Post by iconPost by Cags | 2011-11-19 | 13:44:46

I am maximising my VMG to a mark using 'boatSpeed*COS(angleToMark)'.
However, when the mark is inside the tacking angles but not directly upwind, the optimum VMG to the wind and the optimum VMG to the mark will be different. In a race, we always sail to the wind and spend longer on one tack. My question is, what are the limitations to the cosine formula and is there a better optimisation routine?
I understand the SS optimises by minimising the distance to the mark over all possible routes.

commenticon 2 Comments
Post by iconPost by Cags | 2011-11-19 | 13:47:06
Forgot to say, great site, wonderful concept and powerful engine. I rarely get impressed but I certainly am now. Thanks and keep up the good work.
Cags
Post by iconPost by zezo | 2011-11-19 | 14:54:56
One of the reasons to sail towards the mark first during the race is that in real life the conditions change and in a possible wind shift you can be in worse situation if you take the other tack first.

That does not matter when winds are known and fixed in advance. But you could always apply your practical knowledge to the suggested strategy - it will work well for the longer tracks.
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VIRTUAL REGATTA and Phillip Ganier. Worst and worst every day...
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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...
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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...
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Dashboard not updating.
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Boats Skins Vendée Globe
3
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Safari on iOS: Bearing lines gone
3
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Wrong coordinates in zezo
2
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Winds in the chart do not show changes between 78 hours and 114 hours forecast
2
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Decoding of All grib
6
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I CANNOT ENTER FOR 3 HOURS IN THE GAME
23
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Why the vc data is yellow underlined ?
3
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Jules Verne 2020 - "Start NOW" discrepancy VS real time
7
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Would like to know the reasenable time to update your pisition on zezo
16
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Arrival Vendée Globe in Normandy !!?
4
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MIssing the Obvious: How to get Zezo routes back into VR
2
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VG 2020-01-02 has Zezo a problem with geographic or ...
8
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How to retrieve a waypoint (TWA/HDG) that already passed...
16
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Track duration window
3
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Ways to bypass the client to give orders?
6
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Problem to Load zero route in windy.com
40
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French tutorial for zezo
4
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boat positioning
2
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Export routes in GPX format ?
4
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Sail selection issue ?
11
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Your friends boats in Google Earth
2
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Delay in Wind update ?N
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VR Dashboard
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