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Subject: Re: [worldcruising] Building material question...
From: R C (nassaw@XXX.XXX)
Date: Fri Dec 29 2000 - 12:26:00 EST
Chuck,
Building in foam core has been around for better than 20 years. I believe Kelsall was the first to come up with foam
core sandwich.
At first the core was very expensive and was only produced by a few companies. This only allowed racing teams with
large sponsorships the price tag of this technology. Airex being the most popular in the beginning. Other companies have
been producing their version of foam core and competition has driven the price down so the home builder could afford to
use.
The foam is not a styro or urethane. Its a PVC foam. 4 major manufactures producing this foam 2 being linear (Airex &
Corecell) and 2 being cross linked (Divneycell & Kleggcell) I can explain this if your interested in a direct mail.
The foam is a PVC chemical construction unlike balsa or wood cores will never absorb water. This make the material
ideal for boat cores.
The structural integrity would not be the core alone but locked between 2 layers of grp would create the sandwich. I
thought I saw someone mention the thickness would take away from living space.
A 40' hull would use 1/2" foam core locked between 2 layers each side of 17 oz. sq. yd. Uni or Bi directional glass.
Decks are 3/4" and coaming or salon top is 1".
This makes for a very lightweight boat and is normally used in Multi's where ballast is not required and weight is the
issue.
I'll post my site below where we are building a Suncat MKII using the KSS method.
http://www.geocities.com/TheTropics/Shores/1748/
If you have any questions. You can e mail us direct
Regards
Bob Crepeau
Chuck Morford wrote:
> I was looking around the YachtWorld "Boats for Sale" site and ran across this:
>
> http://yachtworld.com/boats/view_result.cgi.en?boat_id=44488&units=Feet¤cy=USD&listing_id=1930&page=&mls_true=
>
> It's a custom Trimaran, built with epoxy and foam core....
>
> Is this good, bad, or neither?
>
> I would suspect that a foam core would mean less weight, but what about
> structural integrity?
>
> Anybody got any experience with this type of construction?
>
> Chuck
>
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