The schedule for the 1990 37+ Below the waterline the layup was one layer 1 oz. chop, one layer 1 oz. mat and one layer of C77K/200 Kevlar Fabmat (a blend of fibreglass and kevlar 49) outside the balsa and one layer of C72K/100 Kevlar Fabmat inside. This Fabmat is much heavier than the 1 oz. chop and 1 oz. mat at about 2.47 oz. for the C72K/100 and 4.94 oz. for the C77K/200. This was over 10 oz. per sq. ft. of reinforcing material not counting the resin.
The layup was much heavier at the turn of the bilge across the (almost) flat bottom of the hull to the keel sump as an additional two layers of C77/200 Kevlar Fabmat were added and further, in the keel sump, the balsa was replaced with two layers of Compositex. This was over 20 oz. per sq. ft. of reinforcing material not counting the resin. Ken H. On 1 March 2014 15:27, 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 replaced by E glass, balsa has been replaced by core cell, glass strand 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
