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 » General Discussion » Jubilant Fastnet Campaign Qualifying Races - POLAR needed

Page: Previous 1 2

Posted by
NZL_Scotsman


Users avatar

Posts
251
Registered at
2008-10-04 07:59:40
2013-04-24 07:07:25 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
I would think you are faster under small spinnaker or gulling than with a genny in heavy conditions. Therefore the first one.


--- Last Edited by NZL Scotsman at 2013-04-24 07:08:20 ---
Posted by
javakeda


Users avatar

Posts
73
Registered at
2013-03-01 03:18:22
2013-04-25 15:45:57 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
Initial thoughts:
[Forgive me it I state the obvious.]

1) Having different polars for different sail configurations [and/or weather conditions] is fairly common for IRL routing. So the choice between 'a" and 'b' is not absolute.

2) Shape is more important than scale. It is a lot easier to scale a shape than vice versa.

3) In SOL we get used to having detailed polar values for every TWA degree and TWS nm.
IRL, it may be more constructive to think in terms of Points of Sail.

I would test values for being on a:
-- beat
-- close reach
-- beam reach [TWA = 90, NOT AWA = 90]
-- broad reach
-- run [tacking downwind]
-- DDW [wing and wing]
with particular attention to finding "maxVMG" points for the
-- upwind sweet-spot
-- downwind sweet-spot.
[Helmsman needs to make the call here. Mark the time when the helmsman is happy. Use post-sail log analysis to determine values. Feedback corrections can apply to the polar, the helmsman, or both ... but it is normally easier to correct the polar, and make the helmsman aware of the change.]

4) For empirical polars, it is a whole lot easier to think in terms of a sparse polar that is wind-line based ... as opposed to one that has values for almost any wind angle and wind speed. I would try for a sparse polar first [like the one for the J30 attached] and let software fill in the details later.
Certainly a sparse polar is easier to revise.

Again, these are just initial thoughts based on my experience in validating the polar for a Beneteau First 47.7 [cruising rig].



--- Last Edited by javakeda at 2013-04-25 15:51:08 ---

--- Last Edited by javakeda at 2013-04-26 15:27:51 ---

--- Last Edited by javakeda at 2013-04-26 15:28:35 ---
Attachments
Posted by
ALL_4_Aaron


Users avatar

Posts
5
Registered at
2012-09-22 11:10:08
2013-04-26 15:04:06 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
quote: Feedback corrections can apply to the polar, the helmsman, or both ... but it is normally easier to correct the polar, and make the helmsman aware of the change.]

LOL
Posted by
ybw_mjm


Users avatar

Posts
20
Registered at
2009-11-12 21:48:35
2013-04-26 17:15:10 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
After having sailed the Moody s38 for a number of years, the _b polar is looking like a good match in terms of shape and speed.
My only comment is that since we are a little heavier we might need a little more wind to get us going.
Virtual sailors might do better than us in real life if the winds are light.
We will record our speed/wind data in real life and see then what improvements can be made.
Posted by
RainbowChaser


Users avatar

Posts
2656
Registered at
2009-06-14 09:44:50
2013-04-26 17:49:39 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
mjm - OKies Jubilant_b it shall be.

In reality you will have the benefit of tide? or current? so maybe the fact that SOLers will grab the wind swifter will be offset a little?

:-)
Posted by
ybw_mjm


Users avatar

Posts
20
Registered at
2009-11-12 21:48:35
2013-04-27 00:36:03 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
Tide.. Good thinking..
Although I think in the first race (4th May) we will be against a weak tide IRL for the first hour or so...then crossing the English Channel, the tide will be across our course.. so it should all even out in the end.
Posted by
ybw_mjm


Users avatar

Posts
20
Registered at
2009-11-12 21:48:35
2013-04-27 00:37:41 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
With the race to The Rock - IRL the tide will be with us for six hours and then against us for six hours. It will be like this all along the south coast so should even out with the virtual yachts.
Posted by
76Trombones


Users avatar

Posts
362
Registered at
2009-08-03 18:04:56
2013-04-27 00:43:46 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
SOL takes a pretty big hit vs irl on nearshore winds, so it's all probably a bit moot.

Looking forward to seeing you guys out on the water!
Posted by
ybw_mjm


Users avatar

Posts
20
Registered at
2009-11-12 21:48:35
2013-04-27 01:51:01 - Re: Jubilant Fastnet Campaign Qualifying Races - POLAR needed
So are we!

It's going to be interesting...

Page: Previous 1 2

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

ORCV Melbourne to Devonport Race 2026

Welcome to the prestigious Rudder Cup, Australia’s oldest and most iconic yacht race! For over 110 years, this legendary 196nm classic has tested sailors' strategy and endurance across the notorious Bass Strait from Melbourne to Tasmania.

Organized by the Ocean Racing Club of Victoria, this year’s battle against the unpredictable Southern Ocean features the stylish Dehler 46. Designed by Judel/Vrolijk as a proper looker and built to race, this regatta cruiser is a virtual flyer packed with modular racing upgrades. Can you master her speed and conquer the shifting elements?

Chart your course and race for glory in this historic adventure!
Race #2068
INFO by brainaid.de
Dehler 46 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TQD - SUPBUD - SYC
Race starts: Oct 30th 03:30 Registration will open soon
▶ Flash
GO TO RACE

PIC Coastal Classic Yacht Race 2026

Kia Ora, SOLers! Welcome back to Auckland for the 2026 PIC Coastal Classic! In partnership with the New Zealand Multihull Yacht Club, Sailonline is thrilled to bring you this iconic 118nm legendary sprint to Russell.

Expect the unexpected on this tricky course up the North Island's East Coast—from adrenaline-fueled spinnaker rides to nail-biting pre-dawn lulls. This year, we take on the elements in the highly popular Seacart 30. Designed by Marc Lombard, this nimble trimaran features a challenging polar that rewards pure tactical precision.

Chart your course, conquer the coastal currents, and race for ultimate bragging rights! Upon crossing the finish line in scenic Russell, the traditional reward of bacon butties and rum awaits!
Race #2067
INFO by brainaid.de
Seacart 30 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - SUPBUD - RED
Race starts: Oct 23rd 22:30 Registration Open!
▶ Flash
GO TO RACE

Mad Max by Balloon 2026 - Across the Outback


Mad Max Rockatansky doesn’t get to go in a balloon in any of the Legends of the Wasteland, and the Wasteland is not necessarily the Outback of Australia, but Mel Gibson and film director George Miller indubitably are… of Australia, and ballooning as reconnaissance is a main feature of the Mad Max spin-off video game, so here goes: 1500nm in a balloon from somewhere on the edge of the Outback, Goondiwindi, to cross a finish line at Fitzroy Crossing, somewhere on the edge of the Outback!
Race #1974
INFOby brainaid.de
SOL Balloon PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: BOL - SYC
Race starts: Oct 14th 13:00 Registration Closed
▶ Flash
GO TO RACE

Arctic Tern - Greenland to Antarctica 2025

Welcome to the fifth leg of our MIG series. Now it's time to race the Arctic Terns, on their migration from Greenland to Antarctica, 8300 NM. This is also part of our monthly Ocean Championship, and as such the first race of OCQ4 2026. This race will be sailed in our Maxi Trimaran. Race #2061
INFO by brainaid.de
Maxi Trimaran PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230 Ranking:
OCQ4 - OCCH - SYC - MIG
Race starts: Oct 05th 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member CriticalHippo
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member rumskib
  6. Sailonline Yacht Club Member Panpyc
  7. Sailonline Yacht Club Member rthinman
  8. Sailonline Yacht Club Member cdhinman
  9. Sailonline Yacht Club Member BRENTGRAY
  10. Sailonline Yacht Club Member ms0689

View full list

Series

Mobile Client

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

The mobile client