Polars: max speed
Post by iconPost by lotsemann | 2014-11-25 | 00:19:56

Dear Cvetan,


Is it possible to add information about the maximum speed to the data about optimum upwind and downwind angles?

Thanks for your attention!

commenticon 5 Comments
Post by iconPost by redcobra | 2014-11-25 | 10:27:17
Hello,

I would also add a question to this: the sailing simulator is recommending me a constant TWA of 50° (port) for the next 9 hours and gives a heading of 70° (in this moment). On the other side the Polar chart tells me that the optimal TWA for my actual boat speed is TWA=49°. How to deal with this delta of one degree?

Thanks
Post by iconPost by zezo | 2014-11-25 | 14:20:42
It would be better to sail the perfect TWA if possible, but for your position that would mean switching from 51 to 49 at some point. You can see in the polar chart exactly how much speed you lose with one fixed twa.

You can also use the green track line to see approximately which twa gives best progress compared to the blue isochrone lines.

Please note that when there is a wind gradient the dots on the track tool lines don't always match the isochrones _exactly_ because the longer-period isochrones are generated with more than 10-minute step and that changes the result slightly.
Post by iconPost by lotsemann | 2014-11-25 | 17:50:26
Another thing to consider:

Depending on the circumstances, the VMG for one degree less or more than the optimum is very close or equal to the optimum.This may also lead to such deltas.
Post by iconPost by zezo | 2014-11-25 | 18:44:14
Yes, indeed. VMG for the example above with wind speed 8.8 are like 5.95, 5.97 and 5.98 for 49-51°
Post by iconPost by redcobra | 2014-11-25 | 17:07:46
Many thanks for your feedback!
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Stick Pins show up on VORG control console.
13
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Wrong speed and TWA
1
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I'm starting feeling of being on the wrong side of the force...
11
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Data mining
6
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Friends ?
9
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Lack of black dots
6
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Actual wind in SS at a specific coord
3
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Wind barbs coming back?
4
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VOR - Leg 2 - Rodrigues
2
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routing for first leg?
2
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Difference in Routing Prediction?
10
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2 Boats 2 Destinations?
8
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What if...
3
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Google Earth view of Leg 1
17
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Current Winds In Chart
18
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HAPPY BIRTHDAY, CVETAN!
4
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Another rookie question
3
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stupid question...
6
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Leg 2 - Game interface changes
5
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Google chrome extension
9
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Leg 2 - Cape Town to Abu Dhabi
1
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VORG is using a weird calendar?
3
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VORG - something wrong in wind?
3
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VORG - And now after the gate...
4
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EARLY
8
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importing winds into VR tool
3
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Downtime
3
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Maximum VMG question
3
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Why does the predicted route significantly change when changing the number of days?
7
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VORG 2011-2012 available
48
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Clipper Round the World (no track !!)
1
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UI changes
9
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Congratulations Cvetan!
5
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Wind direction and speed
1
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chart is not working well
15
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Clipper Round The World 11-12
29
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How do I find my boat?
2
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Transat Jacques Vabre
39
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Jules Verne Trophy 2011
3
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VOR-Game 2011/12
7
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Trophee Jules Verne 2010
29
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transat jacques vabre
2
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Polardiagram for Betaversion VorG?
2
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Transat Jacques Vabre 2011 imoca.
4
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Using Smartphones
3
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The Clipper
18
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A better "game"?
24
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Zezo is broken?
2
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La Solitaire du Figaro 2011
7
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VORG 2011
5
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Fleets getting smaller .....
2
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Is zezo died???
8
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ZEZO for the Around Australia Race ?
2
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Pirates des Caraïbes 4
3
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Delays in downloading charts
4
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ZEZO and VRTOOL
5
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Race Benodet - Martinique
6
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Sailing inland?
3
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Winds dont match
21
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Velux problem
1
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Bateaux amis...
2
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Code Zero / Solent polars in Jules Verne
1
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where in the world is Cvetan?
6
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Weather in VR and Zezo don't match
3
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Velux Leg 3 Problem
5
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leg 3 velux 5 oceans
2
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The Game Barcelona World Race
4
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round the world record With Sodebo and Thomas Coville
1
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+6h Update
5
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Checksum
5
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Velux North-South puzzle
1
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Small polar difference on Velux Race
7
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60ºS border
2
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Velux 5 Oceans Charts
12
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Wind isn´t correct right now!?
25
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Is there presently a problem with wind speed & direction?
7
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Black dots ??
8
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Route du Rhum
29
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What is up with the VR Forum?
1
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Velux Five Oceans Race - 1st Leg
1
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border
is the game server working??
6
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is the game server working??
1
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border
website problem ?
4
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Velux 5 Oceans
3
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Polar Velux
8
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Velux and Route du rhum
14
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Welcome Back!
6
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The Velux 5 Oceans, ultimate solo challenge
4
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New forecasts of wind on VR
2
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Screen Dumps from the SevenStar RBIR
3
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Sevenstar RBIR
8
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Performance Graphs
7
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Real world sailing
5
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La Solitaire Du Figaro
36
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The most boring week-end of the year
1
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Winds VR Clipper don't match Sailing simulator? Or vica versa.
30
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Tour de France à la Voile
8
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Virtualregatta.com
2
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Incorrect wind cell data for 08000CET 8th June
2
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information needed
4
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Disappearing course lines.
3
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Liveskipper
4
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sailadvice boats without options vs+ prosails ( Clipper)
5
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window title
2
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Difference between SailZezo winds and VR winds
8
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Tabular output
5
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Heading South Africa
10
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End of leg 9, Clipper.
2
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End of the leg or the race
2
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Q: When is the forecast updated?
6
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Tour de France
18
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Course to Panama
3
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Friends boats
4
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Best TWA to windward
8
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A little question
2
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Holy Cvetan, be with us!
26
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Transat AG2R
28
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Wrong winds this morning...
10
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Clipper 5th Leg
9
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AG2R charts
11
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Hey Everyone I am New
1
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Wonderful Job
3
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stupid question
3
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Refreshing
2
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Clipper Polars
4
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Bugfix
5
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Angles SS Routes and MBRuler .... different ...?
10
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Resetting your position.
7
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correct wind?
12
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Wind update times
7
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Beunos Aires - Dakar
5
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Jules Verne Wind Speed
16
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Winds 05 Jan
6
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Prediction probability
2
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Great Site
2
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I like this website very much
2
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Red line
17
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Trophée Jules Verne
24
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The map east/west "non overlap"
8
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Clipper: Winds not in sync with VR
3
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Sail Names - Clipper Race
8
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Jules Verne Polars with stdsails in heavy winds
5
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VMC vs. VMG in teleportation.
49
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Only Green Flag and Wind Arrows on Chart
3
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shift start
3
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Clipper, 4th leg
8
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Important question
2
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Defining position
6
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Some questions
10
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Clipper, 3rd leg
15
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Info about the wind update reference...
3
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Transat 6,50
9
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Games clocks vs SS clock
5
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The Clipper 09-10 Round the World Yacht Race
12
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Real life edition
3
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Actual speed and Zezo???
8
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Funny....
3
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New Game Engine
27
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Can we make it in french ?
1
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Avoid tacks ...
6
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Clipper
11
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Big Bird already in UK ?
4
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How is the circle line calculated ?
5
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Instanbul Europa Leg 2
7
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Future races supported ?
8
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Got to love them
6
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Identification problem !
19
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Istanbul Europa Race
41
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La Solitaire du Figaro 2009
107
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pathtrack.appspot.com
5
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La Solitaire du Figaro 2009 - Leg 4
9
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Solitaire leg 3 - wind forecast
2
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New in Fastnet: Currents
4
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Predicted Tracks Duration ?
4
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Winds not coherent ?
3
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TDF Polars
6
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The Forum
21
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what happenned?
17
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Cvetan come back
4
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To boldly go where no-one has gone before
4
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8:00 20:00 winds
23
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Simulator for other games
6
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Sailing Simulator VS Sailplanner
3
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pathtrack.appspot.com
8
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problems with 2 boats
4
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LEG 10 - Stockhol /St Petersburg
6
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Route not taking account of the gate
2
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Oland Mark
1
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winds - issue
2
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Leg 9 preparations (and a trip to Sweden)
12
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Blue line ?
5
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Finish Circle
7
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border
Future Winds ???
4
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border
Wind Rectangles
9
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Rant(s)
9
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recalculation or stay with original cals?
4
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Zoom level
3
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The 'server'
8
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Comparison of Cartographical Accuracy
4
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Leg 8
5
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Navigating the English Chanel
2
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Donations?
3
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Red data window
3
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