Main trim - depowering - 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 > Skills and Seamanship > Seamanship & Navigation
 Not a Member? 

Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


Reply
 
LinkBack Thread Tools
  #1  
Old 12-12-2008
Senior Member
 
Join Date: Mar 2004
Location: Chicago area
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
imiloa is on a distinguished road
Main trim - depowering

Normally when depowering the main after having tightened the outhaul, cunningham, and backstay (fractional rig), I let the traveller down (change the angle of attack). If I need to depower more I'll let out the main sheet (which further changes the angle of attack and also adds twist to the main). Of course now the boom has moved substantially to leeward. My question for this group is do you ever have a situation where you let the main sheet out but pull the traveller car up to windward to keep the boom as close to the center line of the boat as you can? My understanding is that doing that essentially twists out the upper portion of the sail (which is where the high wind speeds are) while keeping the bottom portion of the sail "powered up". I guess the theory is that in doing this you don't change the entire angle of attack of the sail as much as you would by letting the traveller down before easing the main sheet. Anyway, does anyone do this and when and why? Also, are you paying attention to the telltales while this is going on? Inquiring minds want to know.
Reply With Quote Share with Facebook
  #2  
Old 12-12-2008
Senior Member
 
Join Date: Jun 2005
Location: New Orleans
Posts: 1,886
Thanks: 7
Thanked 26 Times in 23 Posts
Rep Power: 10
nolatom will become famous soon enough
If I've already tightened the luff and the foot, but still overpowered, then I let the traveler off. If still overpowered, then it's time to reef. I wouldn't bring the traveler back in, you'll just have the bottom half overtrimmed, top half luffing all the time and shredding your sailcloth.
Reply With Quote Share with Facebook
  #3  
Old 12-12-2008
.
 
Join Date: Nov 2006
Posts: 10,851
Thanks: 0
Thanked 4 Times in 2 Posts
Rep Power: 12
Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice
Go here CLICK..and watch the videos on traveler etc..
all your questions will be answered

I know the idiot that made those
Reply With Quote Share with Facebook
  #4  
Old 12-12-2008
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,931
Thanks: 75
Thanked 214 Times in 206 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Quote:
Originally Posted by imiloa View Post
......If I need to depower more I'll let out the main sheet (which further changes the angle of attack and also adds twist to the main)....
Once you get to this point, it's helpful to have a powerful vang... from this point on with the vang on hard you can continue to reduce the angle of attack by easing the mainsheet... the vang prevents boom lift and subsequent change in "trim".
__________________
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)
Reply With Quote Share with Facebook
  #5  
Old 12-12-2008
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,923
Thanks: 27
Thanked 52 Times in 49 Posts
Rep Power: 6
jackdale will become famous soon enough
Quote:
Originally Posted by nolatom View Post
If I've already tightened the luff and the foot, but still overpowered, then I let the traveler off. If still overpowered, then it's time to reef. I wouldn't bring the traveler back in, you'll just have the bottom half overtrimmed, top half luffing all the time and shredding your sailcloth.
If you ever ask yourself, "Should I reef?", the answer is yes. A good reefing set up should also flatten your main.

Jack
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Share with Facebook
  #6  
Old 12-12-2008
Senior Member
 
Join Date: May 2007
Posts: 547
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 8
SteveInMD is on a distinguished road
I agree. People usually wait too long to reef. An overpowered boat does not perform well.
Reply With Quote Share with Facebook
  #7  
Old 12-12-2008
Senior Member
 
Join Date: Feb 2006
Location: Florida, US northeast
Posts: 100
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Dick Pluta is on a distinguished road
It is not for nothing that boats built for the charter fleet have stubby little masts. The guys who own those boats know that most charterers don't know when to reef.

Dick Pluta
AEGEA
Nassau, Bahamas
Reply With Quote Share with Facebook
  #8  
Old 12-12-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
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
reefing early is always a good idea.
__________________
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 Share with Facebook
Reply


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
main sail trim bkw Racing 3 06-22-2008 12:35 AM
Depowering the sails and twist jbr Learning to Sail 22 02-21-2003 09:23 PM
Synchronized Sail Trim Carol Cronin Racing Articles 0 03-16-2002 07:00 PM
Basic Mainsail Trim for Racers, Part Two Pete Colby Racing Articles 0 12-02-2001 07:00 PM
Basic Mainsail Trim for Racers, Part One Pete Colby Racing Articles 0 10-07-2001 08:00 PM


All times are GMT -4. The time now is 03:11 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.