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Twin wiring downwind

Printed From: Yachts and Yachting Online
Category: Multihulls
Forum Name: Dinghy multihulls
Forum Discription: For those who prefer two (or more) hulls to one!
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=12467
Printed Date: 17 Oct 17 at 9:44pm
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com


Topic: Twin wiring downwind
Posted By: dohertpk
Subject: Twin wiring downwind
Date Posted: 01 Aug 16 at 11:24am
Quick question, why don't crews twin wire downwind on cats? 



Replies:
Posted By: Rupert
Date Posted: 01 Aug 16 at 5:11pm
Angles too high? Wild thing quicker?

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Firefly 2324, Lightning 130, Puffin 229, Leader, Topper 44496, yellow Minisail


Posted By: craiggo
Date Posted: 01 Aug 16 at 11:42pm
It's all to do with the drag curve for a given hull shape and the power available from the rig.
For any combination there is a sweet spot in terms of angle that gives best vmg.

On many catamarans due to the canoe body low drag with one hull immersed, the best angles are achieved when you can just keep the windward hull clear of the water. The actual angle at which best vmg is achieved is at a lower power angle than if you had both crew on the wire.
Certain classes (A-class) have now developed to a point where most new designs now operate at a better VMG with the helm on the wire rather than wild-thinging.


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Graduate 2928
OK 2071


Posted By: H4marine
Date Posted: 01 Sep 16 at 5:15pm
We had better downwind vmg soaking it low with flattish boat than boats getting a hull out, when breeze increases it's more about getting weight right back off the corner so more about hanging off the back than the side. Or that's how it feels to me.

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sailonline.org sailport.se



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