Facebook

Login

Support Sailonline

If you haven't already - join the SAILONLINE YACHT CLUB!

Please also consider making a donation - all amounts are greatly appreciated!

Board » Flag Officers » Race proposals » New TR and new SOL boat.

Page: Previous 1 2

Posted by
sol


Users avatar

Posts
297
Registered at
2008-08-14 11:08:14
2014-05-19 20:29:47 - Re: New TR and new SOL boat.
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.
Posted by
bonknhoot


Users avatar

Posts
106
Registered at
2013-08-06 21:35:15
2014-05-20 07:46:46 - Re: New TR and new SOL boat.
oops i see i was logged on as sol last night.
Clipping along
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2014-05-20 09:57:49 - Re: New TR and new SOL boat.
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.
Sail Fair.
Posted by
kroppyer


Users avatar

Posts
347
Registered at
2010-02-05 15:25:55
2014-08-21 18:55:05 - Re: New TR and new SOL boat.
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.
Attachments
Posted by
Karri


Users avatar

Posts
42
Registered at
2012-11-12 13:17:29
2014-08-22 16:01:43 - Re: New TR and new SOL boat.
Impressive guys, can't wait to get to sail this beast!
My opinions may have changed, but not the fact that I'm right.
Posted by
kroppyer


Users avatar

Posts
347
Registered at
2010-02-05 15:25:55
2014-08-23 09:15:29 - Re: New TR and new SOL boat.
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 ---
Attachments
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2014-08-25 17:15:14 - Re: New TR and new SOL boat.
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.
Sail Fair.
Posted by
kroppyer


Users avatar

Posts
347
Registered at
2010-02-05 15:25:55
2014-08-25 19:24:48 - Re: New TR and new SOL boat.
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.

Page: Previous 1 2

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Tall Ships Races 2025 - Le Havre to Dunkirk


Welcome to the first of four virtual Tall Ships Races in European waters which are concurrently being organized in-real-life by Sail Training International . The course for this first race is between the French ports of Le Havre and Dunkirk; circa 125nm in Sailonline’s magnificent 90m Barque.
NOTE: Starts and Finishes in tall ships racing are always offshore to avoid conflict with shipping and shipping lanes; online and real-life may not match exactly.
Race #1923
INFO by brainaid.de
Barque 90m PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TS - SYC
Race starts: Jul 07th 16:00 Registration Open!
▶ Flash
GO TO RACE

Red Eye - Key Lime Pie-gatta 2025

Opposite the Bahamas at the tip of the Florida peninsula, we find the Florida Keys, a honky-tonk arpeggio of islands, where another SOL classic, the Key Lime Pie-gatta, so-called after the famous local condensed-milk-based tart speciality, awaits to be navigated once again. We’ll race its “Red Eye” 180nm in very-American Santa Cruz 52s, ignoring such artefacts as bridges, causeways and piers joining the keys one to the other and to the mainland!
Race #1846
INFOby brainaid.de
Santa Cruz 52 PARTICULARS
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking: SYC - RED
Race starts: Jul 02nd 12:00 Registration Open!
▶ Flash
GO TO RACE

Sail Around Turkey 2025


Welcome to the 11th running of one of Sailonline's most iconic races, where our fleet races the length of the Turkish coastline from Hopa (the easternmost harbour on Turkey’s Black Sea coast) to Iskenderun (the easternmost harbour on Turkey’s Mediterranean coast). It’s a 1,372nm race and aboard our classic, 1st decade of the 21st Century, version 2 IMOCA 60, you should be able to get around the course in less than a week. That is if, of course, once you get out of the Black Sea you don’t stop to enjoy the sights or a BBQ or two in the Golden Horn, or on the Marble Islands, now land-locked Troy or Gallipoli or any of the myriad Aegean islands, that you shall have to carefully navigate past.
Race #1930
INFOfrom brainaid.de
IMOCA 60 v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Jun 27th 15:00 Registration Open!
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member CriticalHippo
  2. Sailonline Yacht Club Member KaSToR
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member FreyjaUSA
  5. Sailonline Yacht Club Member rafa
  6. Sailonline Yacht Club Member Kipper1258
  7. Sailonline Yacht Club Member rumskib
  8. Sailonline Yacht Club Member BRENTGRAY
  9. Sailonline Yacht Club Member Patrick70119
  10. Sailonline Yacht Club Member CollegeFund

View full list

Series

Mobile Client

SYC members have the benefit of access to our mobile/lightweight web client!

The mobile client