There are four ways to get polars that I know of:
1. VPP Calculated from the boat specs using VPP programs. PCsail is a spreadsheet version of that. It will give you a decent set of polars for your boat to start with, then you will want to adjust them for various physical boat changes, sea conditions, sail sets, actual weight, barnacles
2. Recorded from calibrated instruments through a Nmea
bus connection to the PC using a Polar program intended to record
the data by hand, making note of wind
direction & wind
speed, boat speed, sea and sail conditions, current
, etc. This is an organized way of recording what you already know from experience about your boat, and it can be very effective if you approach it methodically, picking good conditions, knowing currents or finding slack tide, and getting good long runs with constant conditions if possible.
4. Get polars from a friend who has the same boat.
There are paid programs
such as Expedition, Maxsea
and Ocham which have polar recording and averaging built in.
PC Programs for Polar
(open) Polauto and NavMonPC for that matter you could use Opencpn
to record the data, and try using Konni's new Polar plugin to create polars.
If you have a nmea
output with apparent wind speed and direction (true would also be good but not necessary), gps
and speedo, you can connect your PC and record the data with NavMonPC or with Polauto. If you record with NavMonPC saving files, you can then run chosen file segments with specific conditions through Polauto and generate polar data. You can also use Polauto to record the data and create the polar at the same time. Polauto has a number of user settings that will enable filtering and averaging of data on a given run, to get a good plot. These user settings are very useful, because the wind varies a lot, as does boat speed and heading (less so). (Also you need to pick good times for recording and devote attention to that task so you get good runs with clean data.)
This is the first full summer season for Polauto in its current
state, and I am hopeful that people are finding it very useful. I worked with Patrick to improve his program, and I hope that after the summer he'll have a host of users ready to make suggestions and improve the program, maybe simplify it a little based upon experience. I have tested it using Opencpn
streaming Nmea data to Polauto via a COM port, and NavMonPC reading the Nmea data file and sending it to Opencpn, and have been able to give Patrick some suggestions and ideas.
Test Polauto by using OpenCpn w/o instruments
Now Polauto will read nmea data files itself, as well as accept a nmea data stream through a COM port.
I would suggest trying Polauto which is a Windows program. See the end of this thread. PCSail - Excel sheet to make VPP for Sailing yachts
Polauto - translated - download is on this page.
Also, don't discount the Opencpn - Polar plugin by Konni. It is probably nice and simple and works well, but I have not tested it yet.
Of course you could contact Endeavor and as them for VPP calcs and Polars for your boat, often the manufacturer or designer
may have them.