Support Sailonline

If you haven't already - join the SAILONLINE YACHT CLUB!

Please also consider making a donation - all amounts are greatly appreciated!

Board » General Discussion » MOD70 polar development

Page: 1 2 3 4 Next

Tarco has started working on a MOD70 polar, and I promised archive weather for the race(s) of the "European Tour" held in Sept. Tracking for the 5 races is available at europeantour.addviso.com/carte/carte1.swf if you substitute the desired race for the 1 in carte1.

If anyone else wants to take a stab at building a polar from scratch, please join in/help out! Once we get close we can race the new polar in routing to fine tune, and then hopefully race against the real boats in SOL next year.

--- Last Edited by 76Trombones at 2012-12-06 14:34:46 ---
Starting points - for leg 1, our current fleet was slower by:

OPEN60 40.1%
VO70 20.9%
ORMA 11.4%
Orange 17.6%
SuperMaxi 15.4%

These things are a lot faster close reaching than anything we sail!
Thank you, 76T !
I've finally managed to get the data on ExpeditionLT and BWR.
I still have to work the settings, I guess... and to understand all the functions...
That's fun, but it will be veeery long... I only hope I won't be late. The next official MOD70 race is in june 2013... :-)
Tarco, I can't get that file to work (fully) in most of my "normal" software. I couldn't find any simple ways to covert the data to a form that most can use, but I'm going to write a tool to do it properly... Give me a few days ;-)
Great !
I'm still struggling to understand the BWR tutorials... and wondering if I shouldn't reinstall wind-doze on the laptop... can't count the number of error messages I get on startup. Might be a reason why BWR doesn't run as expected sometimes...
Maybe you could just tell me the exact URL where you find the grib files. I'll work the races in slices... as soon as I can work anything... :-)
Anyway, this idea of a grib maker is great ! I couldn't have thought about it, as this is far beyond my possibilities... :-)
As you've guessed, you can take your time to create the tool... :-D
This leg should be interesting too. http://krysoceanrace.addviso.com/carte/
This was the first MOD70 race ever. It took them 5 days to cross the Atlantic... 1 day less than expected. ;-)

I think I can find the winds in Nomads for this period... I should then be ready to start calculations by this evening. :-D
Hi, 76T !
I've made a polar running on BWR and compared it to OPEN_60 with Brainaid's GRIB around England/Ireland.
From Edinburgh to Islay, the result is : 3d15h on OPEN60, 2d17h on the draft MOD70.
This seems to be a good beginning but still a bit slow, I'm afraid. I would like to compare it to the other boats you tried last week.

As I'm a newbie on BWR, I don't have any polar archives, so I miss the ones you mentioned. Please, could you post them for me ?
I mean VO70, ORMA60, Orange and SuperMaxi for BWR.

Anyway, I believe the ultimate trick will be to work on the KrysOcean and EuroTour trackers. I've tried to understand how to work on grib archives... change grib2 into grib1, then concatenate... with no result at all.
Still far beyond my understanding... I'm not used to console commands, or such spells and charms... :-)
Attached is another version of that grib. BWR still doesn't seem to like it much, but it loads and routes.

Requested polars (in bwr format) as well as a "blank" polar which I find to be a useful starting point as it contains a minimum number of points. Can be easily edited to get close, and then refined with more points if desired.

If the grib works, I'll do the Atlantic and also repackage the individual legs as smaller files - should speed things up quite a bit.
Oops... and Orange. :-)
Thank you, 76T !
I've begun to take speed/TWA samples from EuropeTour leg 1. Using Zygrib to read NOAA's grib1s and the tracker for the positions.

It will probably take me a few days per leg, but the polar should be better afterwards....
So far, in BWR, the results are close to what you found in comparision with the other boats, but the track is a complete mess compared to the IRL race.... so I guess the polar is false... :-)

Page: 1 2 3 4 Next

Please login to post a reply.


Next Race: 00d 00h 00m

Current Races:

Two Oceans Doublecross 2020
This race was first designed for Sailonline in 2010 by SOLer Jawz, and now, ten years on, we again invite you to sail our Fox 9.50s the 185nm around Cape Point and twice over the imaginary line demarcating the meeting of the Atlantic and Indian Oceans. Count the number of wrecks of previous vessels both old and new that underestimated the fury of the Cape of Storms! Celebrate your survival at the Tavern of the Seas.
Race #1403
INFO by brainaid.de
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Oct 29th 16:00 Registration Open!
HTML5 Client (beta) GO TO RACE

The Odyssey 2020 - Leg 2
Welcome back to the second leg of Sailonline's Virtual Odyssey which takes us from Cape Maleas at the south eastern tip of the Peloponnese across the Mediterranean to the land of the drug-dependent Lotus Eaters, probably Djerba on the Tunisian coast, where Odysseus nearly tarries too long, but gets away in time, only to end up on the southern coast of Sicily near present-day Sciacca, where a one-eyed cyclops named Polyphemus holds terrible sway and has to be dealt with after he has devoured a number of the crew. 850nm of epic adventure; enjoy!
Race #1389
INFOby brainaid.de
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - ODY
ALT. CLIENT: Classic
Race starts: Oct 27th 16:00 Registration Open!
HTML5 Client (beta) GO TO RACE

Sailonline's South China Sea Classic 2020
Welcome to the South China Sea and a fun downwind course of 366nm in TP52s from Lantau Island, Hong Kong to the island of Hainan in southern China.
Race #1402
INFO by brainaid.de
WX Updates:
0430 / 1030 / 1630 / 2230
ALT. CLIENT: Classic
RACE CLOSE: Thursday, 29 October at 2300utc
Race starts: Oct 23rd 03:15 Registration Closed
HTML5 Client (beta) GO TO RACE

Uruguay to Cascais - 2020 RTW - Leg 4
The last leg of Sailonline's Round the World Race 2020 takes racers from Punta del Este, deep in the South Atlantic, to Portugal's Cascais on the North Atlantic seaboard. More than 5000nm of almost only open water, bar three easily avoidable, well-known island groups and Fernando de Noronha and Madeira, in our much-loved Orange 125ft catamaran for your leisurely enjoyment of only wind, wind and wind and maybe some wine, chat and cheese!
Race #1399
INFO from brainaid.de
Orange 125ft Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ4 - OCCH - SUPSOL - SYC - RTW20
RACE CLOSE: Thursday,
October 29 at 2300 UTC.
Race starts: Oct 02nd 20:00 Registration Closed
HTML5 Client (beta) GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member bonknhoot
  2. Sailonline Yacht Club Member Kipper1258
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member knockando60
  5. Sailonline Yacht Club Member rafa
  6. Sailonline Yacht Club Member calmxy
  7. Sailonline Yacht Club Member NagaJolokia
  8. Sailonline Yacht Club Member batatabh
  9. Sailonline Yacht Club Member sassy63
  10. Sailonline Yacht Club Member nacrr

View full list


Mobile Client

SYC members have the benefit of access to our mobile/lightweight web client!

The mobile client