Quote:
Originally Posted by Orwell boy
please may i ask for more info what you mean and why ? thanks your opinion is very valued
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A fiberglass mold is made of the stringer system. Then, the stringer can be easily replicated out of fiberglass. As long as the correct trimming is done and the laminate schedule is followed, the stringer system is the same every time.
This is easiest to accomplish with a passive stringer, since then, they require no coring.
Active stringers require a core of some sort. You could foam in molded stringer after bonding to the hull, but it's added labor which adds money. Many US boatbuilders do this.
For the builder I work for, rather than glassing the molded stringer in, we assemble it with an elastic-type bonding putty (lots of elongation before failure). That way, even if the boat encounters SERIOUS stresses, the gelcoat may crack due to overelongation, but the hull/deck/stringer bonding will never be affected.
We also limit our use of cores. Where we do use cores, they are all synthetic, and we default to "heavy duty". Coosa 26 lb for transoms/consoles, Lantor Coremat for seats/consoles, and divinylcell for decks. Hulls are solid glass with a buildup of technical fabrics, usually stitched mats. We also default to NPG/ISO gelcoats, and ISO/DCPD resins for all processes. We're experimenting with VE blends for various other processes. World class boatbuilding at its finest.
