about 5/16" under the plate on the deck
above. What is this for? I am guessing a deck hold--down, yet the
deck appears to be firmly in contact with the bulkhead below. Has
anyone else seen this? What have you done about it?

Thanks

Rod Fisk
C 36 Corsair
Oshkosh, WI

Thanks to all of the subscribers that contributed to the list to
help with the costs involved.  If you want to show your support to
the list - use PayPal to send contribution --
https://www.paypal.me/stumurray 
Thanks - Stu


Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu


Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[Shawn Wright via CnC-List]

My 35 mk2 apparently had these, but they have been removed. I have not seen
a close up of any boats that still had them, so would be interested in some
photos. I don't see any signs that anything was done to replace them with
any kind if adhesive; the holes are just filled on the deck. The bulkheads
do creak a bit as they move in the channels in the fiberglass liner, while
under sail in a sea, or as they deck expands and contracts in the morning
and evening, but I don't know if the straps would have made a difference
for this. The space you describe under the deck pad may indicate a problem,
although I can't imagine why this would happen, unless the deck is cored at
that point and has collapsed, but 5/16" is quite a lot.
--
Shawn Wright
shawngwri...@gmail.com
S/V Callisto, 1974 C 35
https://www.facebook.com/SVCallisto


On Wed, Jun 9, 2021 at 4:25 AM Rod Fisk via CnC-List 
wrote:

>
>
> I have a C 36-1. There are stainless strap assemblies bolted through the
> main bulkhead  port and starboard. These are welded to stainless pads
> bolted through the deck. I have removed the mounting bolts and the holes in
> the bulkhead are not elongated yet there is a gap of about 5/16" under the
> plate on the deck above. What is this for? I am guessing a deck hold--down,
> yet the deck appears to be firmly in contact with the bulkhead below. Has
> anyone else seen this? What have you done about it?
>
> Thanks
>
> Rod Fisk
> C 36 Corsair
> Oshkosh, WI
>
> Thanks to all of the subscribers that contributed to the list to help with
> the costs involved.  If you want to show your support to the list - use
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks
> - Stu
Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: Deck hold -down?

[David Risch via CnC-List]

In lieu of “gluing” the decks to the bulkheads (Rob Ball can better explain, 
but apparently boats were “breaking” when run aground…they thought this method 
would provide a bit of give).

Your problem of a proud horizontal deck piece?   Never encountered that.  But 
they are a constant target of leak management (re-bedding ).

From: Rod Fisk via CnC-List 
Sent: Wednesday, June 9, 2021 7:25 AM
To: cnc-list@cnc-list.com
Cc: Rod Fisk 
Subject: Stus-List Deck hold -down?

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I have a C 36-1. There are stainless strap assemblies bolted through the main 
bulkhead  port and starboard. These are welded to stainless pads bolted through 
the deck. I have removed the mounting bolts and the holes in the bulkhead are 
not elongated yet there is a gap of about 5/16" under the plate on the deck 
above. What is this for? I am guessing a deck hold--down, yet the deck appears 
to be firmly in contact with the bulkhead below. Has anyone else seen this? 
What have you done about it?

Thanks

Rod Fisk
C 36 Corsair
Oshkosh, WI

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