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From: Bryan Genez (no email)
Date: Thu Jul 03 2003 - 08:19:37 EDT
wrote:
>> deck delamination (take care of these 3 in survey)
>
> Especially if balsa or plywood has been used as a deck core material.
> EVERY penetration must be properly sealed or rot is sure to happen.
Core rot is only one cause of delamination. More often, the problem is in
the layups themselves. In these, the core material is irrelevant.
As an example, I've seen several examples of Airex-cored hulls with
substantial delamination problems. Airex also has a wonderful
characteristic of changing shape under heat; you can literally see waves
develop in an Airex-cored boat that's in the summer sun.
>
> Something that the low cost production builder sometimes omit.
...as do some high-cost semi-custom builders.
FWIW, earlier this year, I removed virtually every piece of hardware from
the coach roof of my 26-year-old, balsa-cored, production boat. None of the
penetrations had been sealed. None leaked. No rot. I don't disagree that
the holes should be sealed, and I sealed every new hole that I drilled. But
I do question the "sure to happen" statement. Let's just say the odds of
destructive leaking increase unless the core is sealed.
>
>> greater catastrophic damage potential upon hard grounding, hitting
>> reefs,
>> rocks, or floating containers
>
> Maybe, depends on the laminate.
>
> A sandwich cored hull using Airex solves this problem.
Not necessarily. Fiberglass is notoriously low in abrasion resistance. Put
a fiberglass boat on the rocks or in coral with the sea action adding a bit
of motion and it will get chewed up in short order. The sandwich core will
absorb some energy from impacts...for example, the oft-repeated collision
with shipping containers...but it will do little to nothing to limit damage
from a hard grounding, unless the boat is refloated quickly.
-- Best, Bryan (KB3HMZ) "Capella" Valiant 40 #158 Annapolis, MD ------------------------ Yahoo! Groups Sponsor ---------------------~--> Get A Free Psychic Reading! Your Online Answer To Life's Important Questions. http://us.click.yahoo.com/Lj3uPC/Me7FAA/ySSFAA/A1TolB/TM ---------------------------------------------------------------------~-> To unsubscribe from this group, send an email to: Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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