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post #93 of Old 04-10-2013
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Re: Modern Hull forms and Motion Comfort

Don't know Jeff. They put encapsulated keels on Cherubini boats and they seem to hold up pretty well. Think they do the same on the Shannon centerboarders as well and they seem to have been everywhere. Looking at boats at ~$1m a pop with those 2 brands so don't think those folks would do that just to save a few bucks. Went through the scantlings in some detail on my future home. The bulb is really three pieces - the bottom of the keel in the middle filled with lead (no iron) -then two halves of lead both bolted through the bottom of the keel and glassed over and faired into the main body of the keel. The key area where it's joined to the canoe body is overbuilt and further supported by the grid system of stringers. Fairly labor intensive and not cheap. Think if a hard grounding caused hull failure with this construction a similar grounding would punch a bolted keel through the canoe body as well. ( Go to a yard and look just aft of bolted fins that done some years ago. Think they improved dramatically but unfortunately groundings can injury any vessel. If that's a concern get a Waterline). In contact with other owners who have suffered groundings (it will happen to ALL of us at some point) and they report no issues.

s/v Hippocampus
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