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Posted by JB ![]() |
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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. Fair winds to all. |
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Posted by kroppyer ![]() |
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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 --- |
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Posted by JB ![]() |
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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! Fair winds to all. |
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Posted by kroppyer ![]() |
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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. |
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Posted by JB ![]() |
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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. Fair winds to all. |
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Garagiste's Test Lab

Race #1928
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Patricks Test

Race #1932
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Joanne's Test Race Zone
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Marstrand to Cowes 2025

We invite you to another race, which will kick off the third quarter of our ARCH series. We'll set off from Marstrand, Sweden, which, along with Skagen, Denmark, marks the line commonly recognised as the border separating the Baltic Sea from the North Sea. The 650nm route will take our Ripitide 50 across the North Sea and the English Channel to Cowes, England. Watch out for the fast ferries crossing the Channel from Calais to Dover 😊.
Race #1935
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Nantucket Sprint 2025

Welcome to Nantucket, from whence Herman Melville’s Cap’n Ahab sailed round The Horn into the northern Pacific Ocean to hunt the gray whale - whose migrations are celebrated elsewhere in SOL’s Q4 schedule - he never to return. And whaling too, as the 19th C progressed, like Ahab disappeared from Nantucket as the harbour silted up and mainland Massachusetts whaling stations benefited from rail connections. But beach life, yachting and nostalgia has rescued the island from oblivion, so to celebrate leisure, SOL gives you the Nantucket Sprint - 25nm in 29er_XX’s from east of Tuckernuck Island across the sound to a finish just inside the mouth of the harbour. Enjoy!
Race 1936
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Puil's Practice Palaver
Nearly there; only 2500nm to go, round the Horn and up the Red Sea to Suez into what will more than likely be more headwinds for this sixth leg of our African circumnavigation, to be followed in September by a final sneaky dash up the canal back to where we started all those months ago. We’ll be sailing a not entirely appropriate-for-upwind-work 60ft Trimaran!
Race #1859
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Gulf of St Lawrence - test - Mirek
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Race starts: Apr 21st 17:00
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Stefan's Duck Pond

PRIZE: SMPF
Race #1900
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Trapped Camel
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Race starts: Aug 21st 15:03
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Caravanserai
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Race starts: Aug 08th 17:00
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Patrick's Playpen

Welcome to the legendary "Westcoaster," a race that has tested sailors for over 50 years. Spanning 435 nautical miles, this iconic journey takes racers from Melbourne, across the formidable Bass Strait, and around Tasmania's rugged west coast to the finish line in Hobart. Organized by the Ocean Racing Club of Victoria, the Westcoaster is renowned for its challenging conditions and adventurous spirit. This year, our SOLers will tackle the course in the swift and capable First 47.7, a yacht launched by Beneteau in 2000, built for speed and endurance in long ocean races. Get ready for an exhilarating ride in one of Australia’s most celebrated yacht races!
Race #1841
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Mirek's Mess & Canteen
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Race starts: Apr 26th 18:00
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Antarctica 1 of 3
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Race starts: Jan 27th 21:57
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Flinders Island TIMED Race 2024

Race #1776
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Tasman Double 2023 - Hobart to Sydney
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Race starts: Jan 02nd 02:00
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John's Test Zone
It's time to test your ocean racing skills in a variety of weathers as we head the 6400 NM between Hong Kong and Auckland in a fast Super Maxi 100. We'll be heading from a northern summer to a southern winter so keep plenty of cold weather gear and warm rum on board!
PRIZE: SMPF
Race #1597
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calm's Practice Race
Last raced in 2021, we return to Boston for another race to Newport. And just like in 2021, the chosen boat is once again the speedy R/P 66. This is a TIMED race so pick your winds wisely and see how quickly you can complete this 132nm run! For reference, the winning time in 2021 was 6:12:28.
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Race #1700
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ZONA DE PRUEBA DE MANUEL

Please note the displayed course is provisional; the actual course will be set after the IRL course is announced at the skipper's briefing 48 hours before the start, and no later than 24 hours before the start.
Race #1561
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San Sebastian to La Rochelle 2021
Once again, our SOL race will be shared with a group of Polish sailors, representing one of the stages of their Virtual Training Cruise around Europe. 171 nm in Delphia 47s across the not always calm Bay of Biscay from San Sebastian to La Rochelle will undoubtedly be one to test their skills. Welcome/Witajcie and we wish you all fair winds.
Race #1441
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Aland Sea TIMED Race
Norrtalje Segelsallskap, 70km NE of Stockholm was founded in 1920, and time was when the society’s season opened with a challenging offshore race from the club line off Flaten island at the mouth of the long and narrow Norrtaljeviken, out onto a triangular course around the Aland Sea, to finish at Simpnas slightly to the north on Bjorko island - some 78nm in total. A fine race that SOL, being from these parts, ran annually up until 2013. Last run in autumn 2018, we return here to race the course again in the form a TIMED RUN in spanking new Club Swan 50s.
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Race #1444
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Bimmer's Test Zone
What about a speedy X-362 380nm race in the waters off S America, just to blow cobwebs away!!
Race #1415
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Antarctica 3 of 3
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BLANK POLAR
Race starts: Feb 16th 00:00
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