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Swedish mainsail

Printed From: Sailrite Enterprises, Inc.
Category: Sailmaking
Forum Name: Sail Design
Forum Discription: Sail shape, two dimensional and three dimensional
URL: http://forum.sailrite.com/forum_posts.asp?TID=3024
Printed Date: 18 January 2020 at 8:46pm


Topic: Swedish mainsail
Posted By: lumeij
Subject: Swedish mainsail
Date Posted: 02 September 2014 at 6:49am
In the Saillrite book on stormsail construction it is stated that a yacht with a Swedish mainsail consistently points higher then with a reefed mainsail. It is stated that despite the area being only about 50%, the most effective part is not affected. Would it be possible to get a more detailed explanation for this statement. I don't seem to be able to figure out why a Swedish mainsail would be more effective than a reefed mainsail with the same area, other than the fact that a Swedish mainsail doesn't have the bulk of the reefed mainsail hanging from or tied to the boom.

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J.T. Lumeij



Replies:
Posted By: MattGrant
Date Posted: 02 September 2014 at 7:34am
The tied bulk is the exact reason that the swedish main is more efficient. I suggest that you read "Sail Performance" by C.A. Marchaj for a complete understanding of why less lift is generated at the narrow top of a sail when compared to the wider foot section. If you disturb airflow at the foot of the sail you are hampering the effectiveness of that portion of the sail.

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Best Regards,
Matt Grant
Sailrite


Posted By: anee
Date Posted: 14 February 2018 at 9:28am
Swedish main is totally more efficient! I aggree for 100%







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