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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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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