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Posted by sol  |
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Hoi Kroppyer. The idea behind the high wind speed performance curves is that you should not be out in those winds in your AC72 at all at all. But if you are, then above 40 knots everything stops. Crash, boom, wallop, carbon fibre round your ears. The curves were made using relatively few data points. Below 26 knots they were the ones Joao found the jury used to determine penalties. Above 28 knots they were simply ones I made up to model a dramatic decrease in performance. The interpolation algorithm filled in all the intermediate points, and, indeed, I may have noticed that at high speed some of these went slightly negative when the algorithm tried to model fair curves. On Sunday I thought about fiddling the numbers further, but then said to myself 'so what; the main thing is that at high wind speed you spin out like Lewis Hamilton'.
PS I kind-a-knew the performance loss rule wasn't something to be altered on a whim, but Joao had done some honest research and he is right to feel strongly about its inadequacies for VHP machines. So we left his thoughts intact. |
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Posted by Yohann Voileur  |
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oops i see i was logged on as sol last night. Clipping along |
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Posted by JB  |
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Viva Kroppy.
Thank again for your comments, always so pertinent. In theory (and practice) the BS you read from a boat Polar Data has to be equal or bigger than the value zero. So, there’s no sense in having a BS slower than zero knots. Yesterday, Jan gave here a detailed explanation for having those odd values (the negative ones) on the AC72 SOL boat Polar Data we prepared. We should consider those negative values for the BS as plain zero. Being a non-exclusivity for this particular boat, one of the things this AC72 SOL boat will corroborate (again), is the inadequacy of the actual SOL Performance Loss function. In this case, it just stretches it. One can argue that, if it’s working, even it’s wrong, it shouldn’t be fixed. I would say: it’s working, it’s wrong and, can/should be improved. Otherwise, I wouldn’t be here. My idea for this debate is very clear and simple, almost in tune with yours, Kroppy. Boat mass, boat speed and turning rate should enter the equation for finding a new SOL Performance Loss function that fit’s closer to sailing reality. I was working on it. Fair winds to all. |
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Posted by kroppyer  |
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AC72 polar in some standardized format. Some programs should be able to open this. Hopefully this makes it a bit easier to convert it into something the sol-server understands.
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Posted by Karri  |
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Impressive guys, can't wait to get to sail this beast! My opinions may have changed, but not the fact that I'm right. |
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Posted by kroppyer |
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Hurray! hmm put the new polar on the server!
polar as in client AC72 vs Orange 125ft Cat --- Last Edited by kroppyer at 2014-08-23 09:21:30 --- |
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Posted by JB |
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Viva Huib.
Just a small note on your AC72 Polar data txt file. Please have a look on the columns for TWS above 42 kts. Big Hug from here. Fair winds to all. |
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Posted by kroppyer |
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There are no columns for TWS above 42 kts. I believe SOL server extrapolates so that the boatspeed for TWS outside the range remains constant. In this case, boatspeed will remain 0kts above 42kts.
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Garagiste's Test Lab
Race #1939
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RC 44 Particulars
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Patricks Test
Race #1932
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Joanne's Test Race Zone
Race #1847
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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
INFO by brainaid.de
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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
INFO by brainaid.de
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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
INFO by brainaid.de
Ocean 50 PARTICULARS
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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
INFOby brainaid.de
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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.
RE-REGISTER HERE to race again after finishing a run
Race #1700
INFO by brainaid.de
R/P 66 PARTICULARS
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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.
RE-REGISTER HERE to race again after finishing a run.
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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X-362 PARTICULARS
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Antarctica 3 of 3
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Race starts: Sep 16th 11:13
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BLANK POLAR
Race starts: Feb 16th 00:00
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