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post #3984 of Old 04-15-2013
Anders B
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Location: South Sweden
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Re: Interesting Sailboats

Thanks again, the structural reliability of the fin is part one. Part two is the design of the bulb. I think this is where much of the "ad hoc" comes in. In the IMOCA 60 class, some agreement seems to be there. However, you can find almost everything among 30-50' feet racing/cruisers available on the market today. For example the new Far East 31 bulb with chines, the J-boat L-keels with flat bottom, T-keels with maximum thickness in the same position as the maximum fin thickness, very flat, beavertail etc. And all claim that they have an optimized design. However, I have not found proofs for this (with the exception of the investigations at Chalmers, google on "Keel", "design", "Chalmers", they are available in full text).
It may be so that the performance difference between different keel/bulb designs is small compared to other factors and therefore almost everything can be accepted. And it is good to have the flat bottom of the bulb when your boat is taken out of the water?
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