Polar Diagrams - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 19 Old 04-15-2012
Junior Member
 
Join Date: Jun 2004
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Polar Diagrams-Newport41-Benetaeu 421

Newport41

TWA 6 8 10 12 14 16 20
52 5.0 5.9 6.4 6.6 6.7 6.8 6.9
60 5.3 6.3 6.7 6.9 7.0 7.1 7.2
75 5.7 6.5 6.9 7.2 7.4 7.5 7.6
90 5.9 6.7 7.1 7.3 7.4 7.6 7.9
110 5.8 6.7 7.1 7.5 7.7 7.9 8.2
120 5.5 6.5 7.0 7.4 7.7 8.0 8.5
135 4.8 6.0 6.7 7.1 7.5 7.9 8.5
150 4.0 5.1 6.0 6.6 7.1 7.4 8.1


Benetaeu 421


TWA 6 8 10 12 14 16 20
52 5.5 6.4 6.9 7.1 7.3 7.4 7.4
60 5.9 6.8 7.2 7.4 7.5 7.6 7.7
75 6.2 7.1 7.5 7.7 7.9 8.0 8.2
90 6.3 7.2 7.6 7.8 8.1 8.3 8.5
110 6.2 7.1 7.7 8.0 8.3 8.5 8.8
120 5.8 6.9 7.5 8.0 8.3 8.6 9.1
135 5.0 6.3 7.1 7.6 8.1 8.5 9.1
150 4.2 5.3 6.3 7.0 7.5 8.0 8.7
georgesoilis is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 19 Old 04-15-2012
Senior Member
 
JordanH's Avatar
 
Join Date: Dec 2008
Location: Canada
Posts: 324
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Re: Polar Diagrams

I've been curious about my Contessa 26... I wonder if anyone has bothered to create a polar for them.
JordanH is offline  
Quote Quick Reply Share with Facebook
post #13 of 19 Old 04-20-2012
Member
 
Join Date: Sep 2007
Location: California
Posts: 43
Thanks: 2
Thanked 2 Times in 2 Posts
Rep Power: 0
 
Re: Polar Diagrams

Most interesting.

Polar Diagrams used to be published with every sailboat review in the old issues of Yachting, Rudder and the like. You do not see them anymore. I wonder why. Perhaps the fact that they START at 52 degrees from the true wind angle is a clue.

As a point of reference, my IOD, designed in 1938, and horribly slow, inefficient, and otherwise unsuitable by modern standards, sailed at an average of 39 degrees to the true wind as measured by the course over the ground between known landmarks on the shore of a relatively narrow channel (The Alameda Estuary, Oakland California.) This was before gps, so some experimental error is in there but this is an average of about a dozen runs up the same channel, roughly six legs, dead to windward usually, and it is taken from courses plotted on a chart, by reference to shore marks at each tack. And we were not pinching or trying to prove point. I only did the measurements after the fact when a question like this came up. We were just sailing.

I suppose if I were the NA of a thing that couldn't go much closer to the wind than 50, or even 45 degrees, I would not want the curves published either.
keforion is offline  
Quote Quick Reply Share with Facebook
post #14 of 19 Old 06-27-2012
Senior Member
 
Join Date: Mar 2006
Location: VA
Posts: 2,050
Thanks: 1
Thanked 4 Times in 4 Posts
Rep Power: 10
 
Re: Polar Diagrams

Quote:
Originally Posted by Grendler View Post
Diagrams are from 33ft (Pearson, Contessa) up to 60ft (Centurion, Deerfoot, Swan). Sorry

Catalina I got only 36 model:

TWA 6 8 10 12 14 16 20
52 4.9 5.8 6.3 6.6 6.8 6.9 7.0
60 5.3 6.2 6.7 6.9 7.1 7.2 7.3
75 5.6 6.5 6.9 7.3 7.5 7.6 7.7
90 5.7 6.7 7.1 7.4 7.6 7.8 8.1
110 5.6 6.6 7.1 7.5 7.8 8.1 8.4
120 5.3 6.4 7.0 7.4 7.8 8.1 8.6
135 4.7 5.8 6.6 7.1 7.5 7.9 8.5
150 3.9 4.9 5.8 6.6 7.0 7.5 8.2
Thanks but these seem hoplessly optimistic for my TR, WK C36 with newish <4 y.o. dacron sails. I can only comment on the upwind to beam reach figures, since I believe these polars assume a spinniker once past a beam reach and my boat is not set up with spin gear.

Also, Since the wind angle is given as true, I'm assuming the wind speeds are also supposed to be true. Any idea if that's a valid assumption?

PalmettoSailor
s/v Palmetto Moon
1991 Catalina 36
PalmettoSailor is offline  
Quote Quick Reply Share with Facebook
post #15 of 19 Old 06-27-2012
Senior Member
 
JordanH's Avatar
 
Join Date: Dec 2008
Location: Canada
Posts: 324
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Re: Polar Diagrams

PalmettoSailor, you are correct. They are true wind speed and direction.

I came across this PDF that explains it better than I can.
http://www.ockam.com/docs/SplainPolars.pdf
JordanH is offline  
Quote Quick Reply Share with Facebook
post #16 of 19 Old 08-17-2012
Junior Member
 
Join Date: Aug 2012
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Polar Diagrams

Grendler....you wouldn't happen to have Polars for a 1982 Pearson 37R would you?

Thanks in any case.

Greg
greggus2003 is offline  
Quote Quick Reply Share with Facebook
post #17 of 19 Old 08-21-2012
Senior Member
 
paulk's Avatar
 
Join Date: Jun 2000
Location: CT/ Long Island Sound
Posts: 2,610
Thanks: 4
Thanked 26 Times in 25 Posts
Rep Power: 16
 
Re: Polar Diagrams

US Sailing has polars for just about anything with sails that floats, but they're not free or cheap. I believe their diagrams show angles of attack from closer to 0 degrees to 180. You can also create your own diagrams empirically, but it's a lot of work to document all the wind speeds, angles, and boat speeds.
paulk is offline  
Quote Quick Reply Share with Facebook
post #18 of 19 Old 03-16-2013
Junior Member
 
Join Date: Mar 2013
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Polar Diagrams

Does someone have the polars available from a gib'sea 444 or 442?
Vanpupi is offline  
Quote Quick Reply Share with Facebook
post #19 of 19 Old 05-27-2014
Junior Member
 
Join Date: May 2014
Location: San Diego
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Send a message via Skype™ to mickmoore
Re: Polar Diagrams

Hello,
I am looking for a Polar Diagram for a Ranger 37...
Would you happen to have one?
Best, Mick Moore
San Diego
mickmoore 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
Question on Polar Diagrams Ilenart Sailboat Design and Construction 6 04-15-2012 01:04 PM
Cal 30 Polar Diagrams? WinterRiver Cal 5 04-15-2012 12:59 PM
Electrical wiring Diagrams yelnats69 Gear & Maintenance 5 10-01-2009 11:52 AM
wiring diagrams for catalina30 marinoinPV Gear & Maintenance 6 11-17-2007 08:42 AM
Racing Diagrams zeniam1 Racing 0 06-24-2002 08:48 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