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Re: '74 Irwin 28 Lost Centerboard
KMC - Yes, looks like I'll be going the homemade route also. Foss Foam out of FL want $1k+ for a replacement - I can buy alot of marine plywood, metal plate and fiberglass for $1K. There is a rough drawing of the 28 centerboard on the Irwin Owners page but it is missing some critical dimensions needed for fabrication. I am planning on winging the dimensions that are not there and hope my creation fits.
My thought is 2 pcs 1/2" marine plywood sandwiched and glued/screwed together. Reenforced pivot point of solid delrin rod bored out for the pivot pin. At the bottom and lower leading edge I plan on routing out 1/4" on either half approx 6" x 12" and filling those voids with either st st plate or lead cast to fit. Then rounding the leading edge, feathering the trailing edge and fiberglassing over the whole assembly.
Any thoughts on my approach?