OpenCPN,  selon Shoreline
Plan du site   --->  Les compléments  --->  Routage météorologique, Polaires
P_19_C Routage météo (Weather-Routing), Polaires d'un bateau.
Validité :  4.2
Météo-Routage Généralité
Météo-Routage Aide
Polaires d'un bateau
  • "Weather-Routing" est traduit ici par "Météo-Routage"
  • Dans la suite de cette page, les acronymes MR et WR signifieront respectivement "Météo-Routage" et "Weather-Routing".
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  • Nota bene :
    • Cette partie actuellement issue du site web opencpn.org est en Anglais.

Polaires d'un bateau :

OpenCPN  weather_routing_pi    and the required polar format

The weather_routing_pi plugin references several files located in c:/ProgramData/opencpn.

To see where these files are set in the plugin, select a route or make a new one. Pick Configuration --> Edit.
Then pick Boat  "Edit" a tabbed dialogue box will open.

"Plot Details" Tab  has Open, Save and Save as buttons. This is the pointer to the <boat>.xml file which contains the boat characteristics, it is initially set to "boat.xml".  After you have gone through all the tabs and set the boat's Lwl, Loa, Displacement, etc. you should "Save as" using your boat's name. Then "open" that file each time weather_routing needs those settings..

Initially under <Configuration > Edit > Boat Edit > Plot Details [tab] the file referenced is "boat.xml". 
Make sure you have a file "boat.xml" in your opencpn data directory, if you are having troubles, download a boat.xml file and "load" it.


The second file is under <Configuration > Edit > Boat Edit > Polar [tab] and this is an optional polar file  "<boat>.csv"
"Polar File" Tab shows the path of the Polar file being used, if one exists, otherwise the program has builtin VPP calculation using the boats characteristics which have been entered, which is in effect when the path shows as  "<computed>". 

If you have prepared a polar file in the Opencpn format for your boat, you can load it into the plugin from this tab, and after you "Save" from the "Plot Details" tab, the pathname willl be remembered   [note the pathname in the sample <boat>.XML file below].


Sometimes the plugin is picky about these files. If it is close the plugin and opencpn and reopen, to reset it. Then try again.
The two sample files are shown below. They are paired. If you load the XML file the referenced polar file will be loaded if it is in the path and the correct format.

Shannon38-opencpn-roundtrip.XML   [This is the <boat>.XML file]
<?xml version="1.0" encoding="utf-8" ?>
<OCPNWeatherRoutingBoat version="0.9" creator="Opencpn Weather Routing plugin">
    <BoatCharacteristics displacement_tons="21" lwl_ft="34" loa_ft="38" beam_ft="11" />
    <BoatDrag frictional_drag="0.0170" wake_drag="0.9500" />
    <Plan Name="Initial Plan" computed="0" csvFileName="C:\ProgramData\opencpn\Shannon38-opencpn.CSV" />
</OCPNWeatherRoutingBoat>

Shannon38-opencpn.CSV     [This is the <boat polar>.csv file.]
twa/tws;6;8;10;12;14;16;20
0;0.00;0.00;0.00;0.00;0.00;0.00;0.00
30;0.00;0.00;0.00;0.00;0.00;0.00;0.00
40;2.80;4.10;4.60;4.70;4.90;5.00;5.10
45;4.00;4.90;5.20;5.50;5.70;5.80;5.90
52;4.50;5.40;6.10;6.40;6.60;6.70;6.80
60;5.00;6.00;6.50;6.70;6.80;6.90;7.00
75;5.50;6.40;6.80;7.00;7.20;7.30;7.40
90;5.70;6.60;7.00;7.30;7.50;7.60;7.70
110;5.80;6.70;7.10;7.40;7.60;7.70;7.90
120;5.50;6.50;7.00;7.30;7.60;7.90;8.20
135;4.80;6.00;6.60;7.00;7.40;7.70;8.30
150;4.00;5.00;5.90;6.50;6.90;7.30;7.90
165;3.70;4.80;5.20;6.20;6.60;6.90;7.50
180;3.30;4.20;4.70;5.90;6.30;6.60;7.20


qtVLM  Polar Format
http://wiki.virtual-loup-de-mer.org/index.php/QtVlm_Polar_Diagram
     Extension of the file name. Csv
    Separator ';' (semicolon)
    Double-entry table
        The first cell always contains 'TWA \ TWS'
        The first line lists the wind forces. Vlm does not go beyond 60 knots of wind.

Beginning of each line ** gives the look, then each value corresponding to the shape and strength of the wind (column heading)

    The digital data of the polar use a decimal point, 'that is the point.' An integer (no point ended) is valid.
    Whites are valid (value = 0.0) but discouraged. Thank you for being explicit
    Text file format is UNIX ie lines that are terminated by LF (Line Feed) and not CR (Carriage Return) and LF. A good text editor windows (PsPad or Notepad + +) knows rerecord this format.

TWA\TWS;0;2;4;6;8;10;12;14;16;18;20;22;24;26;28;30;32;34;36;38;40;42;44;46;48;50;52;54;56;58;60
0;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000;0.000
5;0.000;0.210;0.420;0.630;0.800;0.860;0.920;0.940;0.950;0.970;0.980;0.980;0.990;0.950;0.880;0.810;0.740;0.670;0.600;0.530;0.460;0.370;0.280;0.190;0.090;0.000;0.000;0.000;0.000;0.000;0.000


=====

Maxsea Polar Format  (same as Adrena, or SailGrib WR)
http://www.sailgrib.com/wr-user-guide

The first row defines the True Wind Speed.
The first column defines the True Wind Angle
In the example, the theoretical hull speed for various wind velocities and wind angles is in the cells.
Modify the True Wind Speed values in the first row. The example below uses 10 and 30 Kts.
Enter these values in the first row and delete the other columns.

In an Excel spreadsheet
TWA    10     15     20      25
30        2.0    5.4   7.2      7.9
90        4.7    9.5    11.5   12.8
150      2.9    7.4     10.5   13.0
 

http://www.sailingperformance.com/Products.html
Expedition http://www.expeditionmarine.com/index.html
Isler  http://www.islersailing.com/new_page_3.htm
BLUR Boats and Polars  http://www.blur.se/boats/


Bluewater Racing, and Expedition Polar file format
http://www.bluewaterracing.com/bluew...#_Toc343740589

 
Quote:
A polar file is a sequence of lines. Each line describes the curve for one windspeed, ws. Optionally, the first line may begin with the string "pol", in which case it is treated as a comment line. This klunky format is not my idea; it is for compatibility with Expedition and other software tools, and because it loads easily into spreadsheet tools such as Excel.

Each curve is described on one line of the text file by a windspeed, followed by a sequence of pairs of True Wind Angle and boatspeed. (TWA in degrees, BSP in knots)
eg:

10 30 0 45 6 90 8.1 160 7 180 5
15 30 0 40 8 90 12 150 10 165 9 170 5

This gives two curves, one for windspeed 10, one for windspeed 15. Different curves may have different TWA points, and different numbers of points. The line for windspeed 10 specifies a boatspeed of zero knots at a true wind angle of 30 degrees, a boatspeed of six knots at TWA 45, 8.1 knots at 90, seven knots at 160 degrees, and five knots at 180 degrees.

There can be a zero windspeed curve with non-zero boatspeed, i.e., “when the wind is gone, the motor's on.”

Rules for the data in polar files:
1) One windspeed curve per line.
2) There must be a least 3 points per curve.
3) There must be at least one non-zero windspeed curve.
4) The minimum TWA is zero, and the maximum is 180.
5) The 2nd smallest TWA in a line is the best VMG upwind angle for that windspeed. The 2nd largest TWA is the best VMG downwind angle for that windspeed
6) The first TWA should be less than any 2nd TWA in any curve. Ideally, zero.
7) The last TWA should be greater than any 2nd-to-last TWA in any curve. Ideally, 180

If these rules are broken, the behavior of the program is undetermined.

Example
2 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
4 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
6 24  28  32  36  40  44  48  52 4.5 56  60 5 64  68  72  76 5.5 80  84  88  92 5.7 96  100  104  108  112 5.8 116  120 5.5 124  128  132  136 4.84 156  160  164  168  172  176  180
8 24  28  32  36  40  44  48  52 5.4 56  60 6 64  68  72  76 6.4 80  84  88  92 6.6 96  100  104  108  112 6.7 116  120 6.5 124  128  132  136 6 140  144  148  152 5 156  160  164  168  172  176  180
10 24  28  32  36  40  44  48  52 6.1 56  60 6.5 64  68  72  76 6.8 80  84  88  92 7 96  100  104  108  112 7.1 116  120 7 124  128  132  136 6.65.9 156  160  164  168  172  176  180
12 24  28  32  36  40  44  48  52 6.4 56  60 6.7 64  68  72  76 7 80  84  88  92 7.3 96  100  104  108  112 7.4 116  120 7.3 124  128  132  136 7 140  144  148  152 6.5 156  160  164  168  172  176  180
14 24  28  32  36  40  44  48  52 6.8 56  60 6.8 64  68  72  76 7.2 80  84  88  92 7.5 96  100  104  108  112 7.6 116  120 7.6 124  128  132  136 7.4 140  144  148  152 6.9 156  160  164  168  172  176  180
16 24  28  32  36  40  44  48  52 6.7 56  60 6.9 64  68  72  76 7.3 80  84  88  92 7.6 96  100  104  108  112 7.7 116  120 7.9 124  128  132  136 7.7 140  144  148  152 7.3 156  160  164  168  172  176  180
18 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
20 24  28  32  36  40  44  48  52 6.7 56  60 7 64  68  72  76 7.4 80  84  88  92 7.7 96  100  104  108  112 7.9 116  120 8.2 124  128  132  136 8.3 140  144  148  152 7.9 156  160  164  168  172  176  180
22 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
24 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
26 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
28 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
30 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
32 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
34 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180
36 24  28  32  36  40  44  48  52  56  60  64  68  72  76  80  84  88  92  96  100  104  108  112  116  120  124  128  132  136  140  144  148  152  156  160  164  168  172  176  180 140  144  148  152 140  144  148  152


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