I'd have to agree with Cam...most Keel/centerboard boats don't have much weight in the centerboard, since the primary purpose of the centerboard is to help with windward performance. If it is a lifting keel design, with a bulb keel, then it is possible that the majority of the weight is concentrated at the end of the keel, but lifting keel design boats with bulb keels aren't all that common.
IIRC, the Tide28, which a 14 year-old boy sailed across the Atlantic earlier this year is a lifting keel design with a bulb. It was modified somewhat from stock for the trans-atlantic voyage. It has 500 lbs of ballast in a bulb at the bottom of the lifting keel.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.