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post #17 of Old 08-05-2013
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Re: Full or Shoal Keel on New Oyster 575?

SWAN 53 CB SM 48 48 48
SWAN 53 DK SM 30 30 30
SWAN 53 SM SD 42 42 42
Mcgregor 65 std keel -45 shoal draft -9 wing keel 15
J44 36 vs 45 for the WK
Islander Peterson 40 87 for DK 111 for the shoal draft
Gulfstar 60 48 to 57
Grand soliel 39 108 vs 120
catalina 400 117 vs 126
Bene Oceanus 473 78 vs 96

Not too many larger boats like this in phrf. If I were to look up IRC/IRS or one of the more common rating systems in Europe, I could probably find ratings for Oysters. In NQ where PHRF is king, no one else in the world uses this system too much.... hard to get comparisons. But the few I did find in larger boats, there is at least a 12-20 sec difference. Even Minne's boat is not listed, be it shoal or deep draft, as no one has raced it, or not enough have raced to get into the system to look up at this time.

One can see that there is a difference in speed. As I sorta pointed out, as did minne, if you only go 10-50 miles then hit a dock....probably not enough to make a big deal out of. If you cross oceans or equal for a 2-4 day things will change a bit!

I still say, if one needs shoal, yet wants the deep draft pointing ability, a daggerboard or CB would be the way to go. But many of those seem to be slower in ratings than a shoal is! Probably because the board does not carry a lot of the ballast, and MOST of it is in the upper keel area, so the thing is BOGGED down by a LOT more wt. Vs a deep vs shoal can be 300-500 lbs for a boat my size, to 3000-5000 lbs for boats in the 40's and 50 foot range. A bunch of added wt to get the same righting moment, then add in drift, lack of pointing........adds up, whether a person cares or not is another story.


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I drives me dinghy!
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