Join Date: Aug 2012
Location: Baltimore, MD
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Re: '74 Irwin 28 Lost Centerboard
Have you checked the irwinyachts site? Gene has posted much of the old engineering info for the Irwins there, including centerboard diagrams for several models. It may take you some time picking through the old scanned engineering docs there, but you may find gold as to how to make a brand new one.