New Mainsail - Page 2 - SailNet Community
LinkBack Thread Tools
post #11 of 11 Old 07-28-2007
Senior Member
RichH's Avatar
Join Date: Jul 2000
Location: Pennsylvania
Posts: 4,555
Thanks: 42
Thanked 259 Times in 245 Posts
Rep Power: 18

A sail used in 'light' winds usually needs to be FLAT ... so you dont develop what known as a 'separation stall' on the backside of the sail ... a stall that that will not be 'noticable' to the naked eyeball in 'light air'.

Most 'off the shelf' mainsails are cut/constructed for service 15 kts. and will be 'too full' for 'extremely light' winds. To flatten such a sail: 1. BOW the mast forward (if you can), 2. just 'raise' the sail and than add 'little' to 'zero' extra halyard tension (will tend to 'flatten' the luff section). 3. Tight outhaul. 4. bring the leech of the genoa *closer* to mainsail (if you can). 5. move the mainsheet traveller to WINDWARD and then tension the mainsheet so that the aft section of 'second batten from the top' of the mainsail is parallel to the centerline of the boat (while 'beating').
6. (most important) get some tell-tales on ALL the leeches and near the luffs ... then 'shape' and 'set' the sails so that ALL the telltales on the leeward side are 'streaming straight back' ... especially the leech tell-tales on the mainsail. Once the winds strength gets to ~8-10 then you can return to your 'normal' settings.

FLAT sails are needed in very light winds so that you dont develop a 'separation stall'. With wind with little energy such as in very light winds the airstreams will not 'follow' the shape of the sailcloth on the leeward side and will 'separate' from the sail leaving you with NO 'drive'. Tell-tales are the KEY in light wind sailing so you get the 'correct' amount of draft needed.

Last edited by RichH; 07-28-2007 at 01:05 PM.
RichH is online now  
Quote Quick Reply Share with Facebook
Sponsored Links

Quick Reply

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


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

Email Address:


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
Fine-Tuning the Autopilot, Part Two Dan Neri Gear and Maintenance Articles 0 10-13-2003 08:00 PM
Upgrading Your Mainsail System Sue & Larry Her Sailnet Articles 0 11-17-2002 07:00 PM
Basic Mainsail Trim for Racers, Part Two Pete Colby Racing Articles 0 12-02-2001 07:00 PM
Mainsail Controls for Performance Dan Dickison Gear and Maintenance Articles 0 07-04-2001 08:00 PM
Mainsail Controls for Performance Dan Dickison Racing Articles 0 07-04-2001 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