Summer Breeze Sail/Dagger board placement

by Kevin
(Az)

I am preparing to build a David Beede "Summer Breeze", I intend to make two changes.

First is to place a single sail, Sloop, perhaps using the originals Lugs mast location.

Second is to install a Dagger board box instead of using a LeeBoard.

My Question: Can I place a Sloop type rig in place of the lug in the original mast position?

If not where?

And second: After determining the placement of the Sloop rig where should I place the Dagger Board?

I assume that one affects the other.

Thx in advance,

Kevin

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Sail Plan
by: Mike

I am not a naval architect, there are formulas for working out C of E and LR but they can be complicated as there are so many variables.

My gut instinct is to go for trial and error.

The position of the centerboard and mast position need to be established first as they will need major structural changes if you wanted to alter them.

The sail plan can more easily be changed by using cheap poly tarp or shower curtain material as trial sails.

I would put the centerboard roughly in line with the position of the lee boards.

Then to find the centre of lateral resistance of the hull, put her in the water and find the point where if you push her sideways she doesn’t turn in either direction.

The centre of effort of the sail plan wants to be slightly in front of this.

A rough rule of thumb for mast height for a Bermudan rig is 25% longer than the hull length.

The mast may need to move back depending on the size of headsail wanted.

You might find some of the information here useful gmatkin/therules.htm.

Personally, I would leave the mast as in the plans but rig her with a balanced lug, it will give you more sail area without the complications of the bermudan rig.

Thanks
by: Kevin

Those are great pics.... gonna help me a bunch! Thanks!
Kevin

Summer Breeze
by: Michael

Here are some photos you might find interesting  https://www.flickr.com/photos/23438966@N07/albums/72157603844285468/


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