Jump to content

Sign in to follow this  
dfitchtx

Spindrift 10

Recommended Posts

Does anyone have experience converting this boat to a Balanced Lug? It is, of course designed for a Cat rig. I am told by some designers that with boats of this size, the relationship between CE and CLR is more art than science.

Share this post


Link to post
Share on other sites

Hi, 

I just redesigned a Marconi rig to a Balanced lug for the sharpie I just completed.  Rather than starting to figure out the relationship between CE and CLR for the boat and changing it,  I drew up a balanced lug with  the same CE (in the vertical location)  as the original sail.  Here are my suggestions based on what I did, and it did result in a balanced sail plan that sails quite well.

 

1. On a scaled drawing draw the mast and the triangular sail.  I suggest you use 2 inches to the foot for your 10' Spindrift so small errors in drawing and measurements won't cause problems. I used the standard scale of 1" to the ft because my boat was 21ft.  

2. Then draw a line perpendicular to the mast roughly where the hull starts (or even better draw the entire hull to scale).  

3. Find the CE of the original sail draw a vertical line down to the "hull."  This is your starting diagram. 

4. Now you can try out different sail patterns for the balanced lug.  Calculate the CE for each design and place it (or draw it) on your starting diagram.  The goal is to make sure the CE of the balanced lug lines up anywhere on the vertical line or the original CE of the triangular sail. 

 

5. You should also use the scaled drawings to calculate sail area.  The total area of the balanced lug should be about the same as the area of the triangular sail, unless you consciously decide to make it bigger or smaller (bigger means more powerful and maybe difficult to sail, and smaller means you won't be sailing as fast)

 

If you don't know how to calculate the CE of a sail, most books on sailmaking describe how to do this.  Your local library should have some of the standard books on this.  I used The Sailmaker's Apprentice by Emiliano Marino. 

 

Finally, I suspect you will probably be making your own sails.  If so, I suggest you start with the much less expensive Polytarp sails.  This will let you experiment with different designs at a minimal cost.  If the first one doesn't work out you won't feel like you have wasted a lot of $$ on a dacron sail. 

 

Tom 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  


Supporting Members

Supporting Members can create Clubs, photo Galleries, don't see ads and make messing-about.com possible! Become a Supporting Member - only $12 for the next year. Pay by PayPal or credit card.




×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.