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!

Tweets by @sailonline

Board » General Discussion » Velocity made to course

Page: 1 2 3 Next

Posted by Adam Posts 5 Registered at 2009-01-11 16:55:10	2009-01-22 05:23:40 - Velocity made to course
	Is it possible to add this indicator ? Plus miles lost or gained in lets say last 3 hours to the leader ? And mark on the polars the optimum upwind/ downwind angles to VMG ?
Posted by jakob Posts 364 Registered at 2007-09-04 10:05:30	2009-01-22 07:59:59 - Re: Velocity made to course
	Thanks for the suggestion. I will put it on the list but I cannot promise anything soon. ...one of the guys behind the game...
Posted by Jeroen Posts 245 Registered at 2007-08-15 09:17:47	2009-01-23 14:02:03 - Re: Velocity made to course
	We are working on some additional race information. In the mean time you can find a lot of race info here: http://stenum.se/sailonline/ I am a ex-admin of SOL who joins in from time to time.
Posted by Impromptu38 Posts 8 Registered at 2009-01-04 22:30:14	2009-01-23 19:40:08 - Re: Velocity made to course
	Joeron: The experimental information is just fantastic: Great Work I will overload my thinking, but I like haveing that information at hand. Thanks, Ron Casciato, Impromptu38
Posted by AGage Posts 411 Registered at 2008-12-27 10:31:57	2009-01-25 16:26:56 - Re: Velocity made to course
	a6km said @ 2009-01-22 05:23:40: Is it possible to ..... And mark on the polars the optimum upwind/ downwind angles to VMG ? ================================ If VMG is indeed relevant, you can find the optimum angle quite easily using the steering tool, as it shows you the boat speed and vmg values for various angles as you slowly move the pink 'steering line' to different headings on the map. Note near the bottom right corner of the polar diagram this information is provided. (Hint: look around 42 upwind, and 142 downwind, approx) Also, it seems to vary very slightly in differing wind strengths, ie from 10 knts to 25. You can also calculate vmg quite easily with any calculator, incuding the standard Windows one, using the formula: boatspeed * cos(D - twa), where D is 0 for upwind and 180 for downwind, and always use the positive twa (ie if it is actually -140, use 140, although this is really only necessary for downwind calculations. More specifically twa should be replaced by angle to the rhumbline, but often twa is fine. Hope this helps... But one question to the developers of this great software (I am a programmer also).... As the vmg is only displayed to a single decimal point (in the game screen not the polar diagrams), is there any reason to sail at an angle that gives a vmg of, say, 7.43 than 7.47? or is it always rounded (up & down)? I help develop the client interface for the best online ocean racing sim there is... __/)/)_/)__
Posted by jakob Posts 364 Registered at 2007-09-04 10:05:30	2009-01-25 21:04:02 - Re: Velocity made to course
	Thanks for the feedback!! vmg is rounded only in the user interface. Internally we never round anything. Ohh yea, I think kalle rounds the numbers sent in the commands fom client to server. Hence, twa and cc is not sent to server with more than 2 decimals I think. /Jakob (one of the developers) ...one of the guys behind the game...
Posted by Adam Posts 5 Registered at 2009-01-11 16:55:10	2009-01-26 12:53:30 - Re: Velocity made to course
	AGage I know that I'm just saying not everybody understands here what is really going on so an indicator of VMC not VMG is often better because it tells you how fast is the boat traveling to the next waypoint or finish or scoring gate. We know that the straight line is often not the fastest one ... and a lot of people get confused with the VMG as when they reaching the VMG is really small but they sailing so fast so why is it small ? I think it would be nice to have this indicator one day. Cheers.
Posted by Zembu Posts 41 Registered at 2008-12-15 20:58:27	2009-01-26 14:41:49 - Re: Velocity made to course
	Re having VMC, firstly if it were possible, surely this would make it too easy and secondly it would impose a huge burden on the servers as everyone's waypoints (to which their respective VMC's related) would be different.
Posted by jakob Posts 364 Registered at 2007-09-04 10:05:30	2009-01-26 16:20:00 - Re: Velocity made to course
	Hmmm, I think that VMC would confuse sailors too. Imagine the case here you are far from the rounding mark which is almost 90 degrees to your right and you are heading exactly straight to the goal. Your vmc would read almost 0.0 while sailing 25 knots! That will be confusing. Or.. ...one of the guys behind the game...
Posted by erratic Posts 5 Registered at 2008-10-15 19:35:40	2009-01-27 06:25:00 - Re: Velocity made to course
	^ There shouldn't be any additional load on the servers - the client could calculate it.

Page: 1 2 3 Next

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Bay to Bay 2024 - Leg 1 - Great Sandy Strait

Prepare for an adrenaline-packed race as the pristine waters of the Great Sandy Strait beckon for a thrilling showdown! This first race of our two-race series stretches over an amazing 16-nautical-mile course, with our skilled sailors at the helm of their Seascape 18s. With fierce competition and a fantastic post-race BBQ awaiting our sailors at the finish line, what more could we ask for?! Brace yourself for a fascinating adventure and we look forward to seeing you at the start line!
Race #1801
INFO from brainaid.de
Seascape 18 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: B2B - SYC
Race starts: May 04th 01:00 Registration Open!

▶ Flash

GO TO RACE

Manilla to Calbayog 2024

After six years, we welcome you to the race created by sassy63 for the second time. He takes us to the Philippines to race around islands on a 380 nm course. We sail the Italia 14.98 and in Calbayog we'll enjoy our well-deserved Palatan dish and drink it with San Miguel.
Race #1803
INFO from brainaid.de
Italia 14.98 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
ARQ2 - ARCH - SUPSOL - SYC
RACE CLOSE: Tuesday,
April 30 at 2300 UTC.
Race starts: Apr 22nd 17:00 Registration Closed

▶ Flash

GO TO RACE

Melbourne to Osaka Prelude 2024

Welcome once again to what these days is Sailonline’s almost annual virtual Melbourne to Osaka Yacht Race. In real life, this double-handed 5500 nm race between these two sister cities, one deep in the southern hemisphere, the other high in the northern hemisphere, is run every four to five years, and is planned to be held again in 2025, so this race is a Prelude in partnership with the Melbourne Osaka Cup 2025 organising committee collaborating with the Ocean Racing Club of Victoria (ORCV), and the Sandringham (SYC) and Osaka Hokko (OHYC) yacht clubs. On this occasion, we’ll be racing the well-known First 40, a popular size of boat for a long-distance double-handed race. With the doldrums unavoidably lying across the track, you can expect to be at virtual sea for at least a month!
Race #1669
INFO by brainaid.de
First 40 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Apr 20th 00:00 Registration Closed

▶ Flash

GO TO RACE

Cape Town to Auckland 2024

Welcome to the second leg of this Round The World series 2024. It's also the April edition of this year's ocean race championship. The course is the same as the one sailed in 2023, but this year we sail the iconic Swan 65, as suggested in the concluding RTW race last year.
Prepare yourselves for an epic 30-day journey, navigating through the unpredictable waters of the South Seas. It's essential to take care of provisioning to ensure a smooth and enjoyable race experience. With the longer duration, we anticipate plenty of opportunities for camaraderie, competition, and unforgettable memories.
PRIZE: SMPF
Race# 1789
INFO from brainaid.de
Swan 65 PARTICULARS
WX updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ2 - RTW - OCCH - SUPSOL - SYC
RACE CLOSE: Sunday,
May 5 at 2300 UTC.
Race starts: Apr 01st 11:00 Registration Closed

▶ Flash

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