zezo polars vs VR polars
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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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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Problem with blue, red and green lines
13
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NMEA to Google Earth
23
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Dashboard 3.14.1 is reporting wrong TWD in NMEA
6
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DTL in Dashboard?
6
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Who is writing in zezo???
1
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lignes des glaces differentes ZEZO et VR
8
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Jibs speed penality
2
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Récupération de la position des bateaux (amis ou suivis) depuis ZEZO vers QtVlm
14
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Plus de données notée
3
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weird new behavior /!\
2
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Inconsistency btw green line and isochrone
2
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Mobile Apps Weather4VR and SailGrib4VR
12
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Basic game question
7
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No more wind indications?
8
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Coordinating timing start of route calculation with position
6
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Difference between Zezo gribs and zezo chart
3
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routing and boat speed
6
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Isochrones missing after 105°E
6
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GREAT Jean Le Cam - Viva Eric Escoffier!
4
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ZEA (Antarctic Explosion Zone) not up to date on the Dashboard
4
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Lignes noir / bleu / rouge ne s'affiche plus
3
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ICE LIGNE
13
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Problem on visual MAP on Dashboard 3.12.11
5
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CDN test #3
18
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zezo polars vs VR polars
5
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Nardin Watch challenge
3
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Little square in toggle tracks ?
3
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CDN test
6
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Data underline in red in dashboard
2
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Some changes - caching/CDN
11
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VR Dashboard Version 3.13.1
11
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Zone de glace
3
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Bugged buoy in the programmer turns the yacht at heading 0,0
13
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New VR failure mode
13
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10-minute between predicted Zezo TWS and actual game TWS
4
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New server for Zezo?
16
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When does the red exclusion line whill be extended?
5
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Are the polars static? Seems some creep since start.
11
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How to find best TWA for positions in the future - Question for beginner
6
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Starting now to use ZEZO
2
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algorithm current position and speed
7
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VR winds issue
24
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NMEA and AIS Yes ! but....
1
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Display forecast timestamp
2
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Server still down ? Server de nouveau au tapis ?
9
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manage several NMEA outputs with VR dashboard
4
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NMEA message format
12
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New Feature
3
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Foils
3
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VR Dashboard v3.12.10
31
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Toogle Tools
3
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Error Winds display
2
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flip-flop hours Grib confused following this morning's article
6
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