Zezo forum:

Post by Alex Wind | 2019-04-30 | 16:11:43

I have seen this race in the calendar but I don't see it ont the index.
The race should be start tommorow.
Someone knows more about it?

26 Comments

Post by zezo | 2019-04-30 | 16:27:14

It will be the next record attempt with open start. Probably replacing the LA-Honolulu.

Post by zezo | 2019-04-30 | 16:56:04

Oh, and I have to fix that nasty 10-years old bug where the chart gets centered to the wrong side of the 720-degree wide earth when crossing the date line to the West.

Post by Alex Wind | 2019-04-30 | 17:53:55

Thank you Big Bird ;)

Post by toxcct | 2019-05-01 | 08:20:17

Also, careful guys, this new record is not done on the same boat as we did on the LA-Honolulu.

Here, we are racing the Ultim Crew Trimaran !

Post by RunLikeTheWind | 2019-05-01 | 08:49:17

Hope this will make things less boring :)

Post by Eldian | 2019-05-01 | 09:54:22

Hello Zezo,
do you plan to provide routing for the Honolulu - Yokohama record ?
The dropdown listbox is still displaying the LA - Honolulu.

Thank you for your great job
Eldian

Post by 7 SEAS | 2019-05-01 | 10:08:47

Still some adjustments to be made apparently

Post by Eldian | 2019-05-01 | 14:29:19

Adjustments done apparently. The routing for Honolulu-Yokohama is on.
Thanx Zezo ;)

Post by Alex Wind | 2019-05-01 | 15:48:50

Forecast looks like good to start today around 22:00.
Who start today?

Post by toxcct | 2019-05-01 | 21:17:13

Nope, forecast is like the best window so far seems to come on next tuesday night...
But it may change until then

Post by YourMomSA | 2019-05-01 | 22:53:59

It changed a lot between the first two forecast updates. If it's going to be that dynamic, then this might just be a matter of picking a time and hoping it works. I'm not expecting my first run to be a great time, but I'm not giving up on it yet either. This patch of ocean seems unlikely to produce a week of ideal fast sailing conditions.

Post by YourMomSA | 2019-05-03 | 18:03:37

Hi Cvetan. I'm trying to remember... what's the range of the impact of the bug? It started when I got into the Eastern hemisphere. My recollection is that it will stop when I get to 170E? If so, that isn't too bad... I'm locked in at TWA 140 with one gybe until I get past 170E anyway.

Post by zezo | 2019-05-03 | 18:58:20

Ooops. I fixed the case when start and finish are in different hemispheres. But not after you pass the line.

Fixed the fix again, but still not sure if and why it will work. That piece of code needs a rewrite from scratch.

You can scroll the chart to the other side as a workaround in such cases. But it gets lost again on zoom/reload.

Post by YourMomSA | 2019-05-04 | 00:08:46

Seems to be working fine, thanks!

Post by braunle | 2019-05-11 | 10:11:52

Hi, I remember a link to a forecast table for best start times for LA - Honolulu. Do we have such a table for Honolulu - Yokohama?

Post by Flying Phil | 2019-05-11 | 12:21:52

Hi,
On the page of the race (http://zezo.org/yokohama/chart.pl?), there is a "predicted times" link
Or you can use the direct link : http://zezo.org/yokohama/times.html

Post by braunle | 2019-05-11 | 14:01:11

Perfect, many thanks!

Post by YourMomSA | 2019-05-11 | 15:27:52

I've noticed a trend that the long-range forecasts in the "predicted times" window tend to be better early and then deteriorate as they get closer. Is that just coincidence, or is there an underlying reason, such that it's likely to continue?

I'm thinking it might not just be coincidence. The longer-range GFS forecasts are spread further apart, right? So when a nice weather system is moving toward the starting position, would that result in a later start appearing to be able to take stable advantage of that weather system longer, only to later have that appearance weaken as the proposed start date gets closer and the GFS data therefore gets more granular?

I haven't noticed this in other record attempts, so either I'm incorrect and it's coincidence, or there's something about the Yokohama weather patterns causing it. (Or it has happened in other events and I just didn't notice)

Post by zezo | 2019-05-11 | 18:14:32

That's the probable cause. Past 240 hours GFS is spaced 12 hours apart, and I don't do interpolation there, just copy the data 3 times.

So you appear to be sailing in a stable wind field during that 12-hour period, while in reality it will be a gamble. And with a ~7 days of race time that happens exactly on the bottom 4 days of the table.

Post by Lukaliz | 2019-05-16 | 01:11:25

Question Sailors.... On a new attempt are the completed times combined and then divided by the number of attempts or are the attempts rated singularly and then the best finish recorded for the VSR Ranking?