Join Date: Jan 2012
Location: British Columbia
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Re: Pros and cons of steel sailboats
With a steel hull, any hot pipes running thru it (exhaust, stove pipe, etc)should have stainless plate, set in flush, for the first two or three inches around it. Even with a wet exhaust, you still see rust around the exhaust pipe, due to slightly elevated temperatures around it. Every ten degrees rise in temperature increases the corrosion rate considerably.
With a 1 1/2 inch sch 40 exhaust running thru the transom, I like to weld a 2 1/2 inch length of 4 inch SS tube centred around where it runs thru, to make a good place to end the insulation. A similar piece of tube around the stove pipe makes a good way to finish the panelling. Sometimes you can find an SS angle flange, for an excellent finish to the panelling.
Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"