Post by iconPost by Frankfurt | 2010-03-10 | 23:00:21

Hi Cvetan,

quite often your tool suggests 40° TWA to windward, while VRTouToulz and PacoTool suggest 36° (for many wind speeds currently in Clipper / pro sails).

Where does the difference come from? I am quite sure that it is not a question of trajectory. Is it due to the limited angle resolution the tool is using?

Thanks for clarifying.

commenticon 7 Comments
Post by iconPost by zezo | 2010-03-10 | 23:29:31
36° gives the best VMG above 14 kt wind spped, but 40° is very close, so if you are not going directly upwind (VMC != VMG) the optimizer may see 36 better on port tack and 40 better on starboard (or vice versa)
Post by iconPost by Frankfurt | 2010-03-10 | 23:43:06
O.k. Let's consider wind coming from 0° and the desired course is 10°.

Your optimizer might than suggest 42° on starbord tack and -28° on port tack, if I understood you correctly.

PacoTool would probably suggest 60% (or the like) of the time with +36° and 40% with -36°. And that is what my own calculations suggest.

I agree that it is all very close, but as we all know, to win the game you need to be 1 mile better after 5000 miles. So details count.

And for the other folks: I donated again.
Post by iconPost by Frankfurt | 2010-03-14 | 13:34:35
I made the calculation complete new again, independent of the first calculation - and of course of Paco's calculation. It again supports Paco's recommendation.

I can give details or send the excel file with the calculation.
Post by iconPost by zezo | 2010-03-14 | 18:21:21
You have a point. I'll take a closer look tomorrow. There may be off by one error if it does this every time (but I'm not sure it does)
Post by iconPost by Frankfurt | 2010-05-02 | 18:15:51
O.k. Cvetan,

haven't seen you around the Forum for quite a while. I hope, you are doing well.

Here comes the ultimate answer: Paco is right.

The reason can be understood quite simply: If we are looking for the best course to +10°, we need optimum speed to north, 0°, and a certain amount of way to east. When beating, as we all agree, the way to east is easily achieved. The optimum way to north can be taken from the polars and is - in the example above - +/-36°.

Therefore, the quickest way to +10° is beating with + and -36°, the two alternatives in a suitable ratio to end up at +10°, i.e. a little more often +36° than -36°.

Every other tacking angle will be slower to north, and hence slower to +10°.
Post by iconPost by jaruska | 2010-03-21 | 17:32:01
Je serais très intéressé de recevoir ce fichier excel, travaillant sur un programme de routage moi aussi
jaruska.
Post by iconPost by pcayrol | 2010-05-04 | 09:00:55
I spend a long time on this issue... I'm happy that someone agree with me... ;-) It's just a question of geometry ! ;-)
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[Globe 40 (477)] TWA curve differs from navigation dots by about 5°
2
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Global 40 - new Class 40 polars
16
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Globe 40 on credits
4
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olympic race - which route to choose?
52
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Atlantic record bugg zezo Goto Lizard
3
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Figaro 3 Polars Winches
24
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Bit Sailor Router in RealSail
2
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Modification de destination
1
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Silent debugging
14
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How to manage buoys during absence
6
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Vela- route choosen by your mom
6
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VR Team ranking race criteria
1
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No news from Virtual Regatta about VOR (the ocean race).
1
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Log-in VR game marathon..
5
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VR Dashboard
5
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Dashboard - Precdicted Time ATLANTIC RECORD
1
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the prawn star
9
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polars virtual regatta
8
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how to convert Grib files to Grib2?
3
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VSR, XP points
7
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Predicted times
3
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Nord Stream *3*
11
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Game on 12Z, but Zezo still working with 06Z
3
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race wait points
1
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special boats?
7
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VR Dashboard in Firefox?
6
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ESCARGOT CLASS
11
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Los Angeles - Honolulu
26
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Rounding a Buoy
12
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VR Waypoint Heavy Bug Reporting
3
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Time of ending Jules Verne
4
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Shore detection by Zezo
2
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Nord Stream Race 2
7
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Trying to Break the VR Map Mistery !
3
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Navigating to "xxx.0" TWA
26
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Tara4 - no refresh
2
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Jules Verne: Inconsistency of headings and speeds, simulation !!
5
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VR, Zezo, Qtvlm card offsets
2
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Island's coordinates
34
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Tara Ocean 4
6
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Solo Maitre Coq
21
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Adjustable timeshift ?
3
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gate crossing question
7
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Expanded View on PC
3
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Panic at VR Nord
7
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Delays during the sail changes, or directions changes
3
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(Game wind = Zezo wind ) ⍯ (Grib winds = Windy.com)
7
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VR ending the ELO ranking.
34
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NMEA feed
128
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Dashboard Map Track Label not including the segment.tag
5
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VR ingame time
6
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VIRTUAL REGATTA and Phillip Ganier. Worst and worst every day...
7
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beta.realsail.net
2
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Escort Frigate
6
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Out of memory. If you are the developer of this content ....
17
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Question about GFS Grib
5
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RORC Caribbean 600
14
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sliding VSR
16
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Trying to use Zezo to select best combination of sails to select
7
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TARA OCEAN 3
9
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RORC Transatlantique Race
6
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Game appears stuck on 00Z weather from yesterday
4
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Sydney to Auckland
28
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Personal Message pages deleted
7
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New zezo fonction
2
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VR Ranking 2021
7
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Autosail malfunction
3
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Comments from a newbie to "long term" routing
1
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Massive thanks to Cvetan
7
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Fleet section mode record not working
2
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Possible routes on the Map tab
3
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Purple skippers on VR Dashboard
3
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UTC or CET time ?
2
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multiple routes?
2
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Real Sail
4
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Map a little gloomy
8
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Trophée Jules Verne - Route à l'envers ?
2
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Looks like weather updates offline for next 18h
26
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Bring the good old days back
7
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All.grib 0.0k ?
9
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different speed
3
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Strange 0.5 mille VR Scale
3
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Just an idea for a new feature...
7
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Connexion impossible
1
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Donations
7
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New leader - seems to be using Zezo
38
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Bravo Zezo
4
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zezo : Huge job - Huge thx
2
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Difference between boat speed display on VR, dashboard and polar curves
7
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Vendée Globe: Track lines falling too short of ischrones
8
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Tara Ocean
29
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VR winds currently not up to date ?
1
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"Sails Change" within the Programming
3
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RORC Transat finish moved to Antigua
3
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Weather update not appearing...
19
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