Cruisers Forum

Join CruisersForum Today

Thread Tools Search this Thread Rate Thread Display Modes
Old 14-04-2011, 10:28   #1
Registered User
sandycohen's Avatar

Join Date: Nov 2009
Location: New Orleans
Boat: 1979 Pearson 32
Posts: 85
Images: 3
Polar Diagram/VPP Resources

Does anyone know of a good resource of polar diagrams for older boats? I am trying to find one for my Pearson 32, without shelling out $300 to USSA.


sandycohen is offline   Reply With Quote
Old 14-04-2011, 18:26   #2
Registered User

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,705
Re: Polar Diagram/VPP Resources

What do you need it for? If for a real life situation, then just go out on the bay one sunny day and make yours.

For most practical purposes I found that similar boats make similar diagrams. In real life the choice of fore sails / kites will make most difference.

In Pearson you will have a super short WL and light displacement with relatively fine foils. Probably easy to get her up to speed in light conditions provided she gets good canvas, but not easy to keep her pointing high nor going fast in any good chop.


barnakiel is offline   Reply With Quote
Old 15-04-2011, 10:29   #3

Join Date: Nov 2008
Posts: 506
Re: Polar Diagram/VPP Resources

Call US Sailing in RI. I'll bet they have the data on file already for your boat.
bob perry is offline   Reply With Quote
Old 15-04-2011, 10:43   #4
CF Adviser
Bash's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Re: Polar Diagram/VPP Resources

Unlike Barnaiel, I find polars to provide useful data in conditions where I'm unable to achieve hull speed.

If you have a GPS system that measures VMG, velocity made good, you can use this as a substitute for polars. The way it works is quite simple: once you're close hauled, set a waypoint directly to weather and note your compass course and the VMG. Now, pinch up a few degrees, and determine how this effected VMG. If it went up, come up a few more degrees until the point where it no longer rises. If it went down, bear away a few degrees at a time until it comes up.

The advantage of using VMG on a GPS, rather than using polars, is that the VMG system will automatically compensate for such factors as surface chop, a dirty bottom, or less-than-new sails. The disadvantage is that you won't know whether you're getting the absolute best speed through the water you should be getting for a given amount of wind pressure.
cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 16-04-2011, 12:26   #5

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 15,348
Re: Polar Diagram/VPP Resources

Sandy, there used to be at least one freeware VPP calculator available online but I suspect the one you can buy from USAA will be better. Your other alternate sources are to try other owners, owner groups, etc. to see if anyone will give you a copy. VPPs are not easy to come by, in general.
hellosailor is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Orana 44: Polar Diagram tehansen Fountaine Pajot 0 13-11-2010 10:29
Same old, same old in the polar regions knottybuoyz Polar Regions 4 07-03-2008 17:44
Search for Bene361 Polar George P Monohull Sailboats 5 12-01-2008 14:37
Lk. Superior - Not Exactly Polar... GordMay Polar Regions 0 05-11-2003 03:50

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:27.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.