Got it - thanks John
Sent from my iPad > On Mar 1, 2014, at 8:54 PM, Graham Collins <cnclistforw...@hotmail.com> wrote: > > Vacuum bagging clamps everything and draws out air bubbles, gives a more > consistent result with less resin. Resin infusion is vacuum bagging on > steroids, you pull a vacuum and you inject resin at pre-set points, the resin > is drawn in with great control - so even less material, better results. > Vacuum bagging can be done by an amateur, I have done it a few times, whereas > resin infusion is the domain of the pro. > > Ideally you want enough resin to bond the layers together but just that > amount. > Graham Collins > Secret Plans > C&C 35-III #11 > On 2014-03-01 9:19 PM, 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 > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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