Question on Road Zezo : TWS color for foil
Post by iconPost by Benoit | 2018-12-20 | 09:07:15

Hy
For the Sydney-Hobart, the parameter Foils is :
foil:{"speedRatio":1.04
twaMin:80
twaMax:160
twaMerge:10
twsMin:16
twsMax:35
twsMerge:5}

The speed parameter Foils is :
twsMin:16 & twsMax:35
But in the table “Route Rezo”, cells paint in black do not correspond has these speeds (column TWS)

And that mean the parameters twaMerge and twsMerge?


commenticon 4 Comments
Post by iconPost by zezo | 2018-12-20 | 09:31:44
The foils don't kick in at once. They start working gradually 5 degrees/knots outside the min/max - that's the Merge parameter.

That's why you see foils at 12.x knots. It's a linear interpolation, so at 12.5 knots you only have a ratio of 0.004, 0.02 at 14.5 and so on.
Post by iconPost by Benoit | 2018-12-20 | 10:49:22
Ok, thank's
et vive les mathématique !
Post by iconPost by GeGaX | 2018-12-20 | 18:23:39
The foils are active from TWS 11.1 to 39.9 kts with TWA from 71 to 169 °.

If the cells are dark on route zezo.org, they only show that the use of foils is possible.
Post by iconPost by toxcct | 2018-12-20 | 19:42:53
Sinon, tout cela est illustré et visible graphiquement sur mon application de visualisation des polaires :

http://toxcct.free.fr/polars/

1) choisissez la bonne course
2) sélectionnez les options et les voiles avec lesquelles vous avez équipé votre bateau
3) cochez la case "Display foils activation range" à droite de la coche des foils.
4) jouez avec la vitesse du vent (TWS) pour voir l'arc orangé varier. Plus il est foncé et plus les foils sont performants...
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