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: 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 The glass Matt has been replaced by E glass, balsa has been replaced by core cell, glass strand remains to add bulk and the Kevlar remains.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
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