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 » Performance loss

Page: First Previous 7 8 9 10 11 12 13

I hate to play the ignorant here, but at the level of my SOLing, I do not particularly care about the distance lost by tacking or gybing--they are inevitable!!!
What I need is a quick 'graphical' method of determining the perf loss I will suffer when I round a mark that I am approaching. I want to know what perf loss I will have--and if it is greater than 7% (which will reduce my perf below 93%)---what angle do I need to turn to make the first part of a two-part turn give me a perf loss of slightly less than 7%? I can then complete my turn without incurring further perf loss. This works directly as stated, only for gybes...???
You state that, when tacking, the perf loss is equal to half of the new boat speed. This is not helpful, as I do not know what my new boat speed will be until I know the perf loss. (This is a circular argument!)
What I need to know as I approach a position or a mark, at which I will tack, is a way to determine quickly if my perf loss will be more than the 7% level, and if it is, to what angle should I make the first part of my tack, so that I may complete the rest of the tack with no further increase in loss.
I realise, that whatever my total perf loss from my tack, I will pay the penalty of 'distance and time lost'--there is nothing I can do about that!!!

--- Last Edited by Rod at 2016-11-24 20:03:36 ---

--- Last Edited by Rod at 2016-11-24 20:04:25 ---
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
The boatspeed that is used to calculate the performance loss after a change of tack is the boatspeed on the new course with 100% performance (this might not be clear from the document).

You want to know how much you loose when you have a choice. For example "gybe directly" vs "gybe with an extra command", or "tack every 2 minutes along the shoreline" vs "tack every 30 seconds along the shoreline". Distance lost or time lost can help with a rough estimate of how much you gain/loose with either option.

The more exact option is to look at the average VMC during the manoeuvre (as long as the time interval are the same). To use this, you need to fully understand sailing with VMC, as outlaw explains in his solfans posts.

The main purpose of having performance loss is to make skippers decide between things like "tack every 2 minutes along the shoreline" vs "tack every 30 seconds along the shoreline" and choose the realistic option because it's fastest. We've seen that the current performance model fails in this regard when the boats are on the extreme ends of the scale (AC72, DN, Square Rigger).
The current performance model has as a (in my opinion, unwanted) side-effect that the way we tack/gybe our boats can have a large influence on performance loss.

Anyway, I hope I cleared up the circular reasoning (which can actually be solved with some math, but why bother, it's not necessary anyway) and I hope you understand (to the extend you want to) the importance of "distance lost" and/or other metrics to quantify the losses the are the result of particular manoeuvres.

--- Last Edited by kroppyer at 2016-11-26 01:00:26 ---
I am starting to follow your reasoning about the Perf loss while tacking or gybing. However, at this point in my practice, you are one step ahead of me still. So far, I am still at the stage of trying to keep my perf loss to a minimum. At lower boat speeds most of these manoevers can be carried out while still keeping the loss to 7% or less. It is only at higher speeds that a course change can result in a loss greater than 7%. My concern then becomes my efforts to reduce this loss to as close to 7% as possible by tacking or gybing in a double action, so that the second part of the action will result in no further increase in loss.
I have not yet reached the degree of sophistication where I start to worry about a choice of how much I am able to minimise the losses in a series of tacks or gybes in quick succession.
I will attempt to extend my thinking to such operations as multiple tacks along a shoreline (which I have observed being done without clearly understanding "why").

--- Last Edited by Rod at 2016-11-25 21:56:32 ---
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
A series of tacks (along a shoreline) is not to minimise performance loss.

In a right shift, you are best of being the rightmost boat (within the laylines*). Sometimes a landmass is in the way of being the rightmost boat and you have to tack to keep clear. Question is, how long do you keep on sailing in the wrong direction before tacking back to the right? For this you need to know two things:
- how much am I losing by sailing in the wrong direction?
- how much am I losing by tacking?

The second one requires an understanding of the performance loss model, even when you are in no way trying to "cheat" the model with fancy manoeuvres/tricks.

One simple tactic: when your performance is enough below 93% (after beaching for example), you don't lose anything with two additional tacks to bring you more to the right: you are free to tack very quickly along the shoreline until your performance is over 93% again. The tricky thing here is to avoid another bbq, and you're usually not wining much anyway.

(* typically just outside the laylines actually, but that's besides the point here)
Kroppyer (and others). This is a very important thread, about a topic often poorly understood by newbies - I still consider myself one of them.

Is there any timeline being proposed for the changes to PL (and recovery)? It does seem well overdue. I will not add my 2c to the "way to change" argument.

A thought I would like to add is to add some light info to the Manual in Section 1.9 - a brief explanation of what happens and how to minimise it. Perhaps a link to a page with more info. The piece Yohann wrote in his post in this thread on 2016-05-06 16:01:13 is perhaps the most elegant I have come across.

A quick "Thank you" to all in the SOL community who work so hard to maintain and improve this simulator :)

I'm new to SOL and quite frankly, this thread makes me not want to be involved. Along with another aspect that I believe exists, which is account sharing?

I understand the idea of performance being lost through a tack or gybe, but does it really make a difference to who wins or loses a real ocean race?

The fact that it is being used in the way described in this thread makes me think the whole game is broken. IMO it would be better to have no Performance Loss at all than to have people gaining a competitive advantage from abusing it. And the answer is "well, anyone can work it out and use it for themselves, so that means its okay..."
No, it's not. It's Cheating.
Hi PresentTense,
Welcome to sailonline! You have very quickly discovered what I think is the worst aspect of sailonline. Performance loss usually does not really play a role in race on sailonline, but some of the shorter races (sprints/timed races), or those with special circumstances (sailing with tallships, weather that gives a large advantage to hugging the coast, etc.) sometimes bring out the worst of the current implementation of performance loss. In those cases people with a full understanding of how performance loss works in sailonline can leverage their knowledge to gain an advantage over the competition. Of course people with more knowledge and experience should have an advantage over the competition, but this type of knowledge has nothing to do with sailing, so it shouldn't give an advantage. I think everyone would agree. We need to change this.

So yes, for most of the races (esp. the ocean races) it doesn't really make a different whether or not we have performance loss. But by disabling it, there will be a small number of cases where the fastest route includes tacking/gybing every 10 seconds. Performance loss takes solves almost all of this small number of cases, but as a side effect introduces a smaller number of cases where performance loss itself has an undesirable effect on racing.

I think the current performance loss is better than no performance loss, but it could definitely do with some improvement. I'm convinced we can make performance loss better, meaning: it prevents tacking/gybing every 10 seconds in all cases and it has less side effects.

I really hope the current performance loss implementation doesn't affect your enjoyment of the game/simulation. In normal ocean racing is only very rarely that people with a full understanding of performance loss can use it to their advantage (to gain 10 or 20 seconds).

Page: First Previous 7 8 9 10 11 12 13

Please login to post a reply.

Races

Next Race: 00d 00h 00m


Current Races:

Gladstone Ports Corporation Brisbane to Gladstone Yacht Race 2023
       

Welcome everyone to the 75th anniversary of the GPC Brisbane to Gladstone Yacht Race , Australia's other classic ocean race. Once again, Sailonline is delighted to offer you the opportunity of virtually racing its TP52 over this challenging 308nm course.
Race #1670
INFO by brainaid.de
TP52 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
RANKING: SYC
Race starts: Apr 07th 01:00 Registration Open!

▶ Flash
GO TO RACE

Sinbad Measures Madagascar 2023
Sinbad Al-SOL’er, now well on his way around the seas and shores of the Indian Ocean, invites you to continue with him on his voyages – on to Madagascar with a commission from the Sultan to measure her coast and to explore some of her far-flung islands. Join Sinbad then this time in a Riptide 50 round a roughly 3000nm roughly triangular course out to Rodriguez Island and back for a close cartographical cruise down Madagascar's western shore and home.
Race #1638
INFOby brainaid.de
Riptide 50 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - SVS
Race starts: Apr 02nd 11:00 Registration Open!

▶ Flash
GO TO RACE

Corsica PYOC Sprint 2023
Welcome to Corsica, where our sprint race journey for the second quarter of 2023 will begin! Starting in Capraia, a small island in the Mediterranean Sea and ending offshore of Giglio, our SOLers are sure to experience some extraordinary scenary! The boat of choice for this beautiful 75nm race is the AC72v2, with high speeds and beautiful scenery what more could one ask for?
Race #1678
INFO by brainaid.de
AC72v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
SPRQ2 - SPRCH - SUPERSOL - SYC
Race starts: Apr 01st 09:00 Registration Open!

▶ Flash
GO TO RACE

Melbourne to Osaka 2023
Welcome to Melbourne for Sailonline's alternative version of the Melbourne to Osaka Double Handed Yacht Race - a 5000 nautical miler. This year again we're racing the RP-66, but the route is unlimited what comes to waypoints. Because the IRL version does not run this year, we took the freedom to make our own route!
It could be a long race, east or west, and of course some doldrums to negotiate!
PRIZE: SMPF
Race #1679
INFO by brainaid.de
RP-66 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
OCQ2 - OCCH - SUPSOL - SYC
Race starts: Apr 01st 02:00 Registration Open!

▶ Flash
GO TO RACE

Sail Around Turkey 2023

This is one of Sailonline's iconic and more challenging races. Our IMOCA 60 Foil high-speed yachts will sail across three seas (Black Sea, Sea of Marmara, Mediterranean Sea) and two beautiful straits (Strait of Istanbul - Bosphorus and Strait of Canakkale - Dardanelles). Altogether 1372 nm of great and demanding sailing from Hopa (the easternmost point of the Turkish Black Sea coast) to Iskenderun (the easternmost point of Turkey's Mediterranean coast). Get ready for a lot of fun; we are waiting for you at the starting line.
Race #1665
INFO by brainaid.de
IMOCA 60 Foil PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
ARQ1 - ARCH - SUPSOL - SYC
RACE CLOSE: Monday,
April 3 at 2300 UTC.
Race starts: Mar 21st 15:00 Registration Closed

▶ Flash
GO TO RACE

Sinbad Seeks Spices 2023
Having surveyed Arabia, Sinbad Al-SOL’er next invites you to race him on his second of seven epic voyages to every corner of the Indian Ocean and beyond, this time to seek spices in Zanzibar, departing from Xaafun, a trading post on the tip of the Horn of Africa since the days of the Mycenaeans and on through Roman times to the Nights of 1,001 of AL-Sail’or, Al-SOL’er’s illustrious ancestor. SOLing by the sun and the stars, aka seat-of-the-pants, the voyage will take you east as far as Praslin island, south as far as Anjouan, to Zanzibar’s Unguja for all things spices, but only back as far as Mogidishu – another exhausting 3000nm adventure, this time in Reichel/Pugh 66s.
Race #1637
INFOby brainaid.de
Reichel/Pugh 66 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - SVS
RACE CLOSE: Thursday,
April 6 at 2300 UTC.
Race starts: Mar 19th 09:00 Registration Closed

▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member WRmirekd
  2. Sailonline Yacht Club Member FreyjaUSA
  3. Sailonline Yacht Club Member Pit8008
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member Vida_Maldita
  6. Sailonline Yacht Club Member Sax747
  7. Sailonline Yacht Club Member Kipper1258
  8. Sailonline Yacht Club Member sassy63
  9. Sailonline Yacht Club Member TarassBoulba
  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