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Board » Technical Support » polars

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Posted by TUR_AC505 Posts 72 Registered at 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) Posts 130 Registered at 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 Posts 72 Registered at 2009-07-07 15:23:10	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 Posts 23 Registered at 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 Posts 72 Registered at 2009-07-07 15:23:10	2009-12-31 13:43:00 - Re: polars
	Thanks Ernestas, More likely, I will check this evening. Happy New Year, Ahmet
Posted by Hew Posts 36 Registered at 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 Posts 36 Registered at 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 Posts 72 Registered at 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 Posts 411 Registered at 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... --- Last Edited by RainbowChaser at 2013-06-20 08:57:41 --- I help develop the client interface for the best online ocean racing sim there is... __/)/)_/)__
Posted by Schakel Posts 183 Registered at 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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