As I understand it, yes. The resin has strength but yields more that the reinforcement. When a load is applied to a composite, the resin stretches enough (while the reinforcement stretched less for the same load) to shift all the load onto the glass or carbon or kevlar. The resin just holds it all together.
Ken H. On 1 March 2014 21:19, j...@svpaws.net <j...@svpaws.net> wrote: > 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 replaced by E glass, balsa has been replaced by core cell, glass strand 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 > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > >
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