Facebook

Login

Support Sailonline

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

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

Profile for JB



Name JB
Email Address
AvatarUsers avatar
Posts305
Board Signature
Sail Fair.
  • 2018 SYC rankings
    Board » Sailonline Yacht Club
    Good afternoon all.

    Probably I'm missing sometning but, I don't understand why my first seven 2018 40' Series results were discarded from my SYC results.

    Thank you.

    João/psail
    Sail Fair.
  • 40’ Series hiatus.
    Board » Sailonline Race Committee » Races
    Good morning all.

    I’ve read the SRC annual report about the 40’ Series and it’s sad to know this SOL championship won’t turn in 2019.
    I understand and also agree with SRC exposed arguments. Pity that a phew conditioned the remaining majority.

    One possible way for overcoming the main issue, if not, the only one - the boats overuse/abuse from some skippers - is to make the Series races with pre-fixed boats for all, turning the Series to a OD championship with #4 - #5 40 footers to be used.
    But you loose part of the game.

    Other suggestion, independently of the Series future format (OD or multiple choices), is to upgrade the Series with faster boats, instead of “artificially” downgrading the faster ones (notice: one was already available in the SOL marina for the 2018 Series).

    From my part I’ve trying since a while to bring the Melges 40 Polar but till now without success.
    So, if anyone out there can give an hand on this I’ll be very thankful.

    Thank you.

    João/psail
    Sail Fair.
  • Re: qtVlm thread
    Board » Technical Support
    Hi Philippe and all.
    Good afternoon.

    Well, the settings I’ve been using a long time (since they were available) are the same, so I don’t have any induced distortion on comparing results generated with different settings.

    Those settings have proved to give results in all kind of WFs and with different boat Polars, being also more relevant with the faster boats, as you easily understand and as per example I sent you recently.

    Correct, the lower the Time Step (TS) used for calculating the Isochrones, the bigger will be number of potential WPTs. That’s the price for getting precision.

    The first point you mention misses rationality.
    We all know that ANY GRIB file won’t be exactly what you are going to sail IRL. Under that argument - yours - I ask why do we make routings?

    I totally agree with your second point and part of the third. For that I can give you one plausible answer for people not using TS = 5 minutes: I takes a lot of time to get a result, not because is less precise.

    In relation to fourth point, previously I gave you a suggestion: bring back the old "cutter", which I now reiterate.

    If it doesn’t have anything to do with the used TS, what’s the problem for implementing it again?

    My Dear Friend have also
    a Merry Xmas

    João/psail
    Sail Fair.
  • Re: qtVlm thread
    Board » Technical Support
    In past years we saw a quick evolution not only on weather routing software but also on sidekicks aiding tools.
    One of the best weather routing programs used around the corner is qTVlm. Since the very first versions it has been upgraded in a good rhythm bringing also a plethora of innovations, sometimes using info and suggestions gathered from the community.

    Anyhow, one qT aspect that has been roller coasting is the Optimizing/Simplifying algorithm processes applied to the calculated routing WPTs.

    It is very simple to verify that in spite of using the “Optimum Simplify” process first, and "Optimize" after (applied only once or several times), normally we won’t get the best ETA - even before any trimming operation on the fixed calculated WPTs, the ones in “red” color generated around land/rocks/barriers and on the remaining "green" movable ones.

    The cause for this is identified. Is a direct consequence of the used decimating algorithm implemented in qT for the “Simplify”/ “Optimum” processes.

    In recent versions - 2018 - this issue was aggravated as the decimating operation during the “Simplify” process stopped being uniformly applied along the routed path, leaving us to the somehow paradox of having more remaining WPTs in the end of the route, precisely where the predictability of the WFs are worse, which is a contra sense.

    There are ways to overcome this issue but, again with another contra sense, as you have to spend more time rehabilitating an over decimated routed path by adding new WPTs.

    Every WPT over decimated is a less one degree of freedom in the generated curve, giving here the main reason for qT going in opposite direction of the optimum ETA.

    Sincerely hope that qT responsible persons take once for all this issue and, at least bring back the “old” decimating algorithm, the uniform “cutter”.

    João/psail
    Sail Fair.
  • Re: GGR race final position.
    Board » Sailonline Race Committee
    Good morning SRC and all,

    Thank you for your reply &
    Merry Xmas.

    João/psail

    Sail Fair.
  • GGR race final position.
    Board » Sailonline Race Committee
    Dear SRC and all,

    Good night.

    Only now saw the final leaderboard for this race and, as expected I've suffered a time penalty accordingly to the race rules.

    In fact, I've departed from Hobart before time - didn't respect the 90 minutes stopover. It's a fact.

    Anyhow, if you look to the attached pictures you'll understand better what happened and following actions from psail.

    After recognizing my mistake I immediately imposed a self-penalty, stopping the boat for more than 90 minutes.

    So the late SRC action doubles the previous token on due time, i.e., the self imposed penalty psail made.

    For the mentioned reasons I kindly ask SRC to review psail final race position.

    Thank you SRC.

    João/psail



    Sail Fair.
  • Re: qtVlm thread
    Board » Technical Support
    No such problem here, what version are you using on which platform?

    @João/psail what other problems ?
    Replied today to Philippe.
    Latter I'll give further details.

    João/psail
    Sail Fair.
  • Re: qtVlm thread
    Board » Technical Support
    Hi all.

    Andrew, if memory doesn't fail, the related problem came on the qT 5.8.2 version, hence the main reason for stop upgrading qT since 5.8.1 (there are other reasons).

    João/psail
    Sail Fair.
  • Cookson 50 Polar data
    Board » Technical Discussion
    Hi all.

    Some time without coming here.

    Let’s see if the SOL community can bring some help on this subject.
    Please, I need a Cookson 50 Polar.

    The ones (#4) published on the link:

    http://jieter.github.io/orc-data/site/

    are limited as they stop at TWS = 20 Kts.

    The other reference I’ve found to the Cookson 50 Polar was on

    https://www.duo.uio.no/bitstream/handle/10852/12589/master_nils.pdf?sequence=1

    but has a poor graphic representation.

    So, if you have or know a location where I can extract one, pls give info.

    Thank you.

    João/psail
    Sail Fair.
  • Re: qtVlm thread
    Board » Technical Support
    Viva Philippe

    Good morning.

    Thank you for info.
    Yes, it works as the former "B" command.

    Big Hug
    João/psail
    Sail Fair.

Races

Next Race: 00d 00h 00m


Current Races:

San Diego to Puerto Vallarta 2024

Set sail for adventure with Sailonline's third epic voyage, in collaboration with the San Diego Yacht Club! Prepare for the ultimate challenge: a 1000-nautical-mile race to Puerto Vallarta along the stunning Mexican Riviera. As the real fleet ventures forth, we'll be right beside them, guiding our Santa Cruz 70s toward the sun-soaked shores of Puerto Vallarta! Are you ready to join the excitement?!
Race #1784
INFO by brainaid.de
Santa Cruz 70 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Feb 24th 20:00 Registration Open!
▶ Flash
GO TO RACE

Buenos Aires to Punta del Este TIMED Race 2024

Hello Argentina! Hello Uruguay! We are back after fourteen years, on the brown waters of the Rio de la Plata to race from the shores of Buenos Aires to the beaches of Punta del Este. This is a TIMED race, so be sure to re-register using the link below after you have finished a run, so that you can be ready to go again if fairer winds present themselves!
RE-REGISTER HERE to race again after finishing a run.
Race #1783
INFO by brainaid.de
Carkeek 40 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
RANKING:
TRQ1 - TRCH - SUPSOL - SYC
RACE CLOSE: Saturday,
March 2 at 2300 UTC
Race starts: Feb 18th 12:00 Registration Open!
▶ Flash
GO TO RACE

Perth to Mombasa 2024


Embark on an exhilarating maritime odyssey - the second leg of the 2024 Ocean Race Championship. This daring expedition charts a 4500nm course from the shores of modern Perth to the historic port city of Mombasa. Braving the vastness of the Indian Ocean in our high-performance OPEN 60, this voyage promises to be not only a test of skill and strategy but an immersive experience in the untamed beauty of the world's oceans. Join us as we push the boundaries of seafaring prowess on this epic adventure, where every wave will tell a tale of determination and triumph.
PRIZE: SMPF
Race #1762
INFOby brainaid.de
Open 60 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ1 - OCCH - SUPSOL - SYC
RACE CLOSE: Thursday,
February 29 at 2300 UTC.
Race starts: Feb 05th 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member WRmirekd
  2. Sailonline Yacht Club Member Pit8008
  3. Sailonline Yacht Club Member FreyjaUSA
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member sassy63
  6. Sailonline Yacht Club Member Kipper1258
  7. Sailonline Yacht Club Member bonknhoot
  8. Sailonline Yacht Club Member wsguerin
  9. Sailonline Yacht Club Member CollegeFund
  10. Sailonline Yacht Club Member Vida_Maldita

View full list

Series

Mobile Client

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

The mobile client