Post by iconPost by alexpanzeri | 2020-11-09 | 20:11:43

Good Evening Team,

one of our lady member of the Team has notice a strange value of the polar on IMOCA60 (both foiling and not):
- from 12 to 13[kts] of Wind speed and upwind, the boast speed decreases, while VMG increase, and after passed the range the boat speed is back to rise proportionally with wind. is it a glitch ? a table mistake? an aerodynamic effect of the IMOCA?

- checking this, I noticed also that the Jib is never selected in any range if full pack is on, even at Wv=15[kts] angle around 40-50° it remain in the LJ light Jib, is it a UI problem? IMOCA feature?

May these two affect the calculation?

Thank a lot again,
Alex p.

commenticon 4 Comments
Post by iconPost by zezo | 2020-11-09 | 20:32:20
Interesting observation.

That could be based on reality. If using the same sail (Genoa/Jib, whatever) there comes a point where the drag overcomes lift, heel angle gets worse and performance drops. Then you reef your main and change headsails.

Something similar happens above 30 knots. In the real world boat performance suffers because it's not only the wind. The wind generates waves. The risk of breaking something becomes higher. You have to wind down a bit.
Post by iconPost by alexpanzeri | 2020-11-10 | 09:12:46
Thanks a lot,
so it's just weird fluid/aerodynamic reality that I have learned at university :-)))

Post by iconPost by BooBill | 2020-11-09 | 22:05:01
It's actually from 12knts to 13.8knts. Both speed and VMG decrease, while wind speed increases. Above, I thought the observation was that VMG increased, while boat speed decreased. At constant TWA, that would defy Euclidian geometry.

I like Cvetan's explanation. Induced drag.
Post by iconPost by toxcct | 2020-11-10 | 00:19:28
Ah ah, I got a direct email about that exact observation.
Glad you guys come with the same kind of replies after all :)

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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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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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