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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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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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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