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 » Performance diagrams

I'm curious about the VPP diagram for the 40 ft monohull. At high wind speeds, the lines sometimes cross each other, meaning that when the wind is increasing, the boat speed will decrease. I have not seen this in other VPP diagrams and it seems very unexpected to me. How do you explain this?
Lars Möller
Hometown: Karlskrona, Sweden
Hej, Well I am somewhat curious too... Sometimes things happen fast here... One can imagine situations where a higher wind speed results in lower boat speed. When beating this is often the case due to increased drag. When reaching this can also happen when e.g. a certain efficient sail cannot withstand the higher wind loads and thus cannot be used. So, such things can happen BUT: In this case I can agree that we have exaggerated the characteristics too much. Sorry.
...one of the guys behind the game...
Tks for your reply. However, an increased drag can only happen if the speed is increased. So, I'm afraid I'm still not convinced.
Compare for instance the VPP on this site:
http://www.shipman.dk/articles/?m0=6&m1=97
Lars Möller
Hometown: Karlskrona, Sweden
generally I agree that the polar lines shouldn't cross. But.. increased windage and heeling (causing increased rudder and increased displacement)can slow the boat down.
Hi. Fun discussion!. Lamo: one theoretically obtained polar does not make much as evidence unless you know much about the underlaying models. I can show you several polars with crossing curves. Secondly, I don´t think you read my last post thoroughly. Decreased speed does not have to be caused by increased drag. It might be caused by decreased thrust, as I was arguing the last time. I also agree with Pipedream that heal, waves etc complicates life. So, polar-lines might cross, nothing strange there. Ok?

...one of the guys behind the game...
Hi jakob

I guess you have studied polar diagrams a lot more than I. Still I like to understand what I see. For instance, the diagram for the VO70 makes sence as I see it. When reaching at TWA 130, the boat speed will always increase as the wind speed increases. Still the lines cross when close hauled, which you might expect because of increase wind and wave resistance. So far so good.

What I could not (and still cannot) understand is the feature in diagram for the 40 ft monohull at TWA 150 degr, where you have
10 m/s > 10 knots
12 m/s > abt 12,5 knots
14 m/s > abt 12,8 knots
18 m/s > abt 12,2 knots
22 m/s > abt 13,5 knots
In this case it's hard to imagine the behaviour of the 18 m/s line. Wind or wave resistance could hardly have this effect when reaching at 150 TWA.
Lars Möller
Hometown: Karlskrona, Sweden
Post hidden by jakob :
SNIP
Hi, First of all, as I admitted a couple of posts ago I agree that this polar is not perfect, It is hand-manipulated by us. The behavior you are referring to could still be a result of that no optimal sails are available for the 18m/s wind. So, principally, the characteristics are possible BUT I agree that in this particular instance the "bucket" is fairly unlikely. We will in the future try to come up with even more realistic polars. Thank you for communicating with us!
...one of the guys behind the game...

Please login to post a reply.

Races

Next Race: 00d 00h 00m


Current Races:

Tall Ships Races 2025 - Dunkirk to Aberdeen


Welcome to the second of four virtual Tall Ships Races in European waters which are concurrently being organized in-real-life Sail Training International . This second race is from Dunkirk in France up the North Sea to Scotland’s Aberdeen; circa 400nm 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 #1924
INFO by brainaid.de
Barque 90m PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TS - SYC
Race starts: Jul 13th 16:00 Registration Open!
▶ Flash
GO TO RACE

Suursaari TIMED Race 2025

The first TIMED race of the northern hemisphere Summer takes us to the Gulf of Finland on a 165nm zig-zagging course beginning and ending in the seacoast village of Haukilahti and circling the island of Suursaari. It’s only appropriate that the boat for this race is Finland’s own Club Swan 50. 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 #1928
INFOby brainaid.de
PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ3 - TRCH - SUPSOL - SYC
RACE CLOSE: Saturday,
26 July at 23:00 UTC
Race starts: Jul 13th 12:00 Registration will open soon
▶ Flash
GO TO RACE

Lake Ontario 300 Challenge 2025

Lake Ontario Offshore Racing (LOOR) welcomes Sailonline sailors (SOLers for short) to a second virtual version of a race in their annual series, the LO300. As the name implies, the LO300 is a 300nm offshore race across the length and breadth of Lake Ontario, from and back to Port Credit YC. Once again, as is our wont on Lake Ontario, a fleet of Beneteau First 36.7s is being made available to virtual racers. There is an overall prize for the SOLer who best bosses Lake Ontario over the two races hosted by Sailonline, this 300 and the Susan Hood raced back in May; so, let the competition be fierce!
Race #1931
INFOby brainaid.de
First 36.7 PARTICULARS
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking: LOOR - SYC
Race starts: Jul 12th 15:10 Registration Open!

▶ Flash
GO TO RACE

SSANZ Triple Series 2025 - Race 1

Join the excitement as Sailonline partners again with New Zealand's Short-handed Sailing Association for the thrilling SSANZ Triple Series, proudly sponsored by Lewmar Marine. Our SOLers will tackle an exhilarating 47-nautical-mile race, navigating the waters of the beautiful Hauraki Gulf out to Motuora Island via The Haystack and back. Racing virtual Young 88 yachts, our virtual fleet will match skills and strategies with the real-life fleet of the vibrant Young 88 Association. Don't miss this intense, tactical challenge!
Race #1932
INFO by brainaid.de
Young 88 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
SSANZ - SYC
Race starts: Jul 11th 21:15 Registration Open!
▶ Flash
GO TO RACE

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 CLOSE: Monday,
July 14 at 2300 UTC.
Race starts: Jul 07th 16:00 Registration Open!
▶ Flash
GO TO RACE

Young Island to Great Nicobar 2025

The adventure continues as we launch this fifth leg of the RWW series, racing from Young Island to Great Nicobar on the edge of the Bay of Bengal. Get ready for a chilling start as we set sail on the seventh leg of the 2025 Ocean Championship Series! A 5200nm journey of endurance, strategy, and pure sailing excitement. This leg will be pursued aboard the Super Maxi 100v2, pushing sailors to their limits. Do you have what it takes to conquer the Indian Ocean? Join us and put your skills to the ultimate test!
PRIZE: SMPF
Race #1929
INFO by brainaid.de
Super Maxi 100 v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ3 - RWW - OCCH - SUPSOL - SYC
Race starts: Jul 07th 11:00 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 CLOSE: Friday,
July 11 at 2300 UTC.
Race starts: Jun 27th 15:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member CriticalHippo
  2. Sailonline Yacht Club Member WRmirekd
  3. Sailonline Yacht Club Member FreyjaUSA
  4. Sailonline Yacht Club Member KaSToR
  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 vida
  10. Sailonline Yacht Club Member bonknhoot

View full list

Series

Mobile Client

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

The mobile client