type of mainsail - SailNet Community
 
LinkBack Thread Tools
post #1 of 9 Old 03-29-2007 Thread Starter
Junior Member
 
Join Date: Feb 2007
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
type of mainsail

americas cup boats have their mainsails cut off at the top of the mast.
can someone please explain?
d212 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 9 Old 03-29-2007
Senior Member
 
Gary M's Avatar
 
Join Date: May 2006
Location: Sarnia ON
Posts: 693
Thanks: 3
Thanked 5 Times in 5 Posts
Rep Power: 10
 
Adds to the roach.

They are not cut off they are done like that to get more sail area. A lot of racing catamarans do that as well.

Instead of basically coming to a point at teh head like a standard main they have this extended area that is supported by some form of wire/rod, what ever. It not only gives you more area at the top but additional area in the main's roach all the way down. If the rules allow it and you can afford it, it should give you more power.

Gary
Gary M is offline  
Quote Quick Reply Share with Facebook
post #3 of 9 Old 03-29-2007
Señor Member
 
TrueBlue's Avatar
 
Join Date: Oct 2004
Location: Narragansett Bay
Posts: 4,853
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 13
     
Quote:
Originally Posted by Gary M
. . . they have this extended area that is supported by some form of wire/rod, what ever.
Isn't this "wire/rod" called a roach clip?

True Blue . . .
sold the Nauticat
TrueBlue is offline  
Quote Quick Reply Share with Facebook
post #4 of 9 Old 03-29-2007
Senior Member
 
sailortjk1's Avatar
 
Join Date: Dec 2005
Location: Porter, IN
Posts: 4,647
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 11
   
Quote:
Originally Posted by TrueBlue
Isn't this "wire/rod" called a roach clip?
Whats a roach clip? I never heard of one.
Just kidding, I grew up in the seventies.
sailortjk1 is offline  
Quote Quick Reply Share with Facebook
post #5 of 9 Old 04-01-2007
Senior Member
 
Join Date: Feb 2007
Posts: 158
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Every time the mast breaks they cut a little more off
Sabre66 is offline  
Quote Quick Reply Share with Facebook
post #6 of 9 Old 04-04-2007
Senior Member
 
Join Date: Jun 2005
Location: New Orleans
Posts: 1,996
Thanks: 8
Thanked 36 Times in 33 Posts
Rep Power: 11
 
Kinda like a high-tech gaff rig...
nolatom is offline  
Quote Quick Reply Share with Facebook
post #7 of 9 Old 04-05-2007
Senior Member
 
paulk's Avatar
 
Join Date: Jun 2000
Location: CT/ Long Island Sound
Posts: 2,603
Thanks: 4
Thanked 26 Times in 25 Posts
Rep Power: 16
 
Aerodynamic studies have shown that the squared off top of the main not only increases sail area, but also improves the airflow vortices coming off the top of the mast so as to provide more force to move the boat forwards. Airplane wings don't end in points, the way standard sails do, because of this. It can create instability in the airflow and cause the plane to stall out. (Trailing points on wings are there for other reasons.) On a boat, a pointed top is easier and cheaper to make, but it is not the optimal shape - thus the squaring off on AC boats.
paulk is offline  
Quote Quick Reply Share with Facebook
post #8 of 9 Old 04-05-2007
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
A lot of multihulls have a square top main like the AC boats do. Generally, they're only found on faster boats...

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #9 of 9 Old 04-18-2007
Senior Member
 
Join Date: May 2002
Posts: 216
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
 
the term is called

"Fat Head" or sometimes "Flat Head" Mainsails.
maestro 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
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