Catalina - Capri - 25s International Assocaition Logo(2006)  
Assn Members Area · Join
h.jpg Home.
a.jpg Association Forum
s.jpg Ships Store
c.jpg Cruising
r.jpg Racing
t.jpg Technical Tips
g.jpg Photo Gallery - New
o.jpg Boat Search - Updated
m.jpg Manuals & Brochures
3rdrpt.jpg Swap Meet
l.jpg Links
f.jpg Officer Flag Line & Staff
b.jpg Bylaws & Constitution
 
1.jpg Members Area
1.jpg Join the Association
 
Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
 
Association Forum
Association Forum
Home | Profile | Register | Active Topics | Forum Users | Search | FAQ
Username:
 Password:
Save Password
Forgot your Password?

 All Forums
 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 size of jibs		  New Topic  Topic Locked
 Printer Friendly
Author Previous Topic Topic Next Topic  

skrenz
Captain

Member Avatar

USA
351 Posts
Initially Posted - 02/18/2009 :  11:43:19  Show Profile
I'm sure that this has been discussed many times before but forgive a newbe.
Both of these are for a Catalina 25 jib sail.
What is the length of the foot for a 110 jib?
What is the length of the foot for a 150 jib?
Steve Krenz
`Elan
1978 SR/SK #482
Santa Fe, New Mexico
Edited by - on

pastmember
Master Marine Consultant

Members Avatar

2402 Posts
Response Posted - 02/18/2009 :  12:35:24  Show Profile
You might enjoy this site
http://dan.pfeiffer.net/boat/ratios.htm

From the site:
Size of Sails (top)
LP = Luff Perpendicular. This is a perpendicular from the luff of a sail running through the clew. This dimension is used to determine the rated percent size of a sail. The percent size of a sail is the ratio of LP/J. If the LP is 15 feet and the J is 10 feet the sail is a 150%. This does not reflect the sail size as compared to the 100% foretriangle. It does not account for luff length. Two headsails with the same LP will have the same percent size regardless of the luff lengths. One could have a luff that was half the length of the other and therefore be half the area of the other but still be the same percent size.

If the lengths of the sides of the sail are known the LP can be found from the following perimiter formula:
LP=leech*sin(2*acos(sqrt(P2*(P2-foot)/luff*leech)))
where: P2 = 1/2 perimeter = 1/2 * (luff + leech + foot)
Edited by - pastmember on 02/18/2009 12:36:57
Go to Top of Page

Dave Bristle
Master Marine Consultant

Members Avatar

Djibouti
10005 Posts
Response Posted - 02/18/2009 :  14:10:13  Show Profile
...in other words, the length of the foot depends on the cut of the sail, and therefore how high the clew is. (Cruising and roller-furling sails are higher than racing sails.) The % specification is a measure of the LP that Frank describes. Given the C-25's J of 10'6", the LP for a 110 is 11'6", and for a 150 it's 15'9". To measure that, you'll probably need to lay out the sail and use a carpenter's square (at the luff) and tape measure.
Edited by - Dave Bristle on 02/18/2009 14:11:48
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Topic Locked
 Printer Friendly
Jump To:
Association Forum © since 1999 Catalina Capri 25s International Association Go To Top Of Page
Powered By: Snitz Forums 2000 Version 3.4.06
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.