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 <paradigmat...@gmail.com> 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, j...@svpaws.net <j...@svpaws.net> 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 by E glass, balsa has been replaced by core cell, glass strand remains to 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 >> 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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