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Posted by Rod  |
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,My own confusion came from the use of two different measurement systems used in the same table without any indication of what units were actually used. If the quantities had been labelled properly, some 400 people would, perhaps, have noticed, before the end of the race, that there were some inconsistencies in the "uprising" information. WhyNot noticed it first, AFTER finishing. If it breaks, it's not strong enough--if it doesn't, it's too heavy. |
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Posted by WhyNot  |
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I'm WhyNot Rod. For some reason, my name comes up and not "WhyNot"
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Posted by Rod |
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Ah! It was good that you noticed. I certainly didn't, until you stated that there was a problem.
It just illustrates how we all accept printed material as correct, and rarely check on these obvious things. I hope that this doesn't impact too seriously on the student-designer, but I think this problem should be pointed out. As an ex-educator, I know how important these things are in education. Are you also Arrabiata? I liked your Desk-Top. --- Last Edited by Rod at 2011-06-16 14:33:20 --- If it breaks, it's not strong enough--if it doesn't, it's too heavy. |
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Posted by WhyNot |
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Nope, Arrabbiata is my Sunwind RC. That name was already taken when I joined SOL
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Posted by 76Trombones  |
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You can (if you want) change your forum display name under "edit profile" over in the login box to the left.
There aren't any inconsistencies with the polars - the text data is the same format for all the boats and the images show the same thing. Uprising was always going to be a fast boat - the designer identified where gains could be made and took advantage of that. Even if you change the 4m/s curve she's still wins, although by a smaller margin. That's immaterial though; everyone knew up front that what you see is what we get. The glitch(es) in the polar(s) were introduced when the instructors ran the data provided by the student teams. You pay your money and you take your chances. The "design" of uprising is/was perfectly valid. The single-number handicaps I presented at the start of the race took into account *all* aspects of the IMSYC polars in the expected wind at that time. Like any system, the accuracy of the handicapping varies with weather. A system arrived early and gave a downwind boost to a few boats. Such is life. If someone has archived the race weather I'll be happy to run the numbers with our true wind. Unfortunately I wasn't around for most of this race. 76T |
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Posted by Rod |
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Do you know what program was used to develop the design into the set of polars? My interest is in trying to do the same things for my design of Footy RC boats. I used Prolines 7 to design the hull. but I don't know how to determine the polars & performance.
At a one foot length, I can design, build, and sail my own racing yacht---I somehow doubt if they would yet give me the opportunity to do the same for the America's Cup----!! If it breaks, it's not strong enough--if it doesn't, it's too heavy. |
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Posted by 76Trombones |
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Jakob has posted the lecture notes, homework assignments and necessary code for the "Sailing for Performance" course.
The main focus of the course was learning the physics of sailing and developing the VPP rather than the final design. Enough info is presented to duplicate the students' efforts and write your own VPP (in Matlab, but open-source Octave/Freemat should work, or any other language with some changes to the framework). The basic code is extensible - for small boats you'd want to (at least) change the aero/hydro data to reflect scale effects. Sailing for Performance There is also a VPP online at polardesigner.org with some familiar names attached  . Scale will limit it's use for models, but it's fun to play with, and no code required.
There are some free spreadsheet-based VPPs out there too: "pcsail" comes to mind. --------------- edited to shorten URL to fit in column --- Last Edited by RainbowChaser at 2011-06-16 21:45:23 --- |
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Posted by Rod |
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Thanks. I will try----but may get swamped!!! If it breaks, it's not strong enough--if it doesn't, it's too heavy. |
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Posted by A2  |
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Now that IMSYC 2011 has concluded can we revive your (76T's) 8 Metre Rule challenge using the aforementioned polardesigner.org ?
I have improved my boat & will race against all comers even if that means it is just 76T in a match race. Once the "Cup" has been Won it will have more value for future competitions. 8^) None so blind |
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Posted by Arthur  |
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Still waiting for a polar designer for more than 1 hull If you're still in control, you're not going fast enough. |
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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 😊.
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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
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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!
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Mirek's Mess & Canteen
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Antarctica 1 of 3
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Flinders Island TIMED Race 2024
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Tasman Double 2023 - Hobart to Sydney
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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!
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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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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.
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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.
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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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Bimmer's Test Zone
What about a speedy X-362 380nm race in the waters off S America, just to blow cobwebs away!!
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