We finally got a break in temperatures yesterday. I took advantage of this to remove my prop shaft. The hardest part was getting the transmission flange of the end of the shaft. Now to get the cutlass bearing out.
Cheers, Mac McKenzie Worthy Pearl C&C 37 1983 > On Mar 1, 2014, at 8:16 PM, [email protected] wrote: > > Send CnC-List mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of CnC-List digest..." > > > Today's Topics: > > 1. Re: Exhaust Riser Replacement (Gary Nylander) > 2. Re: Help me win a free sail! (Joel Aronson) > 3. Help understanding composites ([email protected]) > 4. Re: Help understanding composites (Jim Watts) > 5. Re: Help understanding composites (Chuck S) > 6. Re: Exhaust Riser Replacement (dwight) > 7. Re: Help understanding composites (dwight) > 8. Re: Help understanding composites (Graham Collins) > 9. Re: Help understanding composites (Ken Heaton) > 10. Re: Help understanding composites (Ken Heaton) > 11. Re: Help understanding composites ([email protected]) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 1 Mar 2014 12:25:55 -0500 > From: "Gary Nylander" <[email protected]> > To: <[email protected]> > Subject: Re: Stus-List Exhaust Riser Replacement > Message-ID: <F7920040145A4AABB80FC97508748F08@GaryPC> > Content-Type: text/plain; charset="iso-8859-1" > > Hey folks, black pipe works quite well..... > > Gary > ----- Original Message ----- > From: dwight > To: [email protected] > Sent: Saturday, March 01, 2014 4:48 AM > Subject: Re: Stus-List Exhaust Riser Replacement > > > Bob > > > > I could not find out what if any surface pre treatment is required on the > metal parts before you apply this paint, only the cure process. I wonder > where it is used on re-entry vehicles having worked for years studying fire > barrier coating materials like intumescent paints; usually an "R" factor is > involved too. What did you do to the metal before applying it? > > > > What is the cost of that paint? Did you check on the cost of stainless > steel pipe and elbows? I don't remember exactly but the cost of the required > 3, 4 and 5 inch sections of treaded ss pipe and elbows was not that high when > I did a replacement 10-12 years ago, I think like about $100 for all the > pieces needed to go from the manifold back, the heat blanket I used was free > to me, and I expect with this paint that you will still need to wrap the > system > > > > > ------------------------------------------------------------------------------ > > From: CnC-List [mailto:[email protected]] On Behalf Of bobmor99 . > Sent: March 1, 2014 12:47 AM > To: [email protected] > Subject: Re: Stus-List Exhaust Riser Replacement > > > > An update to my continued contrarian way... > > > > I've painted the galvanized pieces (3 coats, inside and out) with some space > age, high-temperature paint. It's used on re-entry vehicles. :-) > > > > http://www.vhtpaint.com/products/flameproof/ > > > > There's a curing process involved; > > 30 minutes @ 250F, > > 30 minute cool off, > > 30 minutes @ 450F, > > 30 minute cool off, > > and finally, > > 30 minutes @ 600F. > > > > I've completed the first two heats. My oven only goes to 550F. (Kinda like > my amp only goes to 11/2, not 12/2.) Tomorrow morning I'll turn on the > broiler, move the oven rack to the top and bake everything again for 30 > minutes. I don't want to blow up my kitchen at night. The first two bakes > stunk it up. > > > > So yes, my cheapitude has lead to new experiences. > > > > I've researched the galvanized/zinc flu warning and concluded that A4 > exhaust temperatures are below what's needed to create zinc oxide fumes. > (That's a welding/cutting thing.) Besides, in this case the zinc will be > sealed by coats of high-temp paint. > > > > So, I'm going forward with my cheapo exhaust riser replacement and will > report back at 5 year intervals. > > > > Bob M > > Ox 33-1 > > Jax, FL > > > > > > > > > > ------------------------------------------------------------------------------ > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > [email protected] > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/a1cb24e3/attachment-0001.html> > > ------------------------------ > > Message: 2 > Date: Sat, 1 Mar 2014 12:39:56 -0500 > From: Joel Aronson <[email protected]> > To: "[email protected]" <[email protected]> > Subject: Re: Stus-List Help me win a free sail! > Message-ID: > <CAEL16P9KtbkSfC_3m=HjsVyHa7m0PDu9oyPei7KcRzm7kmn=c...@mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > A Bene 36.7. > > On Saturday, March 1, 2014, Rick Brass <[email protected]> wrote: > >> So who won? >> >> >> >> *From:* CnC-List >> [mailto:[email protected]<javascript:_e(%7B%7D,'cvml','[email protected]');>] >> *On Behalf Of *Joel Aronson >> *Sent:* Wednesday, February 26, 2014 11:04 AM >> *To:* >> [email protected]<javascript:_e(%7B%7D,'cvml','[email protected]');> >> *Subject:* Re: Stus-List Help me win a free sail! >> >> >> >> Here is the FB link: >> https://www.facebook.com/photo.php?fbid=730860123615384&set=a.614489011919163.1073741826.614298161938248&type=1&theater¬if_t=photo_comment >> . >> >> >> >> (it changed since early this morning! >> >> >> >> 1 > > > -- > Joel > 301 541 8551 > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/3ee9832b/attachment-0001.html> > > ------------------------------ > > Message: 3 > Date: Sat, 1 Mar 2014 14:27:15 -0500 > From: "[email protected]" <[email protected]> > To: "[email protected]" <[email protected]> > Subject: Stus-List Help understanding composites > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > I'm but an accountant not an engineer. Help me understand this stuff.. > > So if I use a 1990 34+ as the baseline, the hull was a composite of vinyl > resin, presumably glass matt and chopped strand, balsa core and Kevlar. > > Now fast forward to 2000 and my early 121. The glass Matt has been replaced > by E glass, balsa has been replaced by core cell, glass strand remains to add > bulk and the Kevlar remains. Presumably this provides a lighter hull as the > e glass is stronger than matt, core cell is lighter than balsa and requires > less resin and the Kevlar remains the same. > > Fast forward another 10 years and we have epoxy, reinforced with carbon which > does the job of Kevlar, matt, e glass and strand. The core cell remains. > > Am I even close? > > John > > > > > ------------------------------ > > Message: 4 > Date: Sat, 1 Mar 2014 11:53:06 -0800 > From: Jim Watts <[email protected]> > To: 1 CnC List <[email protected]> > Subject: Re: Stus-List Help understanding composites > Message-ID: > <ca+jz0fcryqtvvbogtbjwcsmtsjbvdrrwbo9a3dc4frdfoma...@mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Glass mat and chopped strand are the same thing...CSM. The 34+ was probably > a layup of CSM, woven roving, and kevlar in a vinylester matrix with balsa > core. E glass is the same basis as woven roving, just a different weave. > Cloth is a lighter version of roving. The woven roving in the 34+ and the > 121 would both be e-glass, although the later boat would likely have some > biaxial or unidirectional glass in places for better engineered strength. > For more information, have a look at this...http://www.marinecomposites.com/ > > > > Jim Watts > Paradigm Shift > C&C 35 Mk III > Victoria, BC > > >> On 1 March 2014 11:27, [email protected] <[email protected]> wrote: >> >> I'm but an accountant not an engineer. Help me understand this stuff.. >> >> So if I use a 1990 34+ as the baseline, the hull was a composite of vinyl >> resin, presumably glass matt and chopped strand, balsa core and Kevlar. >> >> Now fast forward to 2000 and my early 121. The glass Matt has been >> replaced by E glass, balsa has been replaced by core cell, glass strand >> remains to add bulk and the Kevlar remains. Presumably this provides a >> lighter hull as the e glass is stronger than matt, core cell is lighter >> than balsa and requires less resin and the Kevlar remains the same. >> >> Fast forward another 10 years and we have epoxy, reinforced with carbon >> which does the job of Kevlar, matt, e glass and strand. The core cell >> remains. >> >> Am I even close? >> >> John >> >> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> http://www.cncphotoalbum.com >> [email protected] > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/4a687e8a/attachment-0001.html> > > ------------------------------ > > Message: 5 > Date: Sat, 1 Mar 2014 20:25:19 +0000 (UTC) > From: Chuck S <[email protected]> > To: [email protected] > Subject: Re: Stus-List Help understanding composites > Message-ID: > > <298256667.170663.1393705519826.javamail.r...@sz0179a.westchester.pa.mail.comcast.net> > > Content-Type: text/plain; charset="utf-8" > > You sound on track, though you should start with a solid fiberglass hull like > the 1961 Alberg 35. Surprised the spec shows only 12600# displacement. > > Checking the brochure info, the 1990 34+ used "biaxial fiberglass/kevlar > hybrid laminate with (waterproof) Hydrex isothalic NGP resin w aircraft > quality balsa core. The deck is similar adding coremat in winch areas. > > At some time "vacuum bagging" reduced the amount of excess resin in the whole > build process and that was the heaviest element. Before that, engineers were > guessing at the total weight. Now it is more exact. > > My understanding of Kevlar is that it is stronger but still flexes. A buddy > of mine made a wakeboard of Kevlar and it would flex more than fiberglass, > and he could smack it with a hammer and just bounced off. Carbon is much more > expensive, not as strong as Kevlar, but much, much, lighter and stiffer. > Early carbon would shatter and splinter when stressed. They improved the > formula somehow and re-enforce stress areas more so it is less brittle than > before. They put carbon in sails now. > > > > Chuck > Resolute > 1990 C&C 34R > Atlantic City, NJ > ----- Original Message ----- > From: [email protected] > To: [email protected] > Sent: Saturday, March 1, 2014 2:27:15 PM > Subject: Stus-List Help understanding composites > > I'm but an accountant not an engineer. Help me understand this stuff.. > > So if I use a 1990 34+ as the baseline, the hull was a composite of vinyl > resin, presumably glass matt and chopped strand, balsa core and Kevlar. > > Now fast forward to 2000 and my early 121. The glass Matt has been replaced > by E glass, balsa has been replaced by core cell, glass strand remains to add > bulk and the Kevlar remains. Presumably this provides a lighter hull as the e > glass is stronger than matt, core cell is lighter than balsa and requires > less resin and the Kevlar remains the same. > > Fast forward another 10 years and we have epoxy, reinforced with carbon which > does the job of Kevlar, matt, e glass and strand. The core cell remains. > > Am I even close? > > John > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > [email protected] > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/fd1bb68a/attachment-0001.html> > > ------------------------------ > > Message: 6 > Date: Sat, 1 Mar 2014 17:19:46 -0400 > From: "dwight" <[email protected]> > To: <[email protected]> > Subject: Re: Stus-List Exhaust Riser Replacement > Message-ID: <7B360BB51DB64F6A8FB0CC1518B11995@your4dacd0ea75> > Content-Type: text/plain; charset="us-ascii" > > In salt water it can stress crack fairly easily and then you will have salt > water spewing out all over your engine and engine space.at least that is > what happened on my 27.stainless is well worth the extra cost but it too > will eventually fail, nothing lasts forever and for whoever got 18 years out > of black pipe I say that was good luck and maybe fresh water > > > > _____ > > From: CnC-List [mailto:[email protected]] On Behalf Of Gary > Nylander > Sent: March 1, 2014 1:26 PM > To: [email protected] > Subject: Re: Stus-List Exhaust Riser Replacement > > > > Hey folks, black pipe works quite well..... > > > > Gary > > ----- Original Message ----- > > From: dwight <mailto:[email protected]> > > To: [email protected] > > Sent: Saturday, March 01, 2014 4:48 AM > > Subject: Re: Stus-List Exhaust Riser Replacement > > > > Bob > > > > I could not find out what if any surface pre treatment is required on the > metal parts before you apply this paint, only the cure process. I wonder > where it is used on re-entry vehicles having worked for years studying fire > barrier coating materials like intumescent paints; usually an "R" factor is > involved too. What did you do to the metal before applying it? > > > > What is the cost of that paint? Did you check on the cost of stainless > steel pipe and elbows? I don't remember exactly but the cost of the > required 3, 4 and 5 inch sections of treaded ss pipe and elbows was not that > high when I did a replacement 10-12 years ago, I think like about $100 for > all the pieces needed to go from the manifold back, the heat blanket I used > was free to me, and I expect with this paint that you will still need to > wrap the system > > > > > _____ > > > From: CnC-List [mailto:[email protected]] On Behalf Of bobmor99 > . > Sent: March 1, 2014 12:47 AM > To: [email protected] > Subject: Re: Stus-List Exhaust Riser Replacement > > > > An update to my continued contrarian way... > > > > I've painted the galvanized pieces (3 coats, inside and out) with some space > age, high-temperature paint. It's used on re-entry vehicles. :-) > > > > http://www.vhtpaint.com/products/flameproof/ > > > > There's a curing process involved; > > 30 minutes @ 250F, > > 30 minute cool off, > > 30 minutes @ 450F, > > 30 minute cool off, > > and finally, > > 30 minutes @ 600F. > > > > I've completed the first two heats. My oven only goes to 550F. (Kinda like > my amp only goes to 11/2, not 12/2.) Tomorrow morning I'll turn on the > broiler, move the oven rack to the top and bake everything again for 30 > minutes. I don't want to blow up my kitchen at night. The first two bakes > stunk it up. > > > > So yes, my cheapitude has lead to new experiences. > > > > I've researched the galvanized/zinc flu warning and concluded that A4 > exhaust temperatures are below what's needed to create zinc oxide fumes. > (That's a welding/cutting thing.) Besides, in this case the zinc will be > sealed by coats of high-temp paint. > > > > So, I'm going forward with my cheapo exhaust riser replacement and will > report back at 5 year intervals. > > > > Bob M > > Ox 33-1 > > Jax, FL > > > > > > > > > _____ > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > [email protected] > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/912f1567/attachment-0001.html> > > ------------------------------ > > Message: 7 > Date: Sat, 1 Mar 2014 17:29:00 -0400 > From: "dwight" <[email protected]> > To: <[email protected]> > Subject: Re: Stus-List Help understanding composites > Message-ID: <F34456AC7CDA4DECA03E0EEDF77A4DB9@your4dacd0ea75> > Content-Type: text/plain; charset="us-ascii" > > Balsa core rots when it gets wet but it is quite strong on end if > ebcapsutaed but a solid surface like a several layers of glass matt in cured > polyester or other resin...aligned E glass fibers used with knowledge of > where the stresses are highest offer more tensile strength than chopped > strand and consequently less are required so lighter weight construction can > result and have the same or better strength. Kevlar fibers have very high > tensile strength and used as Kevlar matt in a resin laminate has good > resistance to impact damage and is also very lightweight, carbon fibers are > very lightweight and have high tensile strength as well, but the best > results are achieved with proper alignment of the fibers corresponding to > the direction of highest stress > Just a guess > -----Original Message----- > From: CnC-List [mailto:[email protected]] On Behalf Of > [email protected] > Sent: March 1, 2014 3:27 PM > To: [email protected] > Subject: Stus-List Help understanding composites > > I'm but an accountant not an engineer. Help me understand this stuff.. > > So if I use a 1990 34+ as the baseline, the hull was a composite of vinyl > resin, presumably glass matt and chopped strand, balsa core and Kevlar. > > Now fast forward to 2000 and my early 121. The glass Matt has been replaced > by E glass, balsa has been replaced by core cell, glass strand remains to > add bulk and the Kevlar remains. Presumably this provides a lighter hull as > the e glass is stronger than matt, core cell is lighter than balsa and > requires less resin and the Kevlar remains the same. > > Fast forward another 10 years and we have epoxy, reinforced with carbon > which does the job of Kevlar, matt, e glass and strand. The core cell > remains. > > Am I even close? > > John > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > [email protected] > > > > > ------------------------------ > > Message: 8 > Date: Sat, 1 Mar 2014 20:16:30 -0400 > From: Graham Collins <[email protected]> > To: [email protected] > Subject: Re: Stus-List Help understanding composites > Message-ID: <[email protected]> > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" > > From hand layup, to vacuum bagging, to resin infusion and/or pre-preg. > > Graham Collins > Secret Plans > C&C 35-III #11 > >> On 2014-03-01 4:25 PM, Chuck S wrote: >> You sound on track, though you should start with a solid fiberglass >> hull like the 1961 Alberg 35. Surprised the spec shows only 12600# >> displacement. >> >> Checking the brochure info, the 1990 34+ used "biaxial >> fiberglass/kevlar hybrid laminate with (waterproof) Hydrex isothalic >> NGP resin w aircraft quality balsa core. The deck is similar adding >> coremat in winch areas. >> >> At some time "vacuum bagging" reduced the amount of excess resin in >> the whole build process and that was the heaviest element. Before >> that, engineers were guessing at the total weight. Now it is more exact. >> >> My understanding of Kevlar is that it is stronger but still flexes. A >> buddy of mine made a wakeboard of Kevlar and it would flex more than >> fiberglass, and he could smack it with a hammer and just bounced off. >> Carbon is much more expensive, not as strong as Kevlar, but much, >> much, lighter and stiffer. Early carbon would shatter and splinter >> when stressed. They improved the formula somehow and re-enforce >> stress areas more so it is less brittle than before. They put carbon >> in sails now. >> >> >> Chuck >> Resolute >> 1990 C&C 34R >> Atlantic City, NJ >> ------------------------------------------------------------------------ >> *From: *[email protected] >> *To: *[email protected] >> *Sent: *Saturday, March 1, 2014 2:27:15 PM >> *Subject: *Stus-List Help understanding composites >> >> I'm but an accountant not an engineer. Help me understand this stuff.. >> >> So if I use a 1990 34+ as the baseline, the hull was a composite of >> vinyl resin, presumably glass matt and chopped strand, balsa core and >> Kevlar. >> >> Now fast forward to 2000 and my early 121. The glass Matt has been >> replaced by E glass, balsa has been replaced by core cell, glass >> strand remains to add bulk and the Kevlar remains. Presumably this >> provides a lighter hull as the e glass is stronger than matt, core >> cell is lighter than balsa and requires less resin and the Kevlar >> remains the same. >> >> Fast forward another 10 years and we have epoxy, reinforced with >> carbon which does the job of Kevlar, matt, e glass and strand. The >> core cell remains. >> >> Am I even close? >> >> John >> >> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> http://www.cncphotoalbum.com >> [email protected] >> >> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> http://www.cncphotoalbum.com >> [email protected] > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/7d623a5a/attachment-0001.html> > > ------------------------------ > > Message: 9 > Date: Sat, 1 Mar 2014 20:20:56 -0400 > From: Ken Heaton <[email protected]> > To: cnc-list <[email protected]> > Subject: Re: Stus-List Help understanding composites > Message-ID: > <CAAbfP6Ro73GRJ4av=cbYWwRYO=gmtwejdz8gsyfgweywpu-...@mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > The schedule for the 1990 37+ > > Below the waterline the layup was one layer 1 oz. chop, one layer 1 oz. mat > and one layer of C77K/200 Kevlar Fabmat (a blend of fibreglass and kevlar > 49) outside the balsa and one layer of C72K/100 Kevlar Fabmat inside. This > Fabmat is much heavier than the 1 oz. chop and 1 oz. mat at about 2.47 oz. > for the C72K/100 and 4.94 oz. for the C77K/200. This was over 10 oz. per > sq. ft. of reinforcing material not counting the resin. > > The layup was much heavier at the turn of the bilge across the (almost) > flat bottom of the hull to the keel sump as an additional two layers of > C77/200 Kevlar Fabmat were added and further, in the keel sump, the balsa > was replaced with two layers of Compositex. This was over 20 oz. per sq. > ft. of reinforcing material not counting the resin. > > Ken H. > > >> On 1 March 2014 15:27, [email protected] <[email protected]> wrote: >> >> I'm but an accountant not an engineer. Help me understand this stuff.. >> >> So if I use a 1990 34+ as the baseline, the hull was a composite of vinyl >> resin, presumably glass matt and chopped strand, balsa core and Kevlar. >> >> Now fast forward to 2000 and my early 121. The glass Matt has been >> replaced by E glass, balsa has been replaced by core cell, glass strand >> remains to add bulk and the Kevlar remains. Presumably this provides a >> lighter hull as the e glass is stronger than matt, core cell is lighter >> than balsa and requires less resin and the Kevlar remains the same. >> >> Fast forward another 10 years and we have epoxy, reinforced with carbon >> which does the job of Kevlar, matt, e glass and strand. The core cell >> remains. >> >> Am I even close? >> >> John >> >> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> http://www.cncphotoalbum.com >> [email protected] > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/e6dd8120/attachment-0001.html> > > ------------------------------ > > Message: 10 > Date: Sat, 1 Mar 2014 20:25:37 -0400 > From: Ken Heaton <[email protected]> > To: cnc-list <[email protected]> > Subject: Re: Stus-List Help understanding composites > Message-ID: > <caabfp6r23i7wnisledmr4ibc32e2xwuu6yuccvayayobpg1...@mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Oops, make that 1.5 oz where ever I said 1 oz. > > I think the changes in materials over the years makes less of a difference > that what Graham said, "From hand layup, to vacuum bagging, to resin > infusion and/or pre-preg." Reducing the amount of resin using > these techniques results in a hull that is just as strong yet lighter. > > Ken H. > > >> On 1 March 2014 20:20, Ken Heaton <[email protected]> wrote: >> >> The schedule for the 1990 37+ >> >> Below the waterline the layup was one layer 1 oz. chop, one layer 1 oz. >> mat and one layer of C77K/200 Kevlar Fabmat (a blend of fibreglass and >> kevlar 49) outside the balsa and one layer of C72K/100 Kevlar Fabmat >> inside. This Fabmat is much heavier than the 1 oz. chop and 1 oz. mat at >> about 2.47 oz. for the C72K/100 and 4.94 oz. for the C77K/200. This was >> over 10 oz. per sq. ft. of reinforcing material not counting the resin. >> >> The layup was much heavier at the turn of the bilge across the (almost) >> flat bottom of the hull to the keel sump as an additional two layers of >> C77/200 Kevlar Fabmat were added and further, in the keel sump, the balsa >> was replaced with two layers of Compositex. This was over 20 oz. per sq. >> ft. of reinforcing material not counting the resin. >> >> Ken H. >> >> >>> On 1 March 2014 15:27, [email protected] <[email protected]> wrote: >>> >>> I'm but an accountant not an engineer. Help me understand this stuff.. >>> >>> So if I use a 1990 34+ as the baseline, the hull was a composite of vinyl >>> resin, presumably glass matt and chopped strand, balsa core and Kevlar. >>> >>> Now fast forward to 2000 and my early 121. The glass Matt has been >>> replaced by E glass, balsa has been replaced by core cell, glass strand >>> remains to add bulk and the Kevlar remains. Presumably this provides a >>> lighter hull as the e glass is stronger than matt, core cell is lighter >>> than balsa and requires less resin and the Kevlar remains the same. >>> >>> Fast forward another 10 years and we have epoxy, reinforced with carbon >>> which does the job of Kevlar, matt, e glass and strand. The core cell >>> remains. >>> >>> Am I even close? >>> >>> John >>> >>> >>> _______________________________________________ >>> This List is provided by the C&C Photo Album >>> http://www.cncphotoalbum.com >>> [email protected] > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/9b61929c/attachment-0001.html> > > ------------------------------ > > Message: 11 > Date: Sat, 1 Mar 2014 20:16:20 -0500 > From: "[email protected]" <[email protected]> > To: "[email protected]" <[email protected]> > Subject: Re: Stus-List Help understanding composites > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > Thanks - was confusing the terms mat and roving. Wish the book was still in > print - will need to find a copy. > > John > > > Sent from my iPad > >> On Mar 1, 2014, at 2:53 PM, Jim Watts <[email protected]> wrote: >> >> Glass mat and chopped strand are the same thing...CSM. The 34+ was probably >> a layup of CSM, woven roving, and kevlar in a vinylester matrix with balsa >> core. E glass is the same basis as woven roving, just a different weave. >> Cloth is a lighter version of roving. The woven roving in the 34+ and the >> 121 would both be e-glass, although the later boat would likely have some >> biaxial or unidirectional glass in places for better engineered strength. >> For more information, have a look at this...http://www.marinecomposites.com/ >> >> >> >> Jim Watts >> Paradigm Shift >> C&C 35 Mk III >> Victoria, BC >> >> >>> On 1 March 2014 11:27, [email protected] <[email protected]> wrote: >>> I'm but an accountant not an engineer. Help me understand this stuff.. >>> >>> So if I use a 1990 34+ as the baseline, the hull was a composite of vinyl >>> resin, presumably glass matt and chopped strand, balsa core and Kevlar. >>> >>> Now fast forward to 2000 and my early 121. The glass Matt has been >>> replaced by E glass, balsa has been replaced by core cell, glass strand >>> remains to add bulk and the Kevlar remains. Presumably this provides a >>> lighter hull as the e glass is stronger than matt, core cell is lighter >>> than balsa and requires less resin and the Kevlar remains the same. >>> >>> Fast forward another 10 years and we have epoxy, reinforced with carbon >>> which does the job of Kevlar, matt, e glass and strand. The core cell >>> remains. >>> >>> Am I even close? >>> >>> John >>> >>> >>> _______________________________________________ >>> This List is provided by the C&C Photo Album >>> http://www.cncphotoalbum.com >>> [email protected] >> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> http://www.cncphotoalbum.com >> [email protected] > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20140301/b4a82d30/attachment.html> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > CnC-List mailing list > [email protected] > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > ------------------------------ > > End of CnC-List Digest, Vol 98, Issue 3 > *************************************** _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected]
