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Makes me wonder how good people's hearing is. Sometimes daggerboards can definitely make noises. If you're sitting in light air powerboat slop, they can rattle in their slots. The WHACK of the sails and boom slatting back and forth might cover this noise, or make it seem inconsequential. Often you can slip something in next to them (like the end of a line, or a sponge) to keep this from being too bothersome. Another noise could be a high-speed harmonic vibration - humming - that one or the other or both boards could start doing if you are going fast enough. This occurs frequently on Lasers, for example. (Not a catamaran, but the same idea applies.) The humming can be stopped by lifting the board(s) or by slowing down. (But who wants to do that??)
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