SailNet Community - View Single Post - Fibreglass Deck Build
View Single Post
  #12  
Old 11-18-2010
RichH's Avatar
RichH RichH is offline
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,581
Thanks: 9
Thanked 40 Times in 36 Posts
Rep Power: 14
RichH will become famous soon enough
Quote:
Originally Posted by poopdeckpappy View Post
This is not entirely correct, it doesn't have any load bearing value but it's not for cosmetic purposes; CSM will give you thickness and stiffness but it's the cloth ( E,S or biaxial ) that will give it strength and is the last layer ( excluding the gelcoat ) in the finish product, that is why they use 4 or 6oz cloth on surfboards, strength and appearence

"Thickness" increases the structural moment of Inertia about the neutral axis, matt requires a relatively resin-rich structure and on a cost ratio basis becomes the most expensive way to 'gain such thickness'. The prime purpose of matting to provide a 'cushion' under gelcoat to prevent 'print-through' of the roving/cloth during the very long term 'post-cure' phase of the polymerization. Stiffness is due to the fiberstress along the outtermost 'skin' of a structure, matting does not have the structural capacity to do this, its a 'cosmetic filler' and not much more.
Reply With Quote Share with Facebook