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Sat, August 08 2020, 14:40Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1234[5]678910 ]


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Date Posted: - Tuesday - 03/24/09 - 9:15pm
Author: Steve M-32 SEAN O'Sea
Subject: storm jib sizing
In reply to: Ardian 's message, "What would be the right size for a storm sail on M31 ?" on - Monday - 03/23/09 - 9:38pm

I will preface this by saying I have no offshore experience to back this up but here's what I'm seeing regarding storm jib sizing. Most charts seem to recommend 3.5% of I squared as the proper size for a shorthanded crew. As you correctly point out this gives you a size in the 40-45 sq ft range. However, I think this formula only works for "typical" boats i.e. medium displacement sloops. For instance the formula gives a Catalina 30 a storm jib of 60 sq ft and I don't think that our boats need a sail 25% smaller than a Catalina 30. Keep in mind that not only do we have THREE working sails as opposed to a sloops two our aspect ratio is also quite a bit shorter. the 72 sq ft storm jib may be quite adequate for your boat when used with a reefed mizzen. Definitely discuss it with your sailmaker and ihope someone with more experience will chime in here.

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Replies:

[> storm jib -- Kathy Campbell SHADOW M32-#3, - Wednesday - 03/25/09 - 2:59am

I'll measure my old storm jib tomorrow and see if I can figure the squire footage. I'm not the best mathematician but if all else fails I'll look up my rocket scientist for the answer. By the way, 72 sq ft is not to big but what about a reef point in the sail?


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[> [> storm jib on Shadow -- Kathy Campbell SHADOW M32-#3, - Wednesday - 03/25/09 - 2:19pm

Shadow's storm jib is 53.5 sq. ft. luff- 19.5, leech- 13.5, foot- 8'10. Does anyone have the original mariner 31/32 sail plan?


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[> [> Original Storm Jib -- Randall, - Wednesday - 03/25/09 - 5:36pm

I have a storm jib original to Murre (made in Japan, even). Looks brand new (Murre has had a gentle life before moving onto the blustery bay). I'll try to measure it this weekend. It's probably the same size as Kathy's, but should serve as a good point of reference for your purchase.


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[> [> [> thank you -- Ardian, - Friday - 03/27/09 - 7:40pm

Thank you all . It will be a great help for me .


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