Post by iconPost by llamedos | 2010-01-02 | 16:03:17

Hi Cvetan,

New years greetings to you and your family.
I've noticed you have removed the Clipper heading from the charts, just wondering you going to continue supporting this race in time for the start tomorrow morning?
I hope so.

Regards llamedos

commenticon 8 Comments
Post by iconPost by zezo | 2010-01-02 | 19:50:04
Happy new year!

I haven't touched anything - should be still there ;-)

Will add the destination coordinates after the race starts.
Post by iconPost by llamedos | 2010-01-02 | 22:08:36

Whoops, sorry just me being thick again, didn't look properly, must have been too much excitement about sailing again.

Regards llamedos
Post by iconPost by pcayrol | 2010-01-04 | 00:03:47
Hello and Happy New Year,

I think that zezo et VRTool don't show correct boat speed compar to PACOTOOL (how is compliant with VR).

I'd like to know why ?

Wind : 17.28 Knots - 190°
Boat Heading : 330°
Boat Wind Angle : 140°
Boat Sail : LightSpi

Zezo and VRTOOL : 11.8
PACOTOOL : 11.61
VR : 11.6

An idea ?

Post by iconPost by pcayrol | 2010-01-04 | 19:15:09
Ho I think this problem has been seen already... It is the "crossover point stuff"...
Post by iconPost by zezo | 2010-01-04 | 20:21:00
Yes. Both the site and VRTool use a "perfect sail" polars with information which sail should be used at which speed, but that is broken at the crossover points. I think about writing polar 'compiler' that avoids that, but haven't done it yet.
Post by iconPost by BigHorn | 2010-01-13 | 18:30:58
Hi all, compiled polars files for VRTool can be downloaded from my site :
Post by iconPost by zezo | 2010-01-13 | 19:01:06
Thanks. I was thinking about that approach - table, containing all possible wind speeds in km/h and single lookup instead of linear interpolation during the optimization. It could even be a tiny bit faster that way.

P.S. Nice chart too. I will bookmark it for future use ;)
Post by iconPost by Vigilante | 2010-04-24 | 18:19:41
Many Thanks, Big Horn. I'm scrambling to recover my skill set from VORG days!
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