leeway questions - SailNet Community
 
LinkBack Thread Tools
post #1 of 3 Old 06-29-2005 Thread Starter
Junior Member
 
Join Date: Jun 2005
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
leeway questions

hello,

i got a couple of questions on leeway. i''m not sure if this term is correct, i''m talking about the sideways drift of the boat while sailing.

First, is there any way to compute that value? i have heard that if you want to go for example from point A to point B, the fastest way is not to point the boat directly to point B, but a little towards windward. Is this true? If so, how can you assess how much exactly to compensate. Is there any rule? or just experience?

Also, as a beginner i get contradicting oppinions on how much a sailboat can lean sideways witout loosing speed (both absolute speed and speed with reference to the destination including drifting)

I got people telling me that up to 40 degrees is OK, but other insist that you should reduce sail if you get that kind of leaning and you''d be going faster.

thank you and sorry for my bad english
sailor_ben is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 3 Old 06-29-2005
Senior Member
 
Join Date: Jun 2005
Location: New Orleans
Posts: 1,999
Thanks: 8
Thanked 37 Times in 34 Posts
Rep Power: 11
 
leeway questions

Ben, the traditional answer about leeway is that it''s just experience, since various designs of boat may have different rates of "sideslip" or leeway. It varies too depending on what point of sail you''re on (more leeway sailing close-hauled than on a broad reach, for example), wind strength, height and type of seas, and how much you''re heeling. On a passage of some length, you might head, say, 5 degrees above the charted course and see how it goes.

The "modern" answer, if you have GPS, might be to compare your GPS course-made-good to your course steered. The difference (assuming there''s no current) would be your boat''s leeway.

As to leaning sideway ("heeling") most boats are designed to heel about 10-15 degrees for maximum speed sailing upwind. At 20-25 degees, it''s time to reduce sail. 40 degrees is extreme, any sailboat heeling that far is carrying way too much sail and is overpowered.

Excessive heeling also creates excessive leeway, as the hull and keel become less efficient at resisting sideslip when they become less "vertical" during excessive heeling.
nolatom is offline  
Quote Quick Reply Share with Facebook
post #3 of 3 Old 06-30-2005
Senior Member
 
Join Date: Dec 2003
Posts: 1,461
Thanks: 1
Thanked 26 Times in 25 Posts
Rep Power: 12
 
leeway questions

Also with most keelboats your cross track error, (that is where you go as compared to where you pointed), is affected more by currents, helmsman deviation and compass error than by leeway from the boat sliding sideways. Usually when piloting most people lump all this deviation together & call it leeway or XTE and so use it to correct their DR plot.
capttb is online now  
Quote Quick Reply 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:
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
Looking to buy a boat in the DC area and have some questions FRRizzo111 Boat Review and Purchase Forum 10 06-02-2004 06:20 PM
New X-46 -- New Intro -- First Questions John-A Boat Review and Purchase Forum 8 01-29-2004 08:21 PM
Newbie here with a few questions! Goodfreak General Discussion (sailing related) 4 12-07-2002 02:44 PM
Free boat for me - lots of questions jiffy General Discussion (sailing related) 13 11-16-2002 07:28 PM
Some specific questions... egallant Cruising & Liveaboard Forum 4 12-04-2001 08:30 AM

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