Post by iconPost by lucarc | 2020-11-29 | 13:31:54

Hello,

It seems that the polars from the game (thanks again toxxct for your polars) do not fit the polars form zezo when it comes to a TWA around 135° and a wind speed around 26Knts / 28Knts, making us use the C0 sail instead of the HG in the game, while zezo thinks it is otherwise.

I know this issue of little differences between zezo and the game is already known, I just wanted to notice you about this fact. For those sailing in the 40°S, you may lose close to a mile with 2 changes of sail really quickly if you do not pay attention.


commenticon 4 Comments
Post by iconPost by zezo | 2020-11-29 | 14:22:42
The indicated sail is not exact. It's defined statically within +/- 0.5 knots

The sails are equal at 135° between 26 and 27 knots. And above 27 the router should not select 135 because there is a dip in the polars.

Post by iconPost by lucarc | 2020-11-29 | 15:28:21
Okay, I got your point. I thought this was due to the polars from this link, which indicates HG to be the best sail at TWA 135 for winds slower than 27 Kts : http://zezo.org/vg/polars.html?opt=0

At TWA 135°, the transition between C0 and HG is set at 26,9 Kts with these polars, whereas it is 26,4 Kts in the game.

Thanks for answering though
Post by iconPost by zezo | 2020-11-29 | 15:47:21
26.9978 actually. That's 50 km/h. Leftover from the time the game polars were defined in km/h years ago. Best sail is still defined in terms of km/h

The router actually uses a 'composite sail' which is a single polar with indication of the best sail at certain speeds. But it only contains finite number of points (130)
Post by iconPost by toxcct | 2020-11-29 | 19:25:29
On my App though, each sail can be seen altogether on the same chart
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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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Dashboard not updating.
6
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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
1
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VR Dashboard
54
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Colone Tile red
3
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Destination setting - Fixer la destination
2
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Anyone else experiencing erratic course changing behavior?
9
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Looks like game winds not updating.
6
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difference between wind on he map and wind on the route
8
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Cape Horn route is not possible it is crossing land
6
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Lost the lines..
2
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all.grb question
3
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2 routings ?
1
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What point or line is being used to determine the rankings?
61
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180 degree bug and downwind track
11
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démarrer avec zezo au milieu de la course
2
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Local times in the charts
1
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red and green lines ahead of isochrones
13
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20 Minute tack
6
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nemo point challenge problem
8
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Nemo Point Challenge
51
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Point Nemoers
1
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Route doesn't give prediction over 24h anymore
7
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Iterations on server & Zezo
5
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Sidney-Hobart 2020
3
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To day zezo don’t give me any route
6
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Fatal Grib error tonight ?
2
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predicted times JV
3
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Loick Peyron uses zezo, the best virtual sailing router ;)
9
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Orthodromy vs loxodromy around the poles
6
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Strange 1st dot heading
3
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Campbell Island
4
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VR bugs and rants
11
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Cap constant, ou angle au vent ? Constant heading, or wind angle?
18
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Colors of wind in the chart
4
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Virtual Regatta API
2
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Compliment
12
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Cap Horn bug
3
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New forecast unavailable
32
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a boat and 2 races
7
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Red timestamp in Dashboard
16
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Game frozen @ 15:30 GMT?
6
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ice exclusion zone for VG
82
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La meilleur voile
4
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Ice limit changed
19
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Ice limit penalty
29
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Action table no more on the race page
3
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la flotte du VR n'apparait pas sur zezo sur mon Macbook alors que je me suis bien identifié, mais que le joue sur Ipad
2
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