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Old 09-30-2008
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[quote=midlifesailor;376851]I read lots of comments about the C320 (which I think is similar in design to the 309) being faster than a C34 or even C36 but they don't have the PHRF ratings to back up the talk. I haven't checked the ratings for a 350.

Using Lake ichigan ratings.
309 PHRF 165
320 PHRF 156
34 PHRF 150
36 PHRF 141

350 not listed for Lake Michigan but Galvaston Bay at 144 (apples to bananas). GB rates 36 same as Lake Michigan ...

These are using standard models of each boat, ignioring the many variants of 34 and all the wing keels, tall mast, etc...

Mike
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Old 10-12-2008
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I got to sail on the 309 a few minutes yesterday. I've got to say it seemed to be much faster than the '84 c30 I've been sailing.
To be fair the c30 has a really dirty bottom and a blown main, so I suspect that could amount to a knot plus right there.
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Old 10-13-2008
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Point of sail matters as well. I've "beaten" 38 footers in my 33 footer in informal, 20 knots apparent races (you know, two boats going the same way, you creep closer, harden up and lay her down to get the decks wet!), and it was purely because a close-hauled 33 footer with a 15 foot J and an attentive hand on the tiller will realize its full potential more often than a 38 foot cruiser with roller furling, wheel steering and loads of gear aboard indifferently stowed (I guess at the last bit based on hobby-horsing!).

Same boats, same air on a broad reach, and I'm creamed. My main is like a child's kite thanks to 1970s design ideas.

So the variables are many: The smaller boat won't punch through the waves as well, and the motion can be more severe and tiring. The larger boat thus wins via attrition before sail technique or ratings are even factored in.

Similarly, in very light air, there are always one or two boats in a division that can keep moving while everyone else is slatting and chewing their nails. A clean bottom and super-attentive trimmers and knowing where to put your crew (and when to keep them totally still) can keep you "ghosting" to line honours when all about you are becalmed.

Don't let "the specs" guide you too closely, as they are ultimately abstractions from reality and theory forced into the same bed.
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