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 » Technical Discussion » Help with polars ( with help of brainaid toolbox)

Posted by
DaniLA


Users avatar

Posts
1
Registered at
2018-07-18 10:51:11
2018-07-26 10:23:58 - Help with polars ( with help of brainaid toolbox)
Hi every body,

I am quite new in SOL and real sailing. I started using SOL as a way to practice with planing routes, but I must confess that I am really exited with the game.

I would like to calculate better the SOG in SOL to evaluate the best routes. Using the steer tool is easy to see in the polar tool the SOG when calculating the current turn. But when I want to find the SOG in other part of the map is when I don't really know how to do it.

As far as I have seen, with the polars tool in SOL you are using TWA and TWS. I have seen in http://sol.brainaid.de/sailonline/toolbox/ a .csv file with a table with more TWA and TWS for a given boat than the provided in SOL (helpful links/Boat polars). My problem is that not always there is a TWA and TWS that is calculated in this file (for example TWA = 55.5, TSP = 4.8, SOG = ??). Do you know how can I calculate the SOG (for SOL) given TWA and TWS?

Thank you so much!!
Posted by
sol


Users avatar

Posts
298
Registered at
2008-08-14 11:08:14
2018-07-28 08:34:50 - Re: Help with polars ( with help of brainaid toolbox)
@DaniLA

I never calculate boat SOG. All the arithmetic has already been done and resulted in the polar (or polar tool as you name it?).

If you move the cursor over the map you see in the right upper corner windspeed & direction.

You can check on the polar what SOG, assuming the same twa, these numbers would give you.

If you want to know the wind conditions on that spot in six hours first move the weatherforecast slider 6 hours in the future and then repeat the same.

There are more knowledgable, real, sol'ers who are experts in polars etc. Maybe they will answer to your questions.

Maybe a tool like 'kroppyer's SPINNACER gives more accurate answer to your speed question.
(http://sol.kroppyer.nl/?spinnacer)

An idea of some values and formulas you need for calculating you can find here?
http://www.samoht.com/spa/boatperfcalc.htm

Lacsareno


--- Last Edited by sol at 2018-07-30 11:09:40 ---
Posted by
kroppyer


Users avatar

Posts
347
Registered at
2010-02-05 15:25:55
2018-08-29 18:53:01 - Re: Help with polars ( with help of brainaid toolbox)
I started developing SPINNACER exactly with this in mind: I needed a way to accurately determine SOG at a given windspeed and angle and use this in calculations.

SPINNACER offers both a graphical as a numerical way to do this. It may be a bit cumbersome at the start, but it sounds like this is the tool you're looking for.

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Cape Town to Rio 2026

Welcome to South Africa and RCYC's classic transatlantic Cape2Rio Race from Cape Town, South Africa, to Rio de Janeiro, Brazil. First run in 1971, this run is buddied with the IRL, Cape2Rio 2025 arranged by the Royal Cape Yacht Club with the cooperation of the
Iate Clube do Rio de Janeiro Despite this being announced the 2025 race (starting dec. 27) it is the 2026 SOL championship kickoff. This virtual version, will be raced once again in Mark Mills' 74ft speedster, the stunning C2R74.
Race #1996 INFO
by brainaid.de
C2R74 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
OCQ1 - OCCH - SUPBUD - SYC
Race starts: Dec 27th 12:00 Registration Open!

▶ Flash
GO TO RACE

ORCV Melbourne to Hobart 2025

Welcome to the legendary Westcoaster, a true test of endurance and seamanship that’s challenged sailors for over 50 years! Spanning 435 nautical miles, this iconic race takes the fleet from Melbourne, across the wild Bass Strait, and around Tasmania’s rugged west coast to Hobart. Organized by the Ocean Racing Club of Victoria, this year our SOLers will be racing the sleek and powerful Dehler 46—a fast, elegant regatta cruiser built for both speed and adventure. Get ready for an unforgettable offshore classic!
Race #1952
INFO by brainaid.de
Dehler 46 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Dec 27th 02:30 Registration Open!
▶ Flash
GO TO RACE

Tasman Double 2025 - Sydney to Hobart

Christmas in Summer? Indeed! Kick off the first leg of our two-leg Tasman Double series in the classic 625nm Sydney to Hobart race, this year in the upgraded SuperMaxi 100v2. Inspired by Neville Crichton’s legendary Alfa Romeo II and her near-sister Wild Oats XI, these yachts blaze across online and real-world waters alike. Feel the thrill even in storm-force winds as you tackle the Tasman Sea—dock in Hobart victorious, or at least in time for a well-earned post-Christmas drink!
Race #1953
INFO by brainaid.de
Super Maxi 100v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TD - SYC
Race starts: Dec 26th 02:00 Registration Open!
▶ Flash
GO TO RACE

Valletta Sprint 2025


We invite you once again to this SOL classic around the Middle Sea, departing from and returning to historic Valletta. Loseley modelled on an IRL classic often sponsored by a luxury wristwatch purveyor, our c 600nm course takes us north as far as Stromboli, then west of Sicily and south to Lampedusa and back to Valletta probably via the strait between Malta and Gozo. This year we will race it all in very Meddy Dufour 40’s!
Race #1949
INFO by brainaid.de
Dufour 40 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
RACE CLOSE: Monday,
December 29 at 2300 UTC.
Race starts: Dec 20th 11:00 Registration Open!
▶ Flash
GO TO RACE

Chatham Island TIMED Chase 2025

The final TIMED race of 2025 takes us to the isolated and mysterious Chatham Islands archipelago 430 nm east of New Zealand’s South Island. There promises to be plenty of breeze from every point on the compass as we sail the Farr 38 around Chatham Island, Pitt Island, and The Forty Fours on this 124 nm course. This is a TIMEDrace so you may RE-REGISTER HEREto try again after finishing a run. You will have 13 days and 11 hours to test your skill and decision making after the race opens.
Race #1990
INFOby brainaid.de
Farr 38 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ4 - TRCH - SUPSOL - SYC
RACE CLOSE: Saturday,
27 December at 23:00 UTC
Race starts: Dec 14th 12:00 Registration Open!
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member WRmirekd
  3. Sailonline Yacht Club Member CriticalHippo
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member bonknhoot
  6. Sailonline Yacht Club Member vida
  7. Sailonline Yacht Club Member CollegeFund
  8. Sailonline Yacht Club Member Sax747
  9. Sailonline Yacht Club Member pepsPV5
  10. Sailonline Yacht Club Member Panpyc

View full list

Series

Mobile Client

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

The mobile client