Sail Dimension Help - SailNet Community
 
LinkBack Thread Tools
post #1 of 7 Old 06-23-2009 Thread Starter
DrB
Senior Member
 
Join Date: Mar 2007
Location: New England
Posts: 966
Thanks: 0
Thanked 7 Times in 7 Posts
Rep Power: 9
 
Sail Dimension Help

Looking to get a new headsail for my boat. I would like to get a new "used" one that is in excellent condition, maybe a lightly used race sail, to save money over a true new one.

The issue that I ma having is trying to figure out if the dimension of the headsail from the dimensions of the rig.

The P dimension of my boat is 40.5, the I=46.0, J = 14.2, and E=11.0. So to get the max. luff dimension, along the headstay, with out measuring my current sail, I calculated Max Luff equals Square root of (I^2 + J^2) = 48.14 ft. That assumes that I tack the sail right to the deck. I am guessing that the RF tack fitting is about 12 inches off the deck, so now the Max Luff is around 47.14.

If I wanted a sail that was between 130 and 140% of the foretriangle, I am guessing that the headsail foot dimension is between 18.46 and 20.

So when looking for a sail The Luff measurement should be no more than 47.1, but best if between 47 to 46 ft, the leech no more than 46, and the foot (J) between 18.5 and 20 ft.

Are my calculations correct?

Thanks.

DrB

If you liked my advice/response, give me some rep points. If you didn't......well what do you expect, it was free.
DrB is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 06-23-2009
Member
 
Join Date: Jul 2006
Posts: 74
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
 
Go to Bacon sails
Bacon Sails & Marine Supplies

Towards the bottom of that page you can search for by boat

"Search our inventory by your boats factory specifications!!"

This will give you dimension if your boat is in their data base
Gary3675 is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 06-23-2009
Moderator
 
Jeff_H's Avatar
 
Join Date: Feb 2000
Location: Annapolis, Md
Posts: 6,849
Thanks: 5
Thanked 140 Times in 113 Posts
Rep Power: 10
     
More likely than not your dimensions bear little resemblance to what you will actually need. The calculation is not all that likely to produce an accurate forestay length off of the PHRF measurements. Boats vary quite widely from their class measurements.

But beyond that the difference between the forestay length and the luff length needs to include room for the stay connection/ swage, halyard box, some room for stretch, and clearance for the roller furler head swivel fitting.

Jeff


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay
Jeff_H is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 06-23-2009
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,521
Thanks: 104
Thanked 309 Times in 299 Posts
Rep Power: 10
     
Most sailmakers will measure your boat before building the sail - this assures the proper fit/set. Jib lead track/car locations, spreader angles/height, etc etc all combine to affect just how your sail should be built.

Having your sailmaker check out YOUR boat will result in a better sail. This is what makes me nervous about buying a sail from FX or other on-line lofts...

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 offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 06-23-2009
I don't discuss my member
 
zz4gta's Avatar
 
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,529
Thanks: 0
Thanked 31 Times in 31 Posts
Rep Power: 8
 
I agree, I ran into major problems trying to get online dimensions for a new headsail. You can measure for a new sail yourself, shoot me a PM and I'll forward you an email with what the sailmaker requires.

Merit 25 # 764 "Audrey"
zz4gta is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 06-23-2009
Senior Member
 
okawbow's Avatar
 
Join Date: Feb 2007
Location: Illinois
Posts: 240
Thanks: 2
Thanked 4 Times in 4 Posts
Rep Power: 9
 
I draw a scale line drawing of my boat, (or use one I find online.) You need to know the mast height, and distance from the mast to the head stay plate. The head stay length is also needed. The luff, leech and foot measurements of the used sail, can be compared to the scale drawing to see if it will fit. The used sail is converted to the same scale as the drawing. I've bought a couple of head sails using this method, that fit well. Draw in the position of your genoa tracks to be sure the lead angles will work.



Chuck
Privateer 26 Schooner
okawbow is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 06-23-2009
Senior Member
 
JimsCAL's Avatar
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,781
Thanks: 2
Thanked 68 Times in 63 Posts
Rep Power: 9
 
Finding a used headsail that will fit a furler is not going to be easy. If the sail luff is too long or too short you are going to have problems with the furler. With hanks you can use a sail that's not full hoist, but not on a furler. Both FX and North Sails Direct will give you quick quotes based on your boat model, but you will need to make a number of measurements before an order can be placed. I ordered a main from North when they were called Cruising Direct 7 years ago and it fit perfectly and is holding up well.

Last edited by JimsCAL; 06-23-2009 at 05:41 PM.
JimsCAL is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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
Heavy weather sailing sailorfrank Learning to Sail 26 09-10-2013 06:32 PM
Sloop, Cutter or Ketch jsgsail Boat Review and Purchase Forum 17 12-26-2008 02:47 PM
What is the point of a traveller? dwbecker Learning to Sail 9 09-25-2006 08:35 PM
Sail Care and Cleaning Kathy Barron Gear and Maintenance Articles 0 10-20-2003 08:00 PM
First Sail of the Season Bruce Caldwell Seamanship Articles 0 06-05-2003 08:00 PM

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