Author Topic: P323 Boatspeed  (Read 1644 times)

selene

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P323 Boatspeed
« on: July 24, 2019, 10:57:21 PM »
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

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Re: P323 Boatspeed
« Reply #1 on: July 27, 2019, 10:23:34 PM »
And, thanks to a friend with Navionics, a 323 polar chart. :-)


CaptBeaston

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Re: P323 Boatspeed
« Reply #2 on: July 29, 2019, 02:42:13 AM »
awesome thank you very much
Mike Beaston