type of mainsail - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > Out There > Racing
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #1  
Old 03-29-2007
Junior Member
 
Join Date: Feb 2007
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
d212 is on a distinguished road
type of mainsail

americas cup boats have their mainsails cut off at the top of the mast.
can someone please explain?
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 03-29-2007
Gary M's Avatar
Senior Member
 
Join Date: May 2006
Location: Sarnia ON
Posts: 675
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 9
Gary M is on a distinguished road
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
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 03-29-2007
TrueBlue's Avatar
Señor Member
 
Join Date: Oct 2004
Location: Narragansett Bay
Posts: 4,853
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 13
TrueBlue is a jewel in the rough TrueBlue is a jewel in the rough TrueBlue is a jewel in the rough
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
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 03-29-2007
sailortjk1's Avatar
Senior Member
 
Join Date: Dec 2005
Location: Porter, IN
Posts: 4,647
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 10
sailortjk1 has a spectacular aura about sailortjk1 has a spectacular aura about
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.
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 04-01-2007
Senior Member
 
Join Date: Feb 2007
Posts: 158
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
Sabre66 is on a distinguished road
Every time the mast breaks they cut a little more off
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 04-04-2007
Senior Member
 
Join Date: Jun 2005
Location: New Orleans
Posts: 1,914
Thanks: 7
Thanked 30 Times in 27 Posts
Rep Power: 10
nolatom will become famous soon enough
Kinda like a high-tech gaff rig...
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 04-05-2007
paulk's Avatar
Senior Member
 
Join Date: Jun 2000
Location: CT/ Long Island Sound
Posts: 2,554
Thanks: 4
Thanked 23 Times in 22 Posts
Rep Power: 15
paulk is on a distinguished road
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.
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 04-05-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
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.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 04-18-2007
Senior Member
 
Join Date: May 2002
Posts: 216
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
maestro is on a distinguished road
the term is called

"Fat Head" or sometimes "Flat Head" Mainsails.
Reply With Quote Quick reply to this message 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:

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

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


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 09:00 PM
Upgrading Your Mainsail System Sue & Larry Her Sailnet Articles 0 11-17-2002 08:00 PM
Basic Mainsail Trim for Racers, Part Two Pete Colby Racing Articles 0 12-02-2001 08:00 PM
Mainsail Controls for Performance Dan Dickison Gear and Maintenance Articles 0 07-04-2001 09:00 PM
Mainsail Controls for Performance Dan Dickison Racing Articles 0 07-04-2001 09:00 PM


All times are GMT -4. The time now is 03:32 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.