Moderator: GreenLake
TIM WEBB wrote:Would it be a useful exercise to remove your CB and make a side by side (or stacked?) comparison to a known/stock DS CB? I realize that if there are no DS's nearby it would be an expensive proposition to get a DS CB to compare to, but it might save you a lot of unnecessary headaches and wasted effort?
Alan wrote:https://www.drmarine.com/proddetail.asp?prod=DS106
Is the centerboard Rudy mentioned the one in the link above? Class-legal Daysailer centerboards are supposed to be no heavier than 25 pounds, if memory serves. My DSII will never be a competitive racer and it'll sure as heck never be lightweight, so a 55-pound centerboard could be tempting.
TIM WEBB wrote:This may or may not be an obvious question, but is it possible that the CB is simply installed the wrong way? If you have room at the top, and it protrudes at the bottom, could you simply flip it around? Or fill the existing pivot hole and put a new one where it needs to be to have the board fit the trunk correctly?
GreenLake wrote:Excellent point. Usually, a straight edge is a the rear of a board (and should be up, when retracted).
The difference of quoted 55lbs to 25lbs might be a slip, or, if real, it' just going to be good - you don't need to follow class rules if your hull isn't a true DS (as we suspect, but can't prove) and an extra 30 lbs might just well make the boat a bit nicer to handle when it starts to heel.
TIM WEBB wrote:I'm curious about what appears to be a "notch" in the trailing edge (?) of that CB? Seems to me that would weaken it substantially?
GreenLake wrote:Been wondering the same.
GreenLake wrote:I think the most important thing would be to make sure there's a remnant of a reasonable foil shape, not just some flat half-profile like this: \____/
By thinning the board, you've also reduced its strength a bit; more than you realize perhaps. Maybe you should hold off increasing the area.
I'm still concerned why a reasonable foil shape didn't fit your trunk opening, but that's not something we can diagnose remotely and you are done.
Incidentally, the same things with grinding a shallow channel and embedding several layers of unidirectional roving applies to the CB as well, should you be concerned with strength.
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