technique building plank Strip catamaran

Why did we use the cedar strip boat building technique to build our cruising sailboat Alacazam? For three main reasons - the superior qualities of cedar as a boat building material, the speed of construction of the cedar strip boat building technique, and the strength and lightness of a wood-epoxy hull.

building Strip catamaran plank technique

building Strip catamaran plank technique

building Strip catamaran plank technique

building Strip catamaran plank technique

I suppose if you get into biaxials and lay it on heavily enough you will eventually have a glass hull with a wood lining, and lick the problem that way, but that is hardly good engineering. By building on a female half mould all that's needed to hold the strip in place is a flat piece of metal with a slot in the long side to fit over the mould and bent so that driving it down the mould toward the plank will wedge it in place. The original Shadow was designed to be a cold-molded plywood hull. There's always a better way, and chances are someone has already done it, but they haven't reached the critical numbers that it takes to sway the naysayers - um, I mean 'conservatives'. Nowadays the use of foam as a core is commonplace and the hand lay-up method is usually combined with vacuum infusion.

What kind of strips are used?

building Strip catamaran plank technique

building Strip catamaran plank technique

building Strip catamaran plank technique

building Strip catamaran plank technique

building Strip catamaran plank technique

building Strip catamaran plank technique

In some designs , other internal items are fitted before the hull is planked - in this example, a bilge stringer has been laminated in situ on one of our 25'6" Snow Bunting designs. I must have really screwed up following Iain Oughtred's plans and scantilings. It is critical that the infeed rollers and out feed box are level and square, otherwise the board tends to want to slide out and you will end up with a skinny strip. Ever tried to fair a female mould?

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