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 Reefing--One Line or Two?		  New Topic  Topic Locked
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 08/01/2002 :  21:40:08  Show Profile
Derek & Duane... If we ever do get around to having a national regatta, now I know I won't bother racing in it--although I wasn't planning on it in the first place... <img src=icon_smile_cool.gif border=0 align=middle>

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette "Passage" in SW CT
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John V.
Admiral

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USA
559 Posts
Response Posted - 08/01/2002 :  22:18:35  Show Profile  Visit John V.'s Homepage
Great thread.
I use a single line reefing system on the main and a roller reef on the genoa. I like the single line very much and use it when I feel the boat is being over powered. However, and I may have missed this and appologies to anyone who has already mentioned this. there are some other sail adjustments you can make before taking what I consider larger reductions in sail area. you might first consider sail efficiency. In light wind the sail needs a lot of draft to produce the lift that pulls the boat through the water. Camber is measured by taking the line from the luff to the leech and then the perpendicular line to the deepest point of the sail at a given height, the draft. the ratio of the two measurements is the camber ratio. Moving the genoa car forward allows the jib to be more round and provide lift in a light breeze. the main drives well with the outhaul relaxed and the downhaul loose. when the wind comes up a sail with a lot of draft needs to be flattened out. So the jib car comes aft so that sheeting in the genoa flattens out since the sheet is pulling more in a line with the luff. The outhaul can be tightened and the downhaul drawn in to flatten the main. In higher wind the flatter sail is more effecient producing the right amount of lift in proportion to the latteral resistance produced by the keel.

These are the sail adjustments I make before considering putting in a reef. On the main both the outhaul and the downhaul lead to the cockpit through bulseyes and camcleats. The outhaul uses a 4/1 ration and the downhaul uses a 3/1 ratio. you need a lot of power to make the sail flat in a mounting wind. that's why I used extra blocks.

In the North Channel we often have crossings of 30 to 60 miles and can encounter a lot of different and changing winds.

John V aboard Nin Bimash II Neebish Island MI.
77 C25 sk/sr #153
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 08/02/2002 :  08:31:59  Show Profile  Visit Champipple's Homepage
Dave,

According to the way I read the rules, the main is measured luff, foot and battens only, not the leach.....

dw

Duane Wolff
"The Flying Wasp"
C-25, #401 std,sk
Chief Measurer C-25/250 National Assn.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 08/02/2002 :  11:37:12  Show Profile
That's fine, Duane... I'm all for having C-25s run down those Cals and do horizon jobs on Hunters--as long as I'm not paying for the fancy sails! Then again, after what I paid for a motor, one might question my allegiance... <img src=icon_smile_blush.gif border=0 align=middle>

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette "Passage" in SW CT
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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.