Re: M_Boats: Rebuilding bow ring reinforcement
Hmm, high density polyurethane foam would also be easy to shape and work with. I could also use HDPE maybe. I have a chunk of 1inch laying around. Any other opinions about the applicability of these materials? Dan Farrell M17 #301 casioqv@usermail.com wrote:
This polyurethane bow eye wedge could be an option to replace the wood backing if damaged:
https://www.catalinadirect.com/index.cfm/product/1110/plastic-backing-block-...
Sincerely, Tyler
----- Original Message ----- From: jerry@jerrymontgomery.org To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Tuesday, July 11, 2017 8:01:46 AM Subject: Re: M_Boats: Rebuilding bow ring reinforcement
The wood backup is there for two reasons- to spread the load, and to give the structure a bit of compressibility, which will keep tension on the U-bolt and keep it from unwinding.
I think there has been very little problem with it, in fact this is the first time I've heard of a problem, but like all exterior hardware it should be pulled off every few years and rebedded.
-----Original Message----- From: John Schinnerer Sent: Tuesday, July 11, 2017 6:03 AM To: montgomery_boats@mailman.xmission.com Subject: Re: M_Boats: Rebuilding bow ring reinforcement
My question would be, why was there a chunk of wood used there in the first place? Rather than just bolting it to the fiberglass, maybe with some kind of resin-based stiffener.
If there was a good reason why the wood was used - flexibility? Shock absorption? spreading the stress load? etc., I'd consider that when repairing.
If no functional reason - maybe it was just quicker and cheaper as a spacer - then your idea might be fine.
I think you mean fumed silica or amorphous silica though (the powdery forms)...'colloidal' means a suspension in a liquid, which probably wouldn't mix well with the epoxy... :-)
cheers, John S.
On 07/11/2017 03:48 PM, Dan Farrell wrote:
I recently discovered that the wood used to reinforce the bow ring if my '79 m-17 had been ruined by water intrusion. The fiberglass over it's top had collapsed.
I've removed the damaged fiberglass and the wood pulp, and was planning to glass over the area little by little from the bottom up, filling in the space formerly filled by wood with epoxy thickened with colloidal silica.
Does this seem like a poor plan to anyone?
Dan Farrell M17 #301
-- John Schinnerer - M.A., Whole Systems Design -------------------------------------------- - Eco-Living - Whole Systems Design Services People - Place - Learning - Integration john@eco-living.net - 510.982.1334 http://eco-living.net http://sociocracyconsulting.com
Because the term "ring" is used, I presume the bow "eye" is a single bolt model. Would it be better to switch to a U bolt with two bolts through the bow into a backing block for more strength? -----Original Message----- From: Dan Farrell <msog@danf.us> To: Msog List <montgomery_boats@mailman.xmission.com> Sent: Tue, Jul 11, 2017 1:00 pm Subject: Re: M_Boats: Rebuilding bow ring reinforcement Hmm, high density polyurethane foam would also be easy to shape and work with. I could also use HDPE maybe. I have a chunk of 1inch laying around. Any other opinions about the applicability of these materials? Dan FarrellM17 #301casioqv@usermail.com wrote:>This polyurethane bow eye wedge could be an option to replace the wood backing if damaged:>>https://www.catalinadirect.com/index.cfm/product/1110/plastic-backing-block-cp-22-c-22-c-25-bow-eye-c-27-bobstay.cfm>>Sincerely,>Tyler>>----- Original Message ----->From: jerry@jerrymontgomery.org>To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com>>Sent: Tuesday, July 11, 2017 8:01:46 AM>Subject: Re: M_Boats: Rebuilding bow ring reinforcement>>The wood backup is there for two reasons- to spread the load, and to give >the structure a bit of compressibility, which will keep tension on the >U-bolt and keep it from unwinding.>>I think there has been very little problem with it, in fact this is the >first time I've heard of a problem, but like all exterior hardware it should >be pulled off every few years and rebedded.>>-----Original Message----- >From: John Schinnerer>Sent: Tuesday, July 11, 2017 6:03 AM>To: montgomery_boats@mailman.xmission.com>Subject: Re: M_Boats: Rebuilding bow ring reinforcement>>My question would be, why was there a chunk of wood used there in the>first place? Rather than just bolting it to the fiberglass, maybe with>some kind of resin-based stiffener.>>If there was a good reason why the wood was used - flexibility? Shock>absorption? spreading the stress load? etc., I'd consider that when>repairing.>>If no functional reason - maybe it was just quicker and cheaper as a>spacer - then your idea might be fine.>>I think you mean fumed silica or amorphous silica though (the powdery>forms)...'colloidal' means a suspension in a liquid, which probably>wouldn't mix well with the epoxy... :-)>>cheers,>John S.>>>On 07/11/2017 03:48 PM, Dan Farrell wrote:>> I recently discovered that the wood used to reinforce the bow ring if my >> '79 m-17 had been ruined by water intrusion. The fiberglass over it's top >> had collapsed.>>>> I've removed the damaged fiberglass and the wood pulp, and was planning to >> glass over the area little by little from the bottom up, filling in the >> space formerly filled by wood with epoxy thickened with colloidal silica.>>>> Does this seem like a poor plan to anyone?>>>> Dan Farrell>> M17 #301>>>>-- >John Schinnerer - M.A., Whole Systems Design>-------------------------------------------->- Eco-Living ->Whole Systems Design Services>People - Place - Learning - Integration>john@eco-living.net - 510.982.1334>http://eco-living.net>http://sociocracyconsulting.com>
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