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Board » Technical Support » polars

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Posted by
TUR_AC505


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2009-07-07 15:23:10
2009-12-31 00:03:35 - polars
what are the units on the polar diagrams that are given under helpful links?
Posted by
K3 (Bernd)


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2008-08-25 12:34:07
2009-12-31 02:19:02 - Re: polars
Hi Ahmet,
true windspeed in kts (TWS, horizontal axis) and true-wind-angle in degrees (TWA, vertical axis). The data shows the boatspeed in kts depending on TWA and TWS
ciao
Bernd
Posted by
TUR_AC505


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2009-12-31 06:16:54 - Re: polars
Thanks Bernd,
however when you check the polar diagram for 90 ft mono-hull (given with the Hobart-Sydney race) with the polar table under "helpful links" they don't match. The diagram is in Knots hence I deduct that the table should be in some other units.

Numbers without units are meaningless for engineers:)

Ahmet
Posted by
ernissss


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2008-12-15 12:42:03
2009-12-31 06:29:33 - Re: polars
Hi, Ahmet.
Sometimes TWS can be shown in m/s.

Ernestas
LT
Posted by
TUR_AC505


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2009-12-31 13:43:00 - Re: polars
Thanks Ernestas,

More likely, I will check this evening.

Happy New Year,
Ahmet
Posted by
Hew


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2008-12-15 00:35:22
2010-01-02 05:24:35 - Re: polars
Where is this "helpful Links" link to the polars for the boats. I can't find it or them, anywhere.
Posted by
Hew


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2008-12-15 00:35:22
2010-01-02 05:25:47 - Re: polars
Where is this "helpful Links" link to the polars for the boats. I can't find it, or them, anywhere.
Posted by
TUR_AC505


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2009-07-07 15:23:10
2010-01-02 05:35:02 - Re: polars
Hi Hew,
under the question mark (?) sign right next to the chat rooms on the main sailing page.
Posted by
AGage


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2008-12-27 10:31:57
2010-01-07 06:44:16 - Re: polars
TUR AC505 said @ 2009-12-31 06:16:54:
....
The diagram is in Knots hence I deduct that the table should be in some other units.

Numbers without units are meaningless for engineers:)

Ahmet
==============
Rather meaningless for the rest of us to Ahmet :-)

Dont understand why you cant find units though. Every polar file I have seen has something like this as the first line:
"TWSm/s";"TWSkt";"TWA";"SPDkt"
And usually data for each integer value of TWS in m/s...
Cant see units being omitted especially if you got file from SOL or brainaid...

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Posted by
Schakel


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2008-12-19 09:19:00
2010-01-07 07:36:03 - Re: polars
As I understand it: if the maximum wind speed shown in the polar file is less than 20, then the wind speed is in m/s. If the maximum wind speed is equal or greater than 20, then the wind speed is in knots.

HTH, HAND,
Philip

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