Which way is the wind flowing??? - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 20 Old 04-07-2008 Thread Starter
On the hard
 
CharlieCobra's Avatar
 
Join Date: May 2006
Location: Bellingham, WA.
Posts: 3,503
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 11
   
Which way is the wind flowing???

Scenarios on a boat with hull speed of 8 knots.

Reaching at 10-15 knots TWS: Wind flow fore to aft.

Broad Reach 10-15 knots TWS: Winds flows aft forward?

Reaching at 30-35 knots TWS: Wind flows fore to aft, sorta.

Broad Reach at 30-35 TWS: Wind flow aft forward for sure.

Whaddya think? What's the flow looking like at the angles and wind speeds? Is the flow tearing away at high speed on the Reach or not? I don't have telltales on my sails and just sail by the cloth so I can't say for certain what the wind is really doing flow wise in these situations.
CharlieCobra is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 20 Old 04-07-2008
Once known as Hartley18
 
Classic30's Avatar
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,798
Thanks: 45
Thanked 65 Times in 65 Posts
Rep Power: 9
   
Dock
CC, why don't you ask your wife for a short length of wool and tie about 1' of it on either side-stay about head height?

It's not expensive and would really help you work it out in real-time.

-
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
Classic30 is offline  
Quote Quick Reply Share with Facebook
post #3 of 20 Old 04-07-2008 Thread Starter
On the hard
 
CharlieCobra's Avatar
 
Join Date: May 2006
Location: Bellingham, WA.
Posts: 3,503
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 11
   
Yeah, I looked at telltales the last time I was in WM but didn't buy any. I use the Windex for direction usually and watch the Headsail luff and Mainsail shape. I guess I oughta get some during refit.
CharlieCobra is offline  
Quote Quick Reply Share with Facebook
post #4 of 20 Old 04-07-2008
Once known as Hartley18
 
Classic30's Avatar
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,798
Thanks: 45
Thanked 65 Times in 65 Posts
Rep Power: 9
   
Dock
Quote:
Originally Posted by CharlieCobra View Post
Yeah, I looked at telltales the last time I was in WM but didn't buy any. I use the Windex for direction usually and watch the Headsail luff and Mainsail shape. I guess I oughta get some during refit.
CC, you don't really need to buy telltales... You have a nice old boat and IMHO, unless you're seriously into racing, a couple of bits of wool would probably tell you all you need to know and look a lot more "in character" than a Windex and telltales on all your sails.

We've got a Windex but I hardly ever use it. Two reasons:
1. In steep chop and light airs, the bloody thing can spin though 360 degrees and I know the wind isn't doing that.
2. My neck gets sore staring up at the top of the mast!

-
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
Classic30 is offline  
Quote Quick Reply Share with Facebook
post #5 of 20 Old 04-07-2008
Thanks Courtney.
 
Join Date: Sep 2006
Location: IL
Posts: 3,954
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 11
     
Refit???? You just need some yarn or a piece of casette tape tied to the shrouds. You can also buy a set of telltales that come with little stick on disks that allow you to retrofit them to your sails. Cheap and easy.

hunter Legend 37 Semper Paratus
Formerly - Tartan 34C Yawl
T34C is offline  
Quote Quick Reply Share with Facebook
post #6 of 20 Old 04-07-2008
Armchair Horn Sailor
 
Alden68's Avatar
 
Join Date: Mar 2007
Posts: 328
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 9
 
I second the sticky disk ones. As you are apparently very interested in flow, I think you would benefit greatly from telltales, especially on the head sail.

Your sail may look full, but the tell tales do just that, tell you what part of the airfoil is stalling. If you enjoy screwing around with sail control lines, as I do, they give you lots of oportunity to play with trim, twist, etc to maximixe the amount of lift.
Alden68 is online now  
Quote Quick Reply Share with Facebook
post #7 of 20 Old 04-07-2008
Sailor
 
Plumper's Avatar
 
Join Date: Nov 2007
Location: Vancouver Island
Posts: 845
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
On broad reaches tell tales don't do much anyway. Once the apparent wind is abaft the beam the sails aren't really giving much lift, they are pulling the boat. From a beam reach and higher the telltales tell all about sail shape.

There is a tide in the affairs of men,
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
Shakespeare, Julius Caesar IV, iii, 217
Plumper is offline  
Quote Quick Reply Share with Facebook
post #8 of 20 Old 04-07-2008
Once known as Hartley18
 
Classic30's Avatar
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,798
Thanks: 45
Thanked 65 Times in 65 Posts
Rep Power: 9
   
Dock
Quote:
Originally Posted by T34C View Post
Refit???? You just need some yarn or a piece of casette tape tied to the shrouds.
Oops, I just realised you lot call it "yarn" over there.. "wool" being the white stuff on the back of a sheep!

Hope I didn't cause any confusion.

-
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
Classic30 is offline  
Quote Quick Reply Share with Facebook
post #9 of 20 Old 04-07-2008
Armchair Horn Sailor
 
Alden68's Avatar
 
Join Date: Mar 2007
Posts: 328
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 9
 
You put sheep on your sails??????????

Alden68 is online now  
Quote Quick Reply Share with Facebook
post #10 of 20 Old 04-07-2008
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,534
Thanks: 104
Thanked 312 Times in 300 Posts
Rep Power: 10
     
Charlie, for a cheap trial find some sticky tape and dig into your old cassette collections and rip out some magnetic tape.

Cut some 6-8 inch lengths and stick them onto your sails and shrouds and check it out.

Once you find the best location on your boat (for accuracy and visibility) then decide which permanent type you want - wool (yarn) or purchased ones. (they won't break the bank)

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)
Faster is offline  
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
Wind Orientation Mark Matthews Learning to Sail Articles 0 03-06-2005 07:00 PM
Charging with Wind Power Kevin Jeffrey Cruising Articles 0 04-21-2003 08:00 PM
Understanding Apparent Wind Steve Colgate Learning to Sail Articles 0 11-10-2002 07:00 PM
Understanding Apparent Wind Steve Colgate Seamanship Articles 0 11-10-2002 07:00 PM
Understanding Apparent Wind Steve Colgate Racing Articles 0 11-10-2002 07:00 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