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: Previous 1 2 3 4 5 6 7 Next Last

I just did two gybes in a row in the start of the Kergulen timed race. In the first I forgot about the 93% and my perf dropped below 85%. I started the second gybe with a perf of 89% and stepped around in about 4 or 5 steps, completing my gybe at a perf of 90% increasing my perf at each step.
I contend this is vital information that should be known to all, that it cannot be derived by direct observation, or by prior knowledge of how a sailboat performs in reality!
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
These discussions have occurred in the past but it tends to run in cycles so that when it re-emerges often what was once public knowledge can subside into a quasi state of urban lengend.

Finding these nuggets in this Forum can be a challenge even if you are looking for something that you yourself have posted.

=========================
Wrong Speed VMG

Posted by
Jakob Kuttenkeuler
2009-02-09

(discussing performance loss model)

"Well, the current model determines
if the maneouver is a tack or a gybe
or just a minor change in twa
(dTWA is the twa change).
If (tack or gybe)
{e = 1.0-self.bs/200.0}
else
{e = 1-abs(dTWA)/25.0}.
perf = perf*e.
However if perf<0.93
no further maneouver loss is done. something like that."

--- Last Edited by A2R at 2013-10-11 13:48:19 ---
None so blind
Many thanks, A2R!!!!
That is the information that we should have had right at the beginning of this whole discussion. I hope that it will be incorporated in the Manual in a prominent position.
I have inquired about the perf loss problem several times over the last three four years and, until now, never received even a hint of an answer
P.S. I will attempt to generate a diagrammatic representation of this situation for the benefit of those among us who are more comfortable with diagrams than equations.
P.P.S. Now all we need to find out is the rate at which the Performance returns to 100% after a Tack, Gybe, or Course Change.
I do hope someone will post the info---in the meantime I will experiment in the Kergulen screen (there are no good windows in the time remaining.)

--- Last Edited by Rod at 2013-10-11 14:33:17 ---

--- Last Edited by Rod at 2013-10-11 14:41:56 ---
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
Well depending on your Point of View it was either hiding in plain sight or it was a needle in the haystack, so to speak.

I found it because I went looking for it, plain & simple, as anyone could have done.


None so blind
You can only look for things that you suspect do exist. My point is that there is nothing in the performance of a sailboat during a change in course that would lead anyone to suspect that the loss of speed would be reduced by dividing the course change into two steps.
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
I neither knew that it existed or that it did not exist. Looking is a choice as is not looking. I found more than I expected to, so let's move forward from here.
None so blind
"You can only look for things that you suspect do exist."
No accounting for Serendipity, eh Rod?
;-)
Relying on Serendipity makes you a "Prince of Serendip". I am no 'prince'...science does not rely on just good luck. It needs observation, reasoning, and experimentation. Good luck may happen---then you win the lottery and don't have to worry about anything except greedy relatives.......
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
Initiative often succeeds where rationalization cannot.
None so blind
ciao ALL my friends ;)

just a little contribution from me on this subject :

I remember a few years ago a french soler discovered that jybing in several steps was reducing the perf loss, so I tried to see how it worked ......I did it once only and never again .

two main reasons for that :

1) by so doing the boat runs a longer course , and some of your perf loss saving is gone already, and the time at lower speed below VMG during the maneuver eats away another portion of the saving

2) ( and this is the main reason ) ....after the jybe your angle towards the next mark will no longer be the same and could be worst .......for longtime.

It is very true that also the contrary of item 2) may occur , but item 1) still stands .

IRL an offshore jybe is " smoothed" not so much for performance , but maily for smoothing the maneuver by the crew and keep the spi flying ......whilst , in-shore jybing around a mark smoothing the jybe could cost a number of positions .

Hope you all accept it as an opinion and contribution ..

ciaooooooooooooo ;) ;) ;)

Piero

PS : I did win quite a number of races in SOL , but never because I smoothed jybing or tacking to reduce perf loss..;)

Page: Previous 1 2 3 4 5 6 7 Next Last

Please login to post a reply.

Races

Next Race: 00d 00h 00m


Current Races:

San Diego to Puerto Vallarta 2024

Set sail for adventure with Sailonline's third epic voyage, in collaboration with the San Diego Yacht Club! Prepare for the ultimate challenge: a 1000-nautical-mile race to Puerto Vallarta along the stunning Mexican Riviera. As the real fleet ventures forth, we'll be right beside them, guiding our Santa Cruz 70s toward the sun-soaked shores of Puerto Vallarta! Are you ready to join the excitement?!
Race #1784
INFO by brainaid.de
Santa Cruz 70 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Feb 24th 20:00 Registration Open!
▶ Flash
GO TO RACE

Buenos Aires to Punta del Este TIMED Race 2024

Hello Argentina! Hello Uruguay! We are back after fourteen years, on the brown waters of the Rio de la Plata to race from the shores of Buenos Aires to the beaches of Punta del Este. This is a TIMED race, so be sure to re-register using the link below after you have finished a run, so that you can be ready to go again if fairer winds present themselves!
RE-REGISTER HERE to race again after finishing a run.
Race #1783
INFO by brainaid.de
Carkeek 40 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
RANKING:
TRQ1 - TRCH - SUPSOL - SYC
RACE CLOSE: Saturday,
March 2 at 2300 UTC
Race starts: Feb 18th 12:00 Registration Open!
▶ Flash
GO TO RACE

Perth to Mombasa 2024


Embark on an exhilarating maritime odyssey - the second leg of the 2024 Ocean Race Championship. This daring expedition charts a 4500nm course from the shores of modern Perth to the historic port city of Mombasa. Braving the vastness of the Indian Ocean in our high-performance OPEN 60, this voyage promises to be not only a test of skill and strategy but an immersive experience in the untamed beauty of the world's oceans. Join us as we push the boundaries of seafaring prowess on this epic adventure, where every wave will tell a tale of determination and triumph.
PRIZE: SMPF
Race #1762
INFOby brainaid.de
Open 60 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ1 - OCCH - SUPSOL - SYC
RACE CLOSE: Thursday,
February 29 at 2300 UTC.
Race starts: Feb 05th 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member WRmirekd
  2. Sailonline Yacht Club Member Pit8008
  3. Sailonline Yacht Club Member FreyjaUSA
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member sassy63
  6. Sailonline Yacht Club Member Kipper1258
  7. Sailonline Yacht Club Member bonknhoot
  8. Sailonline Yacht Club Member wsguerin
  9. Sailonline Yacht Club Member CollegeFund
  10. Sailonline Yacht Club Member Vida_Maldita

View full list

Series

Mobile Client

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

The mobile client