Sailonline.org - Online Sailing

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!

Sailonline Store

Partners

Profile for Chappo

Name	Chappo
Email Address	peterc@georgjensen.com.au
Avatar
Posts	52

2011-12-12 03:18:44

Re: SOL World Race: Leg 2 Analysis

Board » Races

I have been tweeting Askel Magdahl, the navigator on Sanya who pulled off that clever passing move to win the Rio leg of the last Volvo race on Eriksen 3. He said he uses Expedition and Deckman plus some of his own routing software. I wonder what course he is working on for this Dhabi leg??
2011-11-21 02:22:01

Re: General System Spec - to aid SOL development

Board » General Discussion

3 year old desktop, 19 inch screen accessing via Firefox

Microsoft Windows XP Professional
Intel Core2 6400 2.13GHz @ 2128 MHz
Graphics Card: 256MB ATI Radeon X1300PRO

2046 MB System RAM (Score: 104)
- RAM Speed: 3191 MB/s

CPU Tests (Score: 210)
- Floating Point Operations/Second: 50669288
- Integer Operations/Second: 123177326
- MD5 Hashes Generated/Second: 710277

Graphics Tests (Score: 33)
- 3D Frames Per Second: 112

Hardware Tests (Score: 10)
- Primary Partition Capacity: 298 GB
- Drive Write Speed: 11 MB/s

Nova Bench score 354

Internet download rate 1.78 Mbps

Screen resolution 1280 by 1024
2011-06-02 11:00:39

Re: Gain or loss by using TWA

Board » Technical Support

How do you find time for work Aaron, you have been very busy creating tools, updating your blog, being very competitive in SOL and now working on SOL development! That sounds like a very flash tool you are working on so I will keep an eye on your blog. Thanks for your great work.
2011-06-02 04:25:14

Re: Gain or loss by using TWA

Board » Technical Support

*8MR, I am not an IT guru but wouldn't these choices be made by the SOL server when you are looking at the forum and perhaps it is configures any large attachments that cannot physically be displayed in the message as attachments only.
2011-06-02 02:58:29

Re: Gain or loss by using TWA

Board » Technical Support

8MR, I see the diagram embedded in the post and as an attachment too?
2011-06-02 02:54:50

Re: Gain or loss by using TWA

Board » Technical Support

Excellent summary 76. I presume it is not to scale but broadly highlights the distance differences. It certainly makes a good case for twa but as Aaron notes, just because the fast yachts have curved tracks, often actually reflects continuously adjusting VMC sailing rather than TWA sailing.
2011-06-02 01:46:19

Re: Gain or loss by using TWA

Board » Technical Support

Good points Aaron, it is easy to work with confidence when plotting within 6 hour weather cycles, much more challenging after 6 hours so CC is a safe option. We have all seen some big shift between weather updates. I note you mentioned you have written a small tool that calculates both max VMG (for upwind & downwind) for a given TWS – , and also maximum VMC given input of TWS, TWD and a CC to the waypoint. Does it link to an uploaded polar or does it just require manual input based on different angles and BS from the polar at the time you choose to do a calc. Is that tool available for download somewhere? I use my simple worksheet attached for my max VMC calcs. I find it pretty good downwind, can be misleading upwind.
2011-05-30 23:14:02

Re: Can't get rankings and race leaderboards

Board » Technical Support

Thanks Jack. Yep I am on the work computer where I am getting the Leaderboard and Rankings. I will check my home PC.
2011-05-30 02:50:42

Re: Gain or loss by using TWA

Board » Technical Support

I have taken advantage of the speed difference of CC or TWA in different races and yachts. I am not an expert but I think the differences come from various factors such as the shape and position you are sailing on the polar, whether you are sailing into a heading or lifting wind change and whether you are going upwind or downwind. So even though the CC is a shorter course, that advantage can often be offset by the fact that the last part of the CC course is so much slower than the TWA course (when sailing upwind into a header, or at the start of a CC course into a freeing wind change, the CC course is much slower than the TWA course.
2011-05-30 02:36:34

Re: Can't get rankings and race leaderboards

Board » Technical Support

Update 30 May, now working on work PC, haven't checked home PC's yet.

Races

Next Race: 00d 00h 00m

Current Races:

Wellington to Nelson 2012
Welcome to the first running on SOL of a New Zealand classic race that takes us 104nm from Wellington to Nelson through the notorious Cook Strait. Prepare your SOTO 40s!! Race #445 NOR / POLAR. WX 0430 / 1030 / 1630 / 2230utc. RANKING: Weekend/SYC.
Race starts: Feb 11th 21:00 Registration Open!
GO TO RACE

Sailonline World Race 2011-2012 - Leg 3
The third in this 9 leg race across the globe. Leg 3: A race from Ahbu Dhabi to Sanya across 4600nm in a VO70. Fair Winds challengers! Race #282 NOR / POLAR. WX Updates: 0430 / 1030 / 1630 / 2230. RANKING: Ocean/SYC/SOL WorldRace
Race starts: Jan 14th 10:00 Registration Open!
GO TO RACE

Go to race archive

SYC Ranking

View full list

Series

Mobile Client

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

The mobile client