Hi Thomas,
Below is what I know about the layup schedule on the 34 / 37 + boats. I got
this off a forum somewhere (Not this one) a few years ago.
Topsides (total thickness 1.19")
1. Gelcoat
2. 1.5 oz. Chop
3. 1.5 oz. Mat
4. C72K/100 Kevlar Fabmat
5. 1” Balsa Core
6. C72K/100 Kevlar Fabmat
Bottom (total thickness 1.23")
1. Gelcoat
2. 1.5 oz. Chop
3. 1.5 oz. Mat
4. C77K/200 Kevlar Fabmat
5. 1” Balsa Core
6. C72K/100 Kevlar Fabmat
Tuck area at turn of bilge to keel sump two (2) additional layers of
C77K/200 Kevlar Fabmat are added to the interior layer of the bottom
schedule for a total thickness of 1.39" Keel sump has Balsa replaced by
two (2) layers of Compositex.
DuPont Aramat C72K/200 seems to have been an E-glass/Kevlar hybrid weave.
The following is all I could find out about the stuff on the web:
Composition of the glass/Kevlar hybrid, DuPont's Aramat 72K/200:
Component G/SQ.M OZ/SQ.YD Wt. % in Base Fabric Wt. %
inTotal Fabric
Glass Fiber 245.6 7.2 63
41.1
Kevlar 49 144.0 4.2 37
24.0
Mat Backing 200.0 5.9 --
33.5
Stitching Yarn 8.0 0.2 --
1.4
Total 597.6 17.5
Hydrex is a trade name for a product line from Reichhold Chemicals. The
original product was a VE/DCPD blend resin that offered the blister
resistance of VE resin, but with the tensile elongation or 2.4 which is
comparable to a good GP. The added DCPD allowed the resin to be promoted at
the manufacturer rather than the shop floor. It was a very good resin, but
not one which would have been ideal for an aramid laminate.
Hydrex 100 is a full VE resin with tensile elongation of 3.4%. Many VE
resins have an unstable gel time and need to be promoted at the shop to
insure that it does not drift out of range. Reichhold improved the
stability of the resin so that they could still promote at the manufacturer
and get stable gel times and cure rates. They now offer lower styrene
versions as well.
There is some description of the layup on the 34+ here as well:
http://www.cncphotoalbum.com/reviews/review34-36.htm
I hope this helps.
Jean-Francois Rivard
1990 34+ "Take Five"
Lake Lanier, GA
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