Stus-List Re: [EXTERNAL] Re: Balsa core history - problems and fixes

2021-09-17 Thread CHARLES SCHEAFFER via CnC-List 
Hey Steve,
Found a guy who is replacing damaged core in his hull, but it's a huricane 
damaged catamaran.  YouTube channel, "Parley Revival"

Episode 94 and 95, 96 show some good techniques.  You can fast forward through 
the goofy parts.  His videos are meant more to have fun, be funny, and 
entertain, than to be instructional.  Enjoy:

https://www.youtube.com/watch?v=EpgjUZoIzvc=322s

https://www.youtube.com/watch?v=2D7g57ptKAI=170s



Chuck S


> On 09/17/2021 4:34 PM Steve Thomas via CnC-List  
> wrote:
> 
> 
> All,
> Much has been written about the problem of wet balsa when and if it 
> happens and I have seen many methods better and worse for deck repairs. What 
> I have not seen are examples of how people have gone about repairing wet 
> cored areas of the hull. Any pointers other than "forget about it" would be 
> appreciated.
> 
> Steve Thomas
> 
> 
> > > 
> > -- Original Message --
> > From: cnc-list@cnc-list.com
> > To: cnc-list@cnc-list.com
> > Cc: joe.della.ba...@ssa.gov; strig...@eastlink.ca
> > Sent: Friday, September 17, 2021 1:32 PM
> > Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history
> > 
> > 
> > Yes that old foam is crap. The new Coosa 
> > https://coosacomposites.com/the-coosa-advantage/ and equivalents do not 
> > soak up water and are put together under tons of pressure.
> > 
> > 
> > From: Della Barba, Joe via CnC-List 
> >     Sent: September-17-21 11:21 AM
> > To: Stus-List 
> > Cc: Della Barba, Joe 
> > Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history
> > 
> > 
> > Typo
> > 
> > Water migrates slowly through end-grain balsa but really tears foam 
> > up
> > 
> > ---
> > 
> > Snip snip snip
> > 
> > 
> > 
> > Great info and research; so, how did balsa go from "wonder" 
> > material to; "bad stuff don't touch..."?
> > 
> > 
> > -
> > 
> > 
> > > 
> 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: [EXTERNAL] Re: Balsa core history - problems and fixes

2021-09-17 Thread CHARLES SCHEAFFER via CnC-List 
Hi Steve,

I saw a detailed hull repair done on a C designed Northeast 39 a few years 
back.

A hull repair is done the same way as a deck.  Cutting below the waterline, 
there are less fittings to work around, but the repair is upside down so vacuum 
bagging would really improve the result, the look and the strength of the job 
as it would pull any air trapped inside.

First step is to use a light hammer to tap the hull and locate the wet core and 
mark where to cut. 

I'll try and find those pictures for you.

Chuck



> On 09/17/2021 4:34 PM Steve Thomas via CnC-List  
> wrote:
> 
> 
> All,
> Much has been written about the problem of wet balsa when and if it 
> happens and I have seen many methods better and worse for deck repairs. What 
> I have not seen are examples of how people have gone about repairing wet 
> cored areas of the hull. Any pointers other than "forget about it" would be 
> appreciated.
> 
> Steve Thomas
> 
> 
> > > 
> > -- Original Message --
> > From: cnc-list@cnc-list.com
> > To: cnc-list@cnc-list.com
> > Cc: joe.della.ba...@ssa.gov; strig...@eastlink.ca
> >         Sent: Friday, September 17, 2021 1:32 PM
> > Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history
> > 
> > 
> > Yes that old foam is crap. The new Coosa 
> > https://coosacomposites.com/the-coosa-advantage/ and equivalents do not 
> > soak up water and are put together under tons of pressure.
> > 
> > 
> > From: Della Barba, Joe via CnC-List 
> >     Sent: September-17-21 11:21 AM
> > To: Stus-List 
> > Cc: Della Barba, Joe 
> > Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history
> > 
> > 
> > Typo
> > 
> > Water migrates slowly through end-grain balsa but really tears foam 
> > up
> > 
> > ---
> > 
> > Snip snip snip
> > 
> > 
> > 
> > Great info and research; so, how did balsa go from "wonder" 
> > material to; "bad stuff don't touch..."?
> > 
> > 
> > -
> > 
> > 
> > > 
> 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: [EXTERNAL] Re: Balsa core history - problems and fixes

2021-09-17 Thread dwight veinot via CnC-List 
I cut the outer fibreglass skin off with a rotary grinder. Nice straight
cuts and under the handrails after removing them.  I found the bad spots by
tapping with a hammer. Get a dull thud on tapping probably a wet rotten
spot. Dig out all the rotten stuff let dry and fill in with new half inch
thick end grain balsa matt. Use thickened polyester resin to apply and fill
like putty. Reinstall the fibreglass skin or just make a new one with
polyester resin and glass matt. Fill to surface with lightweight auto body
polyester filler and sand with a long sander. Paint with International
Brightside. Reinstall deck fittings. Good to go.

On Fri, Sep 17, 2021 at 5:34 PM Steve Thomas via CnC-List <
cnc-list@cnc-list.com> wrote:

> All,
> Much has been written about the problem of wet balsa when and if it
> happens and I have seen many methods better and worse for deck repairs.
> What I have not seen are examples of how people have gone about repairing
> wet cored areas of the hull. Any pointers other than "forget about it"
> would be appreciated.
>
> Steve Thomas
>
>
>
>
> -- Original Message --
> From: cnc-list@cnc-list.com
> To: cnc-list@cnc-list.com
> Cc: joe.della.ba...@ssa.gov; strig...@eastlink.ca
> Sent: Friday, September 17, 2021 1:32 PM
> Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history
>
> Yes that old foam is crap. The new Coosa
> https://coosacomposites.com/the-coosa-advantage/ and equivalents do not
> soak up water and are put together under tons of pressure.
>
> *From:* Della Barba, Joe via CnC-List 
> *Sent:* September-17-21 11:21 AM
> *To:* Stus-List 
> *Cc:* Della Barba, Joe 
> *Subject:* Stus-List Re: [EXTERNAL] Re: Balsa core history
>
> Typo
>
> Water migrates slowly through end-grain balsa but really tears foam up
>
> ---
> Snip snip snip
>
> 
>
> Great info and research; so, how did balsa go from "wonder" material to;
> "bad stuff don't touch..."?
> --
>
>
>
> 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

-- 
Sent from Gmail Mobile
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: [EXTERNAL] Re: Balsa core history - problems and fixes

2021-09-17 Thread Bill Coleman via CnC-List 
Matt can co-lead that discussion with Rob!

 

 

Bill Coleman

Entrada, Erie, PA

 

 

 

From: Steve Thomas via CnC-List [mailto:cnc-list@cnc-list.com] 
Sent: Friday, September 17, 2021 4:35 PM
To: cnc-list@cnc-list.com
Cc: Steve Thomas
Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history - problems and fixes

 

All,

Much has been written about the problem of wet balsa when and if it happens and 
I have seen many methods better and worse for deck repairs. What I have not 
seen are examples of how people have gone about repairing wet cored areas of 
the hull. Any pointers other than "forget about it" would be appreciated. 

Steve Thomas

 



-- Original Message --
From: cnc-list@cnc-list.com
To: cnc-list@cnc-list.com
Cc: joe.della.ba...@ssa.gov; strig...@eastlink.ca
Sent: Friday, September 17, 2021 1:32 PM
Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history

Yes that old foam is crap. The new Coosa 
https://coosacomposites.com/the-coosa-advantage/ and equivalents do not soak up 
water and are put together under tons of pressure.

From: Della Barba, Joe via CnC-List  
Sent: September-17-21 11:21 AM
To: Stus-List 
Cc: Della Barba, Joe 
Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history

Typo

Water migrates slowly through end-grain balsa but really tears foam up

--- 

Snip snip snip



Great info and research; so, how did balsa go from "wonder" material to; "bad 
stuff don't touch..."? 


  _  


 

 

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: [EXTERNAL] Re: Balsa core history - problems and fixes

2021-09-17 Thread Steve Thomas via CnC-List 


All,
Much has been written about the problem of wet balsa when and if it 
happens and I have seen many methods better and worse for deck repairs. 
What I have not seen are examples of how people have gone about 
repairing wet cored areas of the hull. Any pointers other than "forget 
about it" would be appreciated.


Steve Thomas




   -- Original Message --
   From: cnc-list@cnc-list.com
   To: cnc-list@cnc-list.com
Cc: joe.della.ba...@ssa.gov; strig...@eastlink.ca
   Sent: Friday, September 17, 2021 1:32 PM
   Subject: Stus-List Re: [EXTERNAL]   Re: Balsa core history


Yes that old foam is crap.  The new Coosa 
https://coosacomposites.com/the-coosa-advantage/ 
<https://coosacomposites.com/the-coosa-advantage/>  and equivalents do 
not soak up water and are put together under tons of pressure.



From: Della Barba, Joe via CnC-List 
Sent: September-17-21 11:21 AM
To: Stus-List 
Cc: Della Barba, Joe 
Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history


Typo
Water migrates slowly through end-grain balsa but really tears foam up
---
Snip snip snip



Great info and research; so, how did balsa go from "wonder" material to; 
"bad stuff don't touch..."?





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: [EXTERNAL] Re: Balsa core history

2021-09-17 Thread Rod Stright via CnC-List 
Yes that old foam is crap.  The new Coosa 
https://coosacomposites.com/the-coosa-advantage/ and equivalents do not soak up 
water and are put together under tons of pressure.

 

From: Della Barba, Joe via CnC-List  
Sent: September-17-21 11:21 AM
To: Stus-List 
Cc: Della Barba, Joe 
Subject: Stus-List Re: [EXTERNAL] Re: Balsa core history

 

Typo

Water migrates slowly through end-grain balsa but really tears foam up

 

From: Della Barba, Joe via CnC-List mailto:cnc-list@cnc-list.com> > 
Sent: Friday, September 17, 2021 10:18 AM
To: Stus-List mailto:cnc-list@cnc-list.com> >
Cc: Della Barba, Joe mailto:joe.della.ba...@ssa.gov> >
Subject: [EXTERNAL] Stus-List Re: Balsa core history

 

Time: I doubt anyone really thought through what balsa core would be like when 
it was 50-60-70 or more years old. A lot of things can go wrong with a lot of 
materials when past the half-century mark and headed towards 100.*

Bad Builders:  Some builders, mostly NOT C, were or are infamous for doing 
things wrong and having issues with relatively new boats.

Bad Owners: One unsealed thru-hull can eventually do a lot of damage.

 

* Our club uses Boston Whalers and we go through them. They eventually get 
saturated and weak, we send them to the dumpster, and get another one. Boston 
Whaler is a top builder and builds good boats, but decades of having the crap 
beat out of them eventually does them in, especially if any hull penetrations 
are not fixed ASAP. My Whaler is 51 years old and is still dry, it has never 
been a club boat and thus not beat like a rented mule by teenaged instructors. 
Note that the foam core in Whalers is MUCH WORSE than balsa once it gets wet. 
Water migrated through end-grain balsa, but it really tear up foam. I once went 
to put a thru-hull in a foam-core Krogen 42 and I got more than 50 gallons out 
of the core draining from the hole! That boat was essentially beyond repair, so 
it essentially got restricted to sheltered waters from then on.

 

Joe

Coquina

 

 

 

From: Richard Bush via CnC-List mailto:cnc-list@cnc-list.com> > 
Sent: Friday, September 17, 2021 9:18 AM
To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> 
Cc: cscheaf...@comcast.net <mailto:cscheaf...@comcast.net> ; Richard Bush 
mailto:bushma...@aol.com> >
Subject: [EXTERNAL] Stus-List Re: Balsa core history

 

Great info and research; so, how did balsa go from "wonder" material to;  "bad 
stuff don't touch..."? 

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: [EXTERNAL] Re: Balsa core history

2021-09-17 Thread Della Barba, Joe via CnC-List 
Typo
Water migrates slowly through end-grain balsa but really tears foam up

From: Della Barba, Joe via CnC-List 
Sent: Friday, September 17, 2021 10:18 AM
To: Stus-List 
Cc: Della Barba, Joe 
Subject: [EXTERNAL] Stus-List Re: Balsa core history

Time: I doubt anyone really thought through what balsa core would be like when 
it was 50-60-70 or more years old. A lot of things can go wrong with a lot of 
materials when past the half-century mark and headed towards 100.*
Bad Builders:  Some builders, mostly NOT C, were or are infamous for doing 
things wrong and having issues with relatively new boats.
Bad Owners: One unsealed thru-hull can eventually do a lot of damage.

* Our club uses Boston Whalers and we go through them. They eventually get 
saturated and weak, we send them to the dumpster, and get another one. Boston 
Whaler is a top builder and builds good boats, but decades of having the crap 
beat out of them eventually does them in, especially if any hull penetrations 
are not fixed ASAP. My Whaler is 51 years old and is still dry, it has never 
been a club boat and thus not beat like a rented mule by teenaged instructors. 
Note that the foam core in Whalers is MUCH WORSE than balsa once it gets wet. 
Water migrated through end-grain balsa, but it really tear up foam. I once went 
to put a thru-hull in a foam-core Krogen 42 and I got more than 50 gallons out 
of the core draining from the hole! That boat was essentially beyond repair, so 
it essentially got restricted to sheltered waters from then on.

Joe
Coquina



From: Richard Bush via CnC-List 
mailto:cnc-list@cnc-list.com>>
Sent: Friday, September 17, 2021 9:18 AM
To: cnc-list@cnc-list.com
Cc: cscheaf...@comcast.net; Richard Bush 
mailto:bushma...@aol.com>>
Subject: [EXTERNAL] Stus-List Re: Balsa core history

Great info and research; so, how did balsa go from "wonder" material to;  "bad 
stuff don't touch..."?
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