Scott,

sorry, but I couldn't resist the temptation, so I imported the Sailboatdata.com's sailplan and plonked one of my junkrigs on it. I ended up with a moderately tall sail with hopefully a not too tall mast (8.07m above wl.). See for yourself (batten length 3700mm).

Arne

PS: If you drop me a line, I'll mail you the .dxf file.

Anonymous wrote:

Scott wrote:

How tall can I make a tabernacle? 

The top of the tabernacle should be just below the foot of the sail, so that the sail doesn't have to pass over the extra width as it is reefed and furled.

I will try to put the "tall tabernacle" out of my mind. Thank you for the response.

Seems I am back to not knowing what to do, so I put the Fantail sail and the Weaverbird sail on top of the line drawing of the original rig. Maybe I should rig it so I can swap back and forth between the two? (A joke, of course).

I think the answer is going to be "Don't do that!" but ... Is there one of these two that will clearly work better than the other if the sail panels are cut completely flat?

Scott.

Anonymous wrote:

Scott, 

is there any strict restriction with respect to mast position and interior?

Arne

Arne,

The major constraint is due to the very large trunk for the lifting keel. Right now there is just enough room to duck and waddle around the trunk on all sides. There is currently a compression post directly under the mast. If the aft side of the mast (tabernacle) is placed any further aft than the current compression post I think it will make the meager accommodations even less comfortable. I attached a drawing showing the keel trunk and compression post locations.

I do not know what structural factors come into play with putting the mast through the cabin top instead of the fore-deck.

David,

I would really prefer to minimize the length of the mast. I would like to make it practical to trailer the boat regularly and use a tabernacle.  I have no doubt that the Weaverbird sail has all the advantages that you describe. It seems the trade off is a tall mast. I saved a copy of the Weaverbird CAD files. I will consider following this design.  Unfortunately I think it might not be trailer sailer friendly.

How tall can I make a tabernacle? Would having the hinge point 6 feet above the deck be at all possible? I am imagining the top of the tabernacle above one or two of the battens. That might allow me to lay the mast down without having an unreasonable length hanging over the stern. I have not seen anyone with a rig like this -- I imagine there might be a good reason.

Thank you,

Scott.

Arne wrote:

Scott wrote:

 I think this fan sail design is the right way for me to go.

Scott.

Scott,

The fantail sail has proven that it works. 

Yes, it works, but it's not a universal rig, to be chosen without considering the alternatives. Annie decided she didn't like it very much. I sailed with it from NZ to Alaska, and decided I didn't like it as a big boat's rig. David Thatcher is still using it, satisfactorily.

Just take care and terminate the battens flush with the leech. 

Highly desirable on all junk sails.

This will minimise the sheet tangle. Would it be an idea to lengthen the top sheeted batten? Annie should be the right one to answer on this.

Or me. Or David Thatcher. We've all used this planform. The extended top sheeted batten is also highly desirable on all junk rigs (except the double port/starboard sheeted ones, of course).

Arne

Thank you Arne and David for the feedback on the hull CLR 

It seems the following options give me fairly close to the same result:

1. 6% aft of the conventional rig for the CE

2. 9% forward of the CLR without the rudder

3. Arne's "CE placed at, or just a bit aft of the leading edge of the fin keel"

I looked at a few photos of Arcadian. That is a very nice looking boat. I would say that compared to my S2, Arcadian is more of a Ship than a boat. For now I will assume that the 17% lead required does not compare to my very different hull shape. What I have is a 22 foot dinghy with some lead ballast.

It seems I have been (poorly) re-inventing the fan sail the last few days. With a little push from Kurt Jon Ulmer I revisited the great work done by David Tyler that allows less talented people, like me, to scale his fan sail design to any sail area.

I made up my mind that 21 sq m is enough for a 2200lbs boat and placed a scaled version of Mr. Tyler's fan sail on my QCAD drawing. I am really happy with this idea. I plan on moving forward with checking out this plan to see if a sheeting arrangement can be made to work.

My apologies to Arne regarding the leach. I am sure that it is a lot easier to prevent tangled sheets if the aft part of the sail is vertical but all things considered I think this fan sail design is the right way for me to go.

Scott.