A production 30' multihull might well easily hit 21 knots...especially surfing... but I just don't see how a 30' keelboat could do that...without being dangerously out of control. Once you start pushing past hull speed on most boats, the control of the boat starts to deteriorate pretty badly. Doing 21 knots on a 30' multihull would be pushing it pretty hard in any case. Even Gui's 42' racing boat is hard pressed to do 20 knots I'd imagine, and I know he regularly sails her at 12-14 knots.
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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.