So vacuum bagging essentially draws the resin into the substrate as opposed to just letting it sink in? I could see how that would be more precise and require less resin. On that note, resin adds minimal strength but bonds ?
All questions. John Sent from my iPad > On Mar 1, 2014, at 3:25 PM, Chuck S <cscheaf...@comcast.net> 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: j...@svpaws.net > To: cnc-list@cnc-list.com > 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 by E glass, balsa has been replaced by core cell, glass strand remains to add 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 > CnC-List@cnc-list.com > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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