Join Date: Feb 2000
Location: Annapolis, Md
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I keep seeing references to David Pascoe's articles on cored hull contruction. These article are generally based on his observations of powerboats, which experience very different loadings and are built using different core and laminate materials, as well as different methods of contruction and engineering than sailing craft. The foams that he seems to encounter are all of a low density variety, in many case open cell variety, whereas the sailing industry tends to use moderately high density closed cell foams, a completely different animal in all ways. If you read his articles carefully, you will see such items as:
"The actual failure occurred because the cored bottom panels were not properly terminated at the keel. In this instance, the major ply separations occurred within the solid laminate (containing a LOT of CSM) first."
(In other words a delamination near the keel area, such as frequently occurs on encapsulated keel sailboats, lead to hydralic pumping which then resulted in a breaking down of the non-directional fabrics within the solid laminate.)
"How About Cored Hull Sides?
No problem. Hull sides are not submerged and are far less likely to become water saturated. The potential for hydraulic erosion is far lessened even if it does. And because the sides are vertical, water will collect at the bottom near the chine. Water saturation in sides is fairly easy to detect: All you have to do is drill a small pilot hole on the inside and see if water runs out."
At least in the long term studies that I have seen, properly constructed cored hulls seem to be less of a problem than hulls that have laminates that are resin rich or which contain large amounts of non-directional fiberglass.
One other comment on the Endeavour 37, TXS-Alamo said, " The biggest gripes are slow speed, and a tendency for weather helm due to hull design." I would add to that my biggest gripes, besides poor construction techniques throughout, would be that the Endeavour 37 had one of the most uncomfortable motions (if not the most uncomfortable motion) that I have ever experienced in any boat with the possible exception of some of the older CCA boats going up wind in a chop or in a quartering sea, where you can get an extreme combination of extreme roll, yaw and pitch angles.