> I've decided to build the 18.5 Walrus. Got some questions: I've got a 21'
> fir 2x10 from which I'll get only a limited number of strips. Which
> stringers demand the most strength? Second, does anyone know price
> comparisons for canvas and the alternative coverings? Third, what are the
> sources for canvas and the alternatives? Thanks, Tom

Get the free price list from ClarkCraft ( www.clarkcraft.com) It lists their canvas, which is a heavier weight material than the #10 cotton duck I bought at the local fabric store. I'm using the lighter stuff on a 12.5 foot kayak and covering it with an elastomeric rubber: Snow Wite roof coating. I have the heavier canvas for when I build my Walrus. If the coating works on the first boat, I'll use it on the Walrus, too.

Clarkcraft also has copper tacks for attaching the canvas, and brass strips for protecting the bow.

George Dyson sells nylon and other synthetic fabrics, primarily for covering baidarkas. (Sorry, I don`t have his e-mail or mailing address, it may be on the list of links elsewhere on this bbs, or you may have to use a search engine to find more info.) You can e-mail him and ask for a price list. he also sells gallon cans of Hypalon and I think he has neoprene, too, for applying a waterproof coating to these materials.

Aircraft Spruce should have dacron fabric.

The synthetics seem to be a bit more expensive than the cotton fabrics, but a lot depends on the weight (per square yard) of the fabrics.

Locally you may be able to find a swimming pool installer who can get you the vinyl coated fabrics they use for pools (or even buy an old pool liner from someone who is replacing theirs)

Other coated fabrics that will work are those you might get from a local awning maker, or a maker of vinyl banners and signs.

At least one person has used a plastic tarp. (it is cheap but it doesn't last many years)

The strongest pieces of wood would probably need to be those on the bottom: The keel and the stringers next to it. The sides of the boat are reinforced with the trestlework. If you use a weeker material there you might beef it up with closer spacing on that trestle work.

Hope this helps

Paul G. Jacobson