Subject: Re: [harryproa] Make that Q cells
From: "Rob Denney" <>
Date: 1/29/2007, 8:29 AM

The tight corners are usually at the ends of the hull.  This area frequently has multiple layers of glass from overlaps, and does not need to be as strong or as stiff as the central part of the boat, so losing a bit of core thickness is no big deal.  The best way of getting away from tight curves at the ends is to stop the planking at a bulkhead and use polystyrene/glass ends.
Q cell/epoxy bog has better mechanical properties than any of the common boat building foams. 


The tighter the curve the  narrower the strips should be as fairing the flat faces to a round will remove material reducing the wall thickness. This is much more of a concern than using lots of bog. The bog is more likely to be stronger than the core so it isn't a strength problem. It can become a weight problem so if you were talking very tight corners, say in a tube, then it would be worth bevelling the planks. Generally I wouldn't get too concerned about the gaps though I would be wary of filling too much of a gap with polyurethane.
Mark Stephens

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