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Oscar
Master Marine Consultant

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USA
2030 Posts
Initially Posted - 04/06/2003 :  12:21:16  Show Profile  Visit Oscar's Homepage
(Thats 250 Water Ballast Center Board)

Couple of months ago there was an interesting threads on 110's 135's 155's and all that. In a most interesting dissertation Arlyn expounded on trimming the boat re. heel/drift/and rounding. He mentioned bringing CLR aft by raising the CB a bit....when? And how much is a bit, and what does that translate to in feet of line in the cockpit. ? The drift is already somewhat pronounced, at what point does raising CB affect that even more?

Oscar
<img src="http://www.woodenshoemusic.com/Images/familypics/LKforumshot.jpg" border=0>
Lady Kay 250 WB #618
In the driveway in Behtlehem, PA ready to go anytime.
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 04/06/2003 :  16:24:13  Show Profile  Visit Arlyn Stewart's Homepage
I would dive on my water ballast boat and check out the center board. At some point, Catalina following grass roots discoveries... started putting a stopper block on the center board so that at rest it assumed a raked aft posture.

So... to say that I haul mine in 8 ft after the line is slack would of course be different for a boat with the stop.

Ideally... what is wanted is boat balance that requires 3-4 degrees of rudder (tiller to windward / wheel to leeward) to maintain a windward course. So, pick a heel angle that seems comfortable and fast with the sails in trim and set the rudder on 3-4 degrees and then trim the center board so that the course is straight. Mark the center board retract line for this point. This should be about the boats optimum trim with a good lift to drag ratio for the centerboard and rudder.

Getting the boat balance in trim has the effect of not only making the weather course more efficient, but it allows more heeling forgivness in the puffs as the boat trim is not askew to one side to start with and then just goes further bad. I think this is a major problem with rounding up tendancies.

In good trim, I find the c250 center board able to handle heeling up to 40 degees. But, if the boat has bad weather helm at 10 degrees...its not going to forgive to 40, it will have rounded up before it gets there.

Arlyn C-250 W/B #224
<img src="http://www.stewartfam.net/arlyn/rr.jpg" border=0>
N/E Texas and Great Lakes

[url="http://www.cox-internet.com/arlynstewart/"]Arlyn's C250 Mods n Cruisin Stories[/url]
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Oscar
Master Marine Consultant

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USA
2030 Posts
Response Posted - 04/06/2003 :  22:03:58  Show Profile  Visit Oscar's Homepage
That sounds good. I haven't sailed in much over 15 knots, and had a reef in to start things out on the conservative side. It started rounding in the puffs, so I vented (dumped?) the main. I'll play with the CB trim next time...
Thanks.

Oscar
<img src="http://www.woodenshoemusic.com/Images/familypics/LKforumshot.jpg" border=0>
Lady Kay 250 WB #618
In the driveway in Behtlehem, PA ready to go anytime.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.