'74 Irwin 28 Lost Centerboard - Page 2 - SailNet Community
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post #11 of 22 Old 05-06-2014
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Re: '74 Irwin 28 Lost Centerboard

Cchristo68 - did ctalmage take the centerboard from the Irwin 28? If not I would be interested.
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post #12 of 22 Old 05-14-2014 Thread Starter
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Re: '74 Irwin 28 Lost Centerboard

KMC - Cchristo68 never replied back to me but if he does I still need it. Thanks, ctalmage
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post #13 of 22 Old 05-14-2014
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Re: '74 Irwin 28 Lost Centerboard

Thanks ctalmage I have exactly same problem pin was in place but board gone. I mocked up a replacement, drew it up and had a company make one. They unfortunately decided to ignore my drawing entirely and supplied a board from what I believe is a Morgan 28. I sent it back so will probably end up making my own this time with a steel plate core encompassing pivot point and anchor point. I am not a big fan of the lifting arrangement on this boat the later citation 34 had a much better, safer and more reliable lifting method.
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post #14 of 22 Old 05-18-2014 Thread Starter
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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?
Thanks, ctalmage
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post #15 of 22 Old 05-18-2014
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Re: '74 Irwin 28 Lost Centerboard

ctalmage, sounds good to me. I was also worried about losing the entire board again so am going with a solid st.st.core encompassing the pivot point and the anchor point. I made a pattern out of wood first to test all the dimensions. The lanyard needs to remain centered on the delrin pull rod throughout its entire swing so the dimension from center of pivot to center of through hull tube is critical. You are welcome to the sketch I eventually arrived at which is very close to the ones posted on Irwin owners site but with critical dimensions filled in. Watch the weight! it is easy to build a 100 lb board which would be a bear to crank up not to mention the additional stress on the delrin rod the original was 60 to 70 lb.I would still advise making a pattern to check fit in your boat before any build but I'm sure you're already all over that. By the way it was Foss Foam who supplied the wrong board for $1.5k ignoring the drawing I sent them .Having said that they refunded the cost of the board and the guys were very nice to deal with.
Could you tell me what diameter your pivot pin is and how close to the bottom of the hull it is?
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post #16 of 22 Old 05-18-2014
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Re: '74 Irwin 28 Lost Centerboard

ctalmage, I just looked at my sketch in which I have an overall dimension of 1" at the thickest point (leading edge) if you make your board out of 2x 1/2" ply you would not have sufficient room to sheath the resultant board in fiberglass and have it fit in your board case. From memory my board case measures 1.3" at its narrowest point.
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post #17 of 22 Old 05-19-2014 Thread Starter
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Re: '74 Irwin 28 Lost Centerboard

KMC - thanks for the input. I didn't purchase the ply yet so will probably go with 3/8" instead. If you could pass on your sketch that would be great -- I think you can post something like that as an attachment here? As for the pivot pin dia, yes, I can get you that measurement but it won't be until the end of this week when I am able to get back to the boat - will reply back then. Thanks
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post #18 of 22 Old 05-23-2014
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Re: '74 Irwin 28 Lost Centerboard

nice to know there are other irwin 28 owners still out here do any of you know the packing size for the stuffing box for the center board? im thinking its 1/8
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post #19 of 22 Old 02-16-2015
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Re: '74 Irwin 28 Lost Centerboard

I have the opportunity to get a 28 Irwin for a steal. Like you guys mine has most of the centerboard missing. Anything you guys can pass along to me would be of great help.
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post #20 of 22 Old 02-16-2015
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Re: '74 Irwin 28 Lost Centerboard

Haha what shape is it in and just because it's a steal doesn't mean anything most steals end up costing 6-8x what you get it for lol
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