Trimming jib down wind - SailNet Community
 
LinkBack Thread Tools
post #1 of 4 Old 08-16-2011 Thread Starter
Senior Member
 
Slayer's Avatar
 
Join Date: Jul 2006
Location: North Andover, MA
Posts: 628
Thanks: 15
Thanked 11 Times in 11 Posts
Rep Power: 9
 
Trimming jib down wind

At what point of sail do you stop relying on telltales to trim the jib and rely on sail shape. I have read that on a down wind course the wind is pushing the sail rather than "lifting" it, and the tell tales are not a good indication of trim. Does this apply only when on a run, or also a broad reach? Or is it different with each boat?
Slayer is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 4 Old 08-16-2011
Senior Member
 
Join Date: May 2002
Posts: 2,680
Thanks: 6
Thanked 31 Times in 29 Posts
Rep Power: 14
 
When the wind is no longer creating a laminar flow over the surface of the sails, aerodynamics is irrelevant, and the telltales are no longer helpful.

I have occasionally been able to keep the aerodynamic flow going until the boat was on a very broad reach, but the telltales stop working somewhere between a very broad reach and a run.

Also, in light air, there is a point when the wind is so light that it can no longer lift the weight of the telltales. At that time, the telltales become useless, and you have to resort to some other method of trimming the sails. Usually the best way is to ease the sail until it begins to lift at the leading edge (the luff), and then trim it back in a skosh, until it lays down.

Last edited by Sailormon6; 08-16-2011 at 11:43 AM.
Sailormon6 is offline  
Quote Quick Reply Share with Facebook
post #3 of 4 Old 08-16-2011
ASA and PSIA Instructor
 
Join Date: Apr 2000
Posts: 3,557
Thanks: 7
Thanked 24 Times in 24 Posts
Rep Power: 16
 
Quote:
Originally Posted by Slayer View Post
At what point of sail do you stop relying on telltales to trim the jib and rely on sail shape. I have read that on a down wind course the wind is pushing the sail rather than "lifting" it, and the tell tales are not a good indication of trim. Does this apply only when on a run, or also a broad reach? Or is it different with each boat?
my experience is that lift disappears in the transition from a beam to a broad reach, as you can no longer ease the sails to maintain the necessary air flow. The telltales tell you that fact...

Certified...in several regards...
sailingfool is online now  
Quote Quick Reply Share with Facebook
post #4 of 4 Old 08-18-2011
Senior Member
 
Join Date: Jun 2005
Location: New Orleans
Posts: 1,996
Thanks: 8
Thanked 36 Times in 33 Posts
Rep Power: 11
 
Also, at some point on a deep broad reach, the jib becomes blanketed by the main to the extent that it's not doing too much anyway. The concept of 'perfect' jib trim at that point is more theoretical than real. That's why we have spinnakers, or head up a little to where the jib draws better.
nolatom 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
Genoa trimming..... bettyswollocks Gear & Maintenance 5 06-13-2008 09:01 PM
Trimming a trysail. Lancer28 Learning to Sail 2 11-02-2007 04:05 PM
Trimming the main Hyperion Learning to Sail 7 07-09-2007 03:31 PM
Headsail Trimming Basics Rich Bowen Racing Articles 0 05-27-2002 08:00 PM
Mainsail Trimming Dan Dickison Learning to Sail Articles 0 04-12-2001 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