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Posted by 76Trombones  |
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There have been rumblings about upgrading our Volvo now that the next generation of boats are starting to appear.
Still quite a few cards being held back, but we have some preliminary data for Puma, Groupama and Camper with more to come in August. I'm happy to do the final crunching, but in the meantime it would be great if we could set some of SOL's collective enthusiasm to the task of ferreting out relevant info: •Anecdotal data •Data points from pics showing instruments •Pics showing the nav station with the routing running (haha right, but sometimes they're sloppy) •The big one is to parse the tracker data. Either scroll manually picking off as many data points as possible into a spreadsheet, or trickier methods. There's not much point in trying to figure reaching speeds using this method, but scatter-plotting BS vs TWS for up and downwind conditions gives us a pretty decent overall evaluation. Tacking and gybe angles are also there (if you squint)... We have 3 months! Post away |
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Posted by RainbowChaser  |
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76T - it would be fab to have an upgraded boat before the next ocean race.. as you say.. we have three months!!
Let's hope everyone starts data-gathering!!! |
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Posted by Sebensa  |
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have been trying to ferret, with no results of any thing worthwile - will keep trying
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Posted by 76Trombones |
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Raw data from the first two legs superimposed on our existing polar.
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Posted by NZL_PaulR  |
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The close hauled 40 to 70 TWA range looks reasonably close to the polar, but in the spinnaker 120to 140 range there is not as consistent agreement. This is all at first glance without any detailed comparision. My first questions is to ponder how much the sea state or tides/currents could have affected the actual results? Perhaps this is impossible to know or analyise and adjust for.
Still it is a very interesting comparision. Well done & Thanks. If it breaks, it's not strong enough! |
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Posted by AGage  |
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Very interesting 76...
Paul - I would imagine that with enough data sea-state etc could be eliminated. I mean, if we had 200 data points for sailing at TWA X in TWS Y, there should be enough different sea-states and currents etc that they average out? Perhaps I am wrong though. Certainly some sea-state would be consistent, ie you usually have waves from behind when sailing downwind, and off the bow upwind. But that would be something we should include in our performance data? (as we don't have waves themselves in SOL) What should even out is the size of the waves. Sometimes they will be large and add a lot to the SOG - other times they will be much smaller (for the same wind) and contribute less. Seems to me inport data would help with this? I help develop the client interface for the best online ocean racing sim there is... __/)/)_/)__ |
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Posted by NZL_PaulR |
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Aaron: I believe this is a simple summary.
"In theory there is no difference between theory and practice, but in practice there is." So yes, lots more data could help, but eventually "paralysis by analysis" will occur. The Nexus Server & software can produce polars for you after some sailing. I'm sure other systems can as well, but I have not seen or done this myself. SOTP and looking outside the boat works for me, but a improving performance using a lot of effort and heaps of money would help!!. Still I do appreciate 76T's work and thanks for showing the data. If it breaks, it's not strong enough! |
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Posted by NZL_PaulR |
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However the sea states "average out", most of us are seeking excellence in sailing, not just an "average" performance, rather like sex really. LOL!! If it breaks, it's not strong enough! |
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Posted by 76Trombones |
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The data represents some 600 hours of sailing spread over 6 weeks and averaged over 1 hour periods (and 6, well 5... maybe 4
 different boats), so it's a pretty good snapshot of average performance.
The "average" performance is a moving target, but it's what should feed your navigation decisions (always looking out the companionway as well). There'll be another (dozen?) sets of data that are used as performance targets to put the spurs to the crew, adjust for extreme weather nastiness etc. Though sometimes you wonder... From Ken Read: “All of our routing software on board gave us an illusion that we could punch through that front,’’ Whenever statistics come up in sports (life, business etc) decision-making there's an argument that says that setting strategy based on anticipated performance is aiming for mediocre results. I don't buy it, but I think it's probably the way different people are wired - probably whole branches of psychology... I'd never say to my tiny pink crew that "we only need to hit 90% of our perf targets to make the critical move", but I'd likewise not make critical decision based on achieving 110%. In SOL, where 100% boatspeed is a given, I still try to allow room for error/fatigue/luck. Routing (or SOTP) can sometimes give you the idea that you can do things that are pretty improbable. Balancing the improbable and the impossible is a good chunk of the fun (and like swing-for-the-fences irl strategy, GREAT fun when it pays off). ANYways My take on the data vs our polar is that a) we're pretty close! We mostly knew that already, but cool to see. b) There are a few sail transitions that we could work into the polar to give us some more gears to play with (usual suspects close reaching and 110-130 depending on TWS)
We're much too fast in some conditions, but have to balance against sailing gribs vs IRL and the way SOL handles weather, especially for ocean races. |
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Race #1939
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Patricks Test
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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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Stefan's Duck Pond
PRIZE: SMPF
Race #1900
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Trapped Camel
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Caravanserai
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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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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
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