Balsa core rots when it gets wet but it is quite strong on end if ebcapsutaed but a solid surface like a several layers of glass matt in cured polyester or other resin...aligned E glass fibers used with knowledge of where the stresses are highest offer more tensile strength than chopped strand and consequently less are required so lighter weight construction can result and have the same or better strength. Kevlar fibers have very high tensile strength and used as Kevlar matt in a resin laminate has good resistance to impact damage and is also very lightweight, carbon fibers are very lightweight and have high tensile strength as well, but the best results are achieved with proper alignment of the fibers corresponding to the direction of highest stress Just a guess -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of j...@svpaws.net Sent: March 1, 2014 3:27 PM To: cnc-list@cnc-list.com 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 The glass Matt has been replaced by E glass, balsa has been replaced by core cell, glass strand remains to add bulk and the Kevlar remains.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
