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Posted by NOR_Jawik  |
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No you are not. Fix course on Lat/Lon and no rumbline. I like it.
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Posted by BER_Baggus  |
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@Gilles & 76 - to be honest, the course is probably too short, only a few hours long. What I was after is what wind direction would be best for our polars. I'll see if I can all the GPS coordinates.
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Posted by 76Trombones  |
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It's a good exercise! It's not the same as ocean-racing routing, but the tools are similar. Even without shifts and predictors and gribs and such, just identifying favourable prevailing wind conditions is a useful trick.
Totally doable with a spreadsheet. To make life easier for such things it's helpful to fill the area between VMGs (and any other hollows) so that you don't need to worry about tacking. |
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Posted by BER_Baggus |
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It's totally doable with a spreadsheet, assuming someone has that spreadsheet......
The routing software is good, but it would only show you the optimum course for the forecast winds. I want too see what the best wind direction would be so that when, probably in 4 months time, it actually blows from that direction, we can make the best time. If that makes sense. |
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Posted by Smo  |
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Should be quite obvious on just cheking wx no need for routers more tricky to get crew there in right time. And good sailing makes it.
--- Last Edited by Smo Smo at 2011-04-15 06:05:01 --- |
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Posted by 76Trombones |
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I was going to show how to do this just with pen and paper, but here's an example spreadsheet. Change the leg angles and lengths. This is both clumsier and more complicated than necessary, but maybe can tell what is going on.
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Posted by A2  |
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I am quite interested in All pen & paper solutions to the various sailing conundrums that encompass navigational exercises.
Please show your work 
P.S. When I open the .xls file in NeoOffice I get get a series of #ADDIN? errors for the Spline computation in the field as well as the final Best TWD & Fastest Time --- Last Edited by Hubert Bonisseur at 2011-04-15 20:22:53 --- None so blind |
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Posted by 76Trombones |
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In words:
Convert your polar from knots to minutes/nm. For each leg, multiply the polar by the leg length and transfer to a plot using your dividers. The curve for each leg is added to the one preceding it. The resulting plot reads time, so your best TWD is the minimum. Here is the data used in the spreadsheet example - the fastest angle in 12kt wind is ~214 degrees. Course Leg 1 Leg 2 Leg 3 Leg 4 CC 0 45 270 130 NM 3 2 4 5 1/4 Ton 6 8 10 12 14 16 20 52 4.41 5.21 5.75 6.06 6.23 6.34 6.45 60 4.70 5.48 5.97 6.28 6.50 6.62 6.75 75 4.98 5.85 6.33 6.63 6.77 7.01 7.23 90 5.24 6.01 6.48 6.85 7.13 7.27 7.59 110 5.03 5.82 6.32 6.75 7.14 7.55 8.23 120 4.74 5.60 6.16 6.59 6.99 7.40 8.38 135 4.15 5.10 5.80 6.26 6.67 7.05 7.93 150 3.51 4.47 5.25 5.86 6.30 6.68 7.43 Bangle 43.4 42.0 40.4 40.9 40.0 39.3 39.4 BVMG 2.87 3.48 3.87 4.13 4.28 4.38 4.46 Rangle 146.6 152.9 161.6 167.0 172.9 174.7 175.2 RVMG 3.04 3.87 4.62 5.27 5.81 6.22 6.93 |
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Posted by 76Trombones |
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Yes the posted example uses a plugin for the interpolation functions and I don't think OpenOffice handles it correctly. Hmm... There's a cubic spline function posted at oooforum.org. Very much worth looking into for sailing spreadsheets. I used a second function to find the minimum, but there areother ways to do that. |
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Posted by Rod  |
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Duuuuh!!! Now I'm feeling stupid! I even taught coastal navigation for a while in the Navy but I do not have any idea what would be needed to get any info out of your spreadsheet. Hands up! How many SOLers know how to do this?
Sorry 76T, but its got to be simpler than that to help ME. If it breaks, it's not strong enough--if it doesn't, it's too heavy. |
Races
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Garagiste's Test Lab
Race #1939
INFOby brainaid.de
RC 44 Particulars
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RACE CLOSE: Saturday,
23 August at 23:00 UTC
Race starts: Aug 10th 12:00 Registration will open soon
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Patricks Test
Race #1932
INFO by brainaid.de
Young 88 PARTICULARS
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Joanne's Test Race Zone
Race #1847
INFOby brainaid.de
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Race starts: Jul 25th 12:00 Registration Closed
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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
INFO from brainaid.de
Riptide 50 PARTICULARS
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Race starts: Jul 21st 17:00 Registration Open!
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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
29er_XX PARTICULARS
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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
INFOby brainaid.de
60ft Trimaran PARTICULARS
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Gulf of St Lawrence - test - Mirek
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Race starts: Apr 21st 17:00
Registration Open!
Stefan's Duck Pond
PRIZE: SMPF
Race #1900
INFO by brainaid.de
Orange 125 PARTICULARS
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Ranking: OCQ3 - OCCH - SUPSOL - SYC
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Trapped Camel
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Race starts: Aug 21st 15:03
Registration Open!
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
First 47.7 PARTICULARS
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Mirek's Mess & Canteen
music deleted
Race starts: Apr 26th 18:00
Registration Closed
Antarctica 1 of 3
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Race starts: Jan 27th 21:57
Registration Open!
Flinders Island TIMED Race 2024
Race #1776
INFO by brainaid.de
Ocean 50 PARTICULARS
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Ranking:
TRQ1 - TRCH - SUPSOL - SYC
RACE CLOSE: Saturday,
27 January at 23:00 UTC
Race starts: Jan 14th 12:00 Registration Open!
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Tasman Double 2023 - Hobart to Sydney
music deleted
Race starts: Jan 02nd 02:00
Registration Open!
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
Super Maxi 100 PARTICULARS
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Race starts: Sep 01st 04:00
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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
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking:
TRQ3 - TRCH - SUPSOL - SYC
RACE CLOSE: Sunday, 18 August at 23:00 UTC
Race starts: Aug 05th 12:00
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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
INFOby brainaid.de
Young 88 PARTICULARS
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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
INFOby brainaid.de
Delphia 47 PARTICULARS
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Race starts: Mar 05th 17:00
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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
INFO by brainaid.de
Club Swan 50 Particulars
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RANKING:
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RACE CLOSE: Sunday, 28 February at 23:00 UTC
Race starts: Feb 15th 12:00
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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
INFOby brainaid.de
X-362 PARTICULARS
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ALT. CLIENT:Classic
Race starts: Dec 21st 16:00
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Antarctica 3 of 3
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Race starts: Sep 16th 11:13
Registration Closed
BLANK POLAR
Race starts: Feb 16th 00:00
Registration Open!
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