General Category - Pearson Owners and Enthusiasts > Boat Handling

P323 Boatspeed

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selene:
So..there have been a few comments in the past about P323 boat speed and polar charts. Sadly Pearson (AFAIK) was not much help with this.

A couple of years ago I came across a spreadsheet program called PCSail developed by a student at the University of Michigan. Sadly it needs a really old version of excel to work - 2003, I think - and so I can't get it going on my current PC (and vbasic experts out there?). Full download can be found here: http://www.cruisersforum.com/forums/f134/pcsail-excel-sheet-to-make-vpp-for-sailing-yachts-89998.html. 

Anyway, before my old version of excel became unusable, I developed a rough polar chart, and a speed table - which holds up pretty well for me (for data fiends I can post my assumptions upon request).  I keep this table in my cockpit so I can check if my sail trim is optimal. For your edification, here is is:

Selene   
       Wind                       Jib size
       (kts)              87%               99%
                                    Max VMG
~40º (Close hauled)   
   5               3.2                3.4
   7               4.2                4.3
   10               5.1                5.2
   14               5.7                5.7
   19               5.9                5.9
         
65º    (Close Reach)
   5               3.9                4.0
   7               5.0                5.1
   10               6.1                6.2
   14               6.7                6.7
   19               7.0                7.0
         
90º   (Beam Reach)
   5               3.8                4.0
   7               4.9                5.1
   10               6.1                6.2
   14               6.8                6.8
   19               7.0                7.0
         
120º   (Broad Reach)
   5               2.5                2.6
   7               3.4                3.5
   10               4.6                4.7
   14               5.8                5.9
   19               6.7                6.7
         
178º   (running/DDW)
   5               2.1                2.2
   7               2.9                2.9
   10               4.0                4.1
   14               5.4                5.4
   19               6.6                6.6

selene:
And, thanks to a friend with Navionics, a 323 polar chart. :-)

CaptBeaston:
awesome thank you very much

SailingSwede:
Thank You!! Very useful. :)

DavidG:
Selene, thank you for the information.  I will use this to see how these data tools work with my P323, Independence!   Also not knowing if you're following this thread anymore, it somewhat perplexes me in regards to some other threads about pointing ability of the P323 and until I get more first-hand feedback from my P323, the polar speed chart (as well as the table); these imply the boat will point at least 45 degrees with modest performance!?  Others imply that 110 degrees is best tacking capability, which I am assuming is maximum performance (speed) verses beating off a lee shore capability?  I also assume the wave/wind work against making ground too...  Thanks again for the data charts!

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