Rhumb line bug

[limelight]

There is a bug that has been reported in the French forum but apparently hasn't been fixed for some reason. It is by no means urgent and other items, such as the new interface development, take precedence, however it does impact something we discussed earlier, how to estimate a competitor's speed.

So here is how the bug can be viewed, the speed indicated by your boat is incorrect and optimistic, your actual speed is only about 95.4 % of the speed on your control panel. The same thing applies to everyone of course, so there is no advantage given to anyone. You can check this 'feature' for yourselves easily, just pick a cell, note your latitude and set your heading either North (0) or South (180), travel this way at constant speed for a few hours, then note your latitude again. You will note that the change in latitude is less than your speed * time.

The points for any headings are truly on the rhumb line, simple calculations using Lat/Lon of 2 points, be they near or far away, show a perfect match with the heading, only the length fall short.

So Glenn, if you persevere in trying to detect your opponent's boat speed, be aware you will need to divide whatever speed you measure by 0.954 to get something to compare to your boat speed

I just thought you all ought to be aware of it.

I hope RG will fix this eventually, It can't be hard to fix, even I know I could do it

[stakk]

Hi John,

Our RG planet is bigger than earth...
No existing plan to fix it in a short time for sure because there are highest priority stuff in progress. Most of the advanced users noticed it as you did. I hope you will manage the little discrepancy. It can be either done in polars or in VRtool.

Cheers.

[zedstar]

Hi John, if Stakk is available he is the right interlocutor for the technical questions.

Hi stakk, finally back.
I have little more of these Australians who make very long sentences that I have trouble understanding.

Like me you have to be happy that the game becomes international, but if you answer, can you say that in the past we have dismantled the game RG as we did with VR and LS just to understand and without asking to change the rules, except for a few glaring bugs.

z* GD

[limelight]

I remember Stakk GD from when he sailed in VR under the aussie blue ensign. He used to be included in my ANZ ranking pages which I did while I could still access data from VR, then they went and encrypted everything (idiots!).

As for the argument that the planet RG is bigger, I don't accept it as surely the nautical mile is originately a measure of angle (1 minute on any meridian), so if the planet is bigger so should the nautical mile be bigger as well to remain at 1 ' of arc. Surely no one living on RG would be stupid enough to define a nautical mile as 0.954'

But I agree that of all things it is relatively minor, working on the new interface takes precedence.

Otherwise, I'm slowly getting use to playing case by case. I will give up shortly as my real boat just came ashore and I need to work on her, not today though, miserable weather in Melbourne, wind and rain.

[stakk]

You remember well sailing Aussie by heart, but French (nobody is perfect ). Happy to see you here!

Hope your real boat is OK and the damages are not too severe. What kind of boat is she?

[limelight]

You remember well sailing Aussie by heart, but French (nobody is perfect ). Happy to see you here!

Hope your real boat is OK and the damages are not too severe. What kind of boat is she?

No damage, just maintenance, antifoul, and I want to replace the bearings on the prop shaft. That's the real pain as there is a skeg before the rudder and they did not offset the shaft, so I need to remove the engine to pull the shaft through the cabin. She's a Van der Stadt (sea dog 29 I think they call her), steel hull, sloop mast head rig. She moves ok once the wind is above 8 knots but she's a bit slow below 5kts.

[stakk]

I guess here https://sailboatdata.com/sailboat/van-d ... sea-dog-29 is the sea dog 29 spec. Nice boat

[limelight]

I guess here https://sailboatdata.com/sailboat/van-d ... sea-dog-29 is the sea dog 29 spec. Nice boat

Yes, that's her lines, the keel is not the deep one, it's more like the dotted one on the picture. Also the rudder isn't spade, it's skeg mounted. Much stronger, but she will not steer properly in reverse unless she's full speed astern

The travelift load cells say she displaces 4500 kg but I have a lot of crap on board so empty 3800 may be right.