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!

Board » Flag Officers » Race proposals » A new race with a new boat.

Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2015-07-07 16:22:19 - A new race with a new boat.
The new race proposal: Bermuda TR/SPRT.

It’s a new race that can be run on TR mode or on SPRT one (TR - Timed Race; SPRT (Sprint).

After some wisdom words from Piero (thank you, again) I thought that #3 different race paths would give enough flexibility to choose, function of the prevailing winds, namely, the type of race to be run.

Pls load/see the attached files:

1 - “Bermuda Map with marks.JPG”;
2 - “Bermuda TR.kmz”.

The “KMZ” file type is to be opened with GoogleEarth.

Race configuration 1.
Turning Marks: BM1 to BM11.
Max. Distance: 47,6 nm.

Race configuration 2.
Turning Marks: BM1, BM3 to BM7, BM9 to BM11 (excluded BM2 and BM8).

Race configuration 3.
Turning Marks: BM1, BM3 to BM5, BM7, BM9 to BM11 (excluded BM2, BM6 and BM8).

The new proposed SOL boat.

Since Sydney Olympic games, where she was introduced the 49er is a little and vicious speed monster.

Pls load/see the attached file:

3 - “boat_49er.txt” (in qTVlm TWA/TWS column style).

Shall we have a try?
Up to you and our dear SOL committees to agree.

A Big Hug to all.


Sail Fair.
Attachments
Posted by
kroppyer


Users avatar

Posts
347
Registered at
2010-02-05 15:25:55
2015-07-07 17:59:04 - Re: A new race with a new boat.
The 49er polar you posted seems to be based on datapoints from only 3 angles (at various windspeeds): max VMG, min VMG and twa=90 (not counting twa=0 and twa=180). The (bi)linear interpolation is used to generate more datapoints. (Correct me if I'm wrong)

Could you share the original data, or remove the datapoints generated using (bi)linear interpolation. Sol's splining algorithm will probably do a better job estimating the boatspeeds between datapoints.

--- Last Edited by kroppyer at 2015-07-07 18:01:28 ---
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2015-07-07 18:17:11 - Re: A new race with a new boat.
Viva Huib.

Thank you for your comments.
The steps I took to extract and generate the 40er Polar data were basically as follows:

1 - Graphic data extraction from aprox. 1.500 points in #7 TWS curves;
2 - Data Outliers cleaning;
3 - Cubic spline interpolations (only) on the collected data points for the TWA/TWS qTVlm range, and two (only) hand adjustments.

I’ll send you a DropBox link with the relevant files for you (please see your e-mail) and wait in this chat for your further comments, please.

A Big Hug!
Sail Fair.
Posted by
kroppyer


Users avatar

Posts
347
Registered at
2010-02-05 15:25:55
2015-07-07 20:11:41 - Re: A new race with a new boat.
The graph from which you extracted about 1500 points seems to be based on about 21 points (not counting twa=0 and twa=180).

As sol aims to be realistic, I think we should check the reliability of the source before we present this polar as representing a 49er.
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2015-07-09 12:17:24 - Re: A new race with a new boat.
Viva Huib.

Clearing out some aspects by appearance order:

1 - The source for obtaining this new SOL boat Polar data - 49er - was already sent to you and, previously to SRC (e-mails);
2 - The options I’ve took for choosing a particular 49er Polar data were also explained (e-mail).
2 - If during your check you find/found out I’ve used an unreliable data source, let’s hear your fundaments, and please I’ll appreciate your help;
3 - None of the curves used for data points extraction are “VMG” ones (EXCEL file).
4 - Those particular curves were generated - only - after obtaining the original data points (EXCEL file).
5 - As I’ve explained previously, namely here, and reiterate in the present, the number of data points used for extracting the Polar weren’t “#21” but, aprox. #1.5000 data points from #7 different TWS curves (EXCEL file).
6 - The average number of TWA angles per TWS curve used was #106, not “#3” (EXCEL files).
7 - I didn’t use “linear interpolation” (EXCEL file).
8 - Exception made to #2 particular data points (hand corrections applied), every interpolation was made by means of cubic spline process (EXCEL file).

A Big Hug from
J.
Sail Fair.

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Africa by Sea - Swakopmund to Maputo 2025


Time again to continue our exploration of Africa by Sea, which now takes us around the tip of the continent at Cape Agulhas and up the coast of South Africa to Mozambique’s marvellous Maputo, where we should find good anchorage in the bend of the Rio Espirito Santo (Umbuluzi) once we’ve cleared the 60m high Maputo - Katembe suspension bridge. It’s 1900nm and we’ll be glad to be sailing our comfortable and sturdy Xp-55, as we will certainly experience more headwinds!
Race #1857
INFOby brainaid.de
Xp-55 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - ABC
Race starts: Jun 11th 17:00 Registration will open soon
▶ Flash
GO TO RACE

Isle of Wight RTI Sprint 2025


Welcome to the Isle of Wight in the British Isles. A past home to Queen Victoria and the foundation of the America's Cup when yacht racing became popular in the 1800's. This particular race was last raced on SOL in 2012 to follow Soler JuJu sailing around the island. We return, long overdue, to race our final Q2 sprint around the island.
Race 1918
INFO by brainaid.de
Ker 40 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
SPRQ2 - SPRCH - SUPSOL – SYC
Race starts: Jun 07th 09:00 Registration Open!
▶ Flash
GO TO RACE

Marquesas to Young Island 2025

The adventure continues as we launch this fourth leg of the RWW series, racing from Marquesas to Young Island in the Balleny Islands, a group of islands in the Southern Ocean only 62 nm from Antarctica. Get ready for a chilling new challenge as we set sail on the sixth leg of the 2025 Ocean Championship Series! A 4100nm journey of endurance, strategy, and pure sailing excitement. This leg will be pursued aboard the race machine RP66, pushing sailors to their limits. Do you have what it takes to conquer the Southern Ocean? Join us and put your skills to the ultimate test!
PRIZE: SMPF
Race #1909
INFO by brainaid.de
Raichel/Pugh 66 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ2 - RWW - OCCH - SUPSOL - SYC
Race starts: Jun 02nd 11:00 Registration Open!
▶ Flash
GO TO RACE

TuziTekwini TIMED Race 2025

Sailonline is delighted to have been invited to partner with the King Shaka Yacht Club (KSYC) of South Africa to bring a virtual version of the Tuzi Tekwini Ocean Raceto our online community.
The Tuzi Tekwini Ocean Race is a near 90 nautical mile race down the east coast of South Africa from the port of Richards Bay to the port of Durban. Achievable in a single day and seen by some as an easy mile-builder, the course is more tactical than some think and should not be underestimated. This iconic race promises to be an unforgettable experience for yachting enthusiasts.
Our online version of the race will be a TIMEDrace so you may RE-REGISTER HEREto try again after finishing a run. You will have 13 days and 11 hours to test your skill and decision making after the race opens.
Race #1916
INFOby brainaid.de
Sailonline’s virtual yacht for all your runs will be our much-loved Farr 38 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ2 - TRCH - SUPSOL - SYC
RACE CLOSE: Saturday,
14 June at 23:00 UTC
Race starts: Jun 01st 12:00 Registration Open!
▶ Flash
GO TO RACE

SoCal 300 2025


With this year's California Offshore Race Week already well under way, here now is your chance to participate virtually in SDYC's challenging 243nm (as the seagull flies) SoCal 300 from Santa Barbara to San Diego. With a wide and wild range of boats entered for the real race, whose progress we hope we will be able to follow on our own chart by linking to the YB tracker, virtual SOLers will have to dig deep to remain competitive in our trusty Santa Cruz 52s.
Race #1919
INFO by brainaid.de
Santa Cruz 52 PARTICULARS
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking: SYC
RACE CLOSE: Sunday,
June 8 at 2300 UTC.
Race starts: May 29th 20:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member WRmirekd
  2. Sailonline Yacht Club Member CriticalHippo
  3. Sailonline Yacht Club Member KaSToR
  4. Sailonline Yacht Club Member FreyjaUSA
  5. Sailonline Yacht Club Member Patrick70119
  6. Sailonline Yacht Club Member Kipper1258
  7. Sailonline Yacht Club Member rafa
  8. Sailonline Yacht Club Member rumskib
  9. Sailonline Yacht Club Member Smo
  10. Sailonline Yacht Club Member bonknhoot

View full list

Series

Mobile Client

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

The mobile client