Centre board for catamaran


Centre board for catamaran
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cookmijo
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cookmijo
posted 6 Years Ago HOT
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Hi, I have a beach catamaran (Hobie 18) that has a centre board for each hull. They are very old and heavy and I would like to make carbon replacements. The foil is about 1.4m in length, the foil chord is about 40cm and the foil thickness is about 40mm at the thickest point. How would you recommend I approach this? Do I make a mould, make 2 halves and glue them together? Any thoughts please. Thanks in advance. Mike
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cookmijo
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cookmijo
posted 6 Years Ago HOT
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Warren (Staff) - 8/22/2019 4:15:13 PM
You make the moulds in one shot. Make one half, let it cure, release agent the flange, make the other.  They will line up perfectly then.  You can even make registration dots on the flange so it aligns perfectly every time.  Then you can bolt the 2 halves together when the time comes. 

Hi Warren, got it thank you. Before I get going on the moulds, the centre board has some scratches on it, how would you suggest I deal with these to get the surfaces as perfect as possible? Some sort of filler/gel coat and sand down? Thanks again for your advice. Mike
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Centre board for catamaran
cookmijo - 6 Years Ago
     2 moulds is fine - plenty are made that way. A lot also use a foam core with the carbon wrapped around the foam core and the surface resin coated and sealed to give a good finish. So it is down to...
Warren (Staff) - 6 Years Ago
             Hi Warren, thank you for the advice. The issue that I have with a foam core is accuracy, ie getting the core to the right size and shape to take the carbon wrap and end up with an exact copy. Is ther...
cookmijo - 6 Years Ago
                 And I would probably have to vacuum bag the 2 moulds...would you recommend that as well? Mike
cookmijo - 6 Years Ago
     You make the moulds in one shot. Make one half, let it cure, release agent the flange, make the other. They will line up perfectly then. You can even make registration dots on the flange so it aligns...
Warren (Staff) - 6 Years Ago
             Hi Warren, got it thank you. Before I get going on the moulds, the centre board has some scratches on it, how would you suggest I deal with these to get the surfaces as perfect as possible? Some sort...
cookmijo - 6 Years Ago
     Depends how bad they are. Sand flat then polish back may be all thats needed. But yes definitely worth repairing as the better quality the pattern, the better the mould so less work later on.
Warren (Staff) - 6 Years Ago

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