Passport 40 Polars?

[Gary Miller]

Does anyone know where I might find access to a copy of the performance Polars for a Passport 40? Hopefully in a grib format?

Gary

[Michael Moradzadeh]

Here is an older one.

On Fri, May 7, 2021 at 2:16 PM Gary Miller <ga...@garynmiller.com> wrote:

Does anyone know where I might find access to a copy of the performance Polars for a Passport 40? Hopefully in a grib format?

Gary

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[Kenyon Stewart]

I can't vouch for the accuracy, but a quick google search turned up this data sheet with polar.

http://sailonline.org/static/var/sphene/sphwiki/attachment/2021/01/14/Passport_Cruise_40.pdf

Kenyon

On Fri, May 7, 2021 at 2:16 PM Gary Miller <ga...@garynmiller.com> wrote:

Does anyone know where I might find access to a copy of the performance Polars for a Passport 40? Hopefully in a grib format?

Gary

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[Michael Moradzadeh]

That's actually a set of polars that I tweaked for an online game on Sailonline.  You would not want to use those!

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[Kevin Connell]

These are generated mathematically, right?  Does anyone have any empirical ones?   Not sure I can do 4 kts at 27AWA...lol..  

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[paw...@gmail.com]

I'm actually creating them now. I must point out that online polars are wildly optimistic. Now if you want Polar for Apparent Wind, its quite a different beast to those for True Wind. True Wind polars are much more useful for Weather routing. Trouble is to get emperical ones requires an understanding of tidal streams, plays hell with leeway and STW. How do you get info on Leeway, well I reckon its proportional to the sine of the Apparent wind * k (for constant) but I could be wrong. Getting data in I use Navmon PC & its transmitted to my W10 lap top via a Vesper AIS (but there are other MUXs), well I can help you with spread sheet manipulation but my data is for my particular vessel, that thou it is a Passport, mine is custom made, and not in Taiwan. My sailplan is a jib bout a #2 and a 31 yo Main.

I have enough data now but need to test it, but the only thing I can say with some certainty is running with freewheeling prop aids my speed, I anticipate that changing to feathering prop will double that, to say half knot at 5.5 knots.

Ask if you want a excel Sample spread sheet.