"Class jib", "working jib" - SailNet Community
 1Likes
  • 1 Post By paulk
 
LinkBack Thread Tools
post #1 of 7 Old 03-18-2014 Thread Starter
Member
 
Join Date: Sep 2013
Location: Orange Lake, FL
Posts: 97
Thanks: 8
Thanked 1 Time in 1 Post
Rep Power: 4
 
"Class jib", "working jib"

Which one refers to a "100%" jib? Or are these terms synonymous?

And while I'm at it, I often see the term "125 jib" thrown around. Isn't this a misnomer? Shouldn't that be "125 Genoa"?

Thanks for setting me straight!!
dixiedawg is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 03-18-2014
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 19,110
Thanks: 153
Thanked 536 Times in 510 Posts
Rep Power: 10
     
Re: "Class jib", "working jib"

Working jibs are usually in the 90 - 100% LP range, but it's not fixed in stone as far as I know...

You're correct in that a 125% 'jib' is technically a genoa, but the term genoa is often inferred to mean the standard 155% or 'largest headsail' you may have (at least prior to the advent of the newer 'code' sails)

Why 155%? mostly because that's the upper limit for a standard race rating before being penalized (might actually be 153 - depends on jurisdiction and rating system)

A 'class' jib would be one that's legal for a particular one-design class - many of which eschewed genoas, trying keep the class competitive while keeping costs down.

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is online now  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 03-18-2014
Senior Member
 
paulk's Avatar
 
Join Date: Jun 2000
Location: CT/ Long Island Sound
Posts: 2,845
Thanks: 4
Thanked 45 Times in 44 Posts
Rep Power: 18
 
Re: "Class jib", "working jib"

You are dealing with a wide range of different definitions here. A 100% jib fills the entire foretriangle. It may or may not be the "class jib". The class decides what the "class jib" is. It may be a 90% jib, filling 90% of the foretriangle, or it may be a 110% jib, more than filling the foretriangle. A class could have a 125% "class jib". It depends on the class. A "working jib" is another thing entirely. It would be the smallest jib that is used regularly. It would probably be a 100% jib or less; it depends on the boat and what the skipper considers his standard-use sail. Essentially, you have brought up three different ways to descriibe headsails: percentage of foretriangle, class rules, and working sails. They all overlap, so it is confusing. Seaparate them in your mind, and it should become clearer.
luck66 likes this.
paulk is online now  
Quote Quick Reply Share with Facebook
 
post #4 of 7 Old 03-19-2014
Senior Member
 
FSMike's Avatar
 
Join Date: Jan 2010
Location: Florida/Bahamas
Posts: 831
Thanks: 3
Thanked 24 Times in 24 Posts
Rep Power: 8
 
Re: "Class jib", "working jib"

A genoa is actually a genoa jib. All genoas are jibs, but not all jibs are genoas. At least that's what I was taught a long time ago.

Sail Fast Live Slow
36' Solaris Sunstar catamaran
FSMike is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 03-19-2014
no longer reading SailNet
 
Alex W's Avatar
 
Join Date: Oct 2012
Posts: 2,309
Thanks: 2
Thanked 141 Times in 134 Posts
Rep Power: 5
 
Re: "Class jib", "working jib"

A 100% jib doesn't fill 100% of the foretriangle, it just means that the clew of the jib comes back to the mast and no farther (so there is no overlap). It is common for 100% jibs to not have a full luff length and rare for them to come back to the mast along the full leech.

All of these names are just handy names and are essentially meaningless. What really matters is the size of the sail. My "working jib" is 105% and roughly 200sqft. It doesn't have a full hoist luff, the luff is 32' when up to 36 or 37' will fit on my furler. Racers would call this a #3. I could also order a "blade jib" that would be 95% and 200sqft, it would just have a longer luff and a shorter foot.

My genoa is 135% and roughly 280sqft. In racing terms this would be a #2. It does have a full length luff. 135% is a compromise size often used on furling sails, it gets closer to the performance of a 155% #1 but furls down to a 100% "working jib" for higher winds.

A #1 would be 155% and roughly 315sqft on my boat.

When evaluating headsails for my boat I compute the overlap (the percentage) as well as the sqft. One number by itself isn't that helpful, having both lets me better understand how the sail will fit.

I'm no longer participating on SailNet.
Alex W is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 03-19-2014
no longer reading SailNet
 
Alex W's Avatar
 
Join Date: Oct 2012
Posts: 2,309
Thanks: 2
Thanked 141 Times in 134 Posts
Rep Power: 5
 
Re: "Class jib", "working jib"

Sailnet member chip wrote a handy online calculator for figuring out % overlap and sail area from a few basic measurements:
Jib Overlap Calculator

As an example my working jib is 32' luff, 28' leech, 14' foot. The J on my Pearson 28-2 is 11.25'. Punching that all into his calculator I get:
Sail Area:
195.69
Luff Perpendicular:
12.23
Overlap(%):
108.72

The same sail on one of my friend's Yankee 30 would be 95%, because their J is is 12.75'.

I'm no longer participating on SailNet.
Alex W is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 03-19-2014
Senior Member
 
Join Date: Jun 2005
Location: New Orleans
Posts: 2,169
Thanks: 10
Thanked 49 Times in 46 Posts
Rep Power: 12
 
Re: "Class jib", "working jib"

Having six or seven names for almost the same thing is what makes, and keeps, sailing fun...;-)
nolatom is online now  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
"Seacock" vs. "ballcock" or "ball valve?" SEMIJim Gear & Maintenance 18 09-02-2013 05:31 PM
VIDEO: Coast Guard Academy Welcomes "Blue Goose" and "Stormy Petrel" - Patch.com NewsReader News Feeds 0 07-28-2012 07:50 AM
"Always up" jib sheet blocks- A low budget idea pedcab Gear & Maintenance 4 09-30-2009 04:50 PM
C270 Main Sail "stack Pack", Quick Cover", "lazy Bag" Install randy22556 Catalina 1 02-28-2007 11:53 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome