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Posted by 76Trombones ![]() |
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I was playing with the transat data today (will post the grib). The polar that seemed to work well for the European races failed *massively*. Boosted downwind VMG speeds by almost 50% and the tracks snap into place. Insane! Boats go 32 kts average in a pretty wide range of conditions
![]() The Atlantic race gives at least a few good thresholds, as Race For Water was so close, but ended up losing days. |
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Posted by 76Trombones ![]() |
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Here's the Krys race weather. They sure lucked into a fast window!
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Posted by Tarco ![]() |
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Yoohoo !
![]() This new weather will be a relief ! I've been fighting against Leg2 for 2 days.... Either best VMG is around Twa 35/37° (which I had never seen before, I believe...) or there's a bug in the position reports and/or the NOAA's gribs... as this is a multihull, I was waiting for a flat polar, with a best VMG at 45 or more. So far, she looks more like a fighter jet than a sailboat... =-O Still not convinced about my results, but I'll let you know when I believe I'm close to something "workable"... ![]() As to the race, their average speed is around 30knts !!! That can't be only luck... ![]() |
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Posted by LaoziSailor (Han Tacoma-Emons) ![]() |
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Tarco, you following me...??
I really don't want to go further S. We'll see what happens, 2300kn to go, Christmats Morning might have a gift for us ![]() Han (aka Laozisailor) LaoziSailor
Everything gets done by not doing anything! |
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Posted by SlashV ![]() |
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I'll have a go at creating the polars as well and maybe we can compare or average later.
Will probably have some time during christmas ![]() Data and results will go here --- Last Edited by Jaap Versteegh at 2012-12-18 23:51:47 --- |
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Posted by Tarco ![]() |
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FANTASTIC !!!!
The new ocean grib file you made works on Ugrib, so I can check the wind when and where I need it , without dowloading 8 files per day, providing only the possibility to check exclusively the first minute of each.... Thank you very-very much !!! ![]() |
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Posted by Tarco ![]() |
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Hi,all !
Finishing the Ocean samples... More than 1000 of them... This time, they are extremely precise ! ![]() It seems Race for Water had a pb, as if they couldn't use their gennaker, or something like that. For every sample, their speed was 5 to 10 knts lower than the others in the same conditions. Oman probably had problems too : after they drifted south; their speed was never as high as the others'. Best VMG : around 165 between 16 and 20knts TWS !!! Max BS : 33 (averaged) Polar goes up and down, probably depending on the sail they use and if they can sail on one hull or not... Huge gap around TWA 100-105, below 10knts TWS. And another one at TWA 150, at TWS22 and above... More news when I'm done with Leg 1... again. I want to have the polar as complete as possible bafore I "publish" it. ![]() |
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Posted by SlashV ![]() |
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The track logs of the races I found contain position data that is already transformed to the addviso maps, it seems.
Does anybody know where to find lat,lon positions for the Krys and European tour races? |
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Posted by 76Trombones ![]() |
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Hey awesome! Anyone else want to join in as well? Impressively organised - "polar" opposite of my desk
![]() They're giving x/y coordinates with origin at upper left. For the Krys race, using a starting lon of 150.312 (map edge) seems to line up the data, though you end up with a funny multiplier (123.55). You normally expect to end up with nice clean numbers (120 makes sense) so I've probably messed up somewhere. For the y direction I get ~81N as origin and multiplier of ~167, which not only doesn't match the x scaling but also the bounds of the map. But it's something like that. The other xml file contains all the x/y values for the race waypoints and features. Which make figuring out the scaling easier as you have clearly defined points. (here's what I have so far - mostly featureless blob, but "races" pretty fairly against the real boats. Will be interesting to see how the different approaches compare!) --- Last Edited by 76Trombones at 2012-12-21 18:18:36 --- |
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Posted by SlashV ![]() |
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Ah thanks, was hoping I could avoid having to figure out the transformation from map coords to lat/lon, but since you did it as well I guess that's the way to go. Will do that then
![]() Thanks as well for your results so far. "Featureless" would not really surprise me for this kind of boat. I am not an expert, but the narrow hulls will likely have a boring resistance curve and at the speeds they do, they'll pretty much have just one sail configuration for any true wind angle: close-hauled ![]() ..as well as high lift/drag ratio's -> low angles of attack -> linear performance --- Last Edited by Jaap Versteegh at 2012-12-21 19:18:20 --- |
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