Using the Antislip line in AI engine files

[plainsman]

Yes, and take out both Numwheels lines as well.
I am still running into a problem. I setup one of the CSX AC6000CW at 439,600 pounds weight, and adhesion line:
ORTSadhesion ( ORTSCurtius_Kniffler ( 9.5 41.5 0.175 0.7 ) )
I am still getting wheelslip at 33% adhesion (145,000 ftlbs) when these ought to be capable of a lot more (adhesion limit ought to be about 42% on these units, over 184,000 pounds (they have tested one of these at a hair under 205,000 ftlbs with a groomed rail)), and that was WITH SAND, I was holding the sanding button down. ?? Version 2930.

[baldwin]

Got a screenshot?. I have set up an ac6000 with your figures and I get 179,000lb on the Axle Drive force and the same on the Axle Out force when starting. Sand does not seem to make any difference to those figures. Figures start to drop after 10mph is reached. VersionX2940.

I have also noticed that a lot of the figures relating to power, couplings and wheelslip fluctuate quite a lot like a bunch of synchronised swimmers..

[Vince]

I'll just pipe in with one comment here that the relevent OR HUD sure makes it a whole LOT easier to tune engine files!
regards,

[plainsman]

In reverse, I agree Vince, when I figure out how to make it tell me everything, this program has great data to work with!!
The fluctuation has to do with a processing computational error. I am not getting anything in that regard, but I am running a Haswell I7 4770.
On 2930, I am still getting wheelslip too soon. What is the key combination for your HUD? I am running Alt-f5?

[baldwin]

I use F5 to open the HUD, then Shift-F5 through the pages. Alt-F5 normally takes me back to the initial HUD page. Here is my equivalent of yours. Single locomotive with 1900 tons on the drawbar. I am running a Haswell i5 4670, slightly o/ced to 4.2

[apco25]

Bob,

What would be a good way to mass update everything? Adjust your files by that 0.972 value and then use route riter to mass update from there?

[markus1996]

WRT to moving out things on ORTS-only files: You can create such ENG and WAG files in a subfolder of the original files' folder titled "OpenRails" (I think, it´s without space). ORTS will then use those files in there, no matter how much they are different from the original ones, while MSTS still will run on the original ones.

Cheers, Markus

[plainsman]

I just uploaded a set of V4.86OR files for AC locomotives. I would view these as a bit experimental at this point. Since OR doesn't model traction control and auto sanding yet, these files attempt to model that somewhat in the .eng file. Your results will be significantly different depending on how you have the sliders set, and on your adhesion filter increment. Comments appreciated, as this is trying to work around an area that will be better addressed in a future edition of OR. These files should work with OR 2930 or later.
BTW, also the couplers have been reworked for less draconian break strengths. Comments in that area as well.

[R. Steele]

Bob, thanks much for posting in this thread, I sure have enjoyed reading your posts, I have learned so much. Much of it is still over my head, lots to digest, but that's much of the fun! Thanks, again.
I expect Open Rails will revitalize the community and when it moves past V1.0 with its own suite of editors (especially AE and RE) there will be some interesting things to accomplish.

[Gary54]

I want to thank Bob for providing the V4.86OR files for AC locomotives. Bob points out that results may vary depending on several parameters, including the adhesion filter increment. Can anybody explain how this feature figures in the advanced adhesion setting? I cannot seem to find anything related to this in the manual. It appears that the default setting is 10. However, is there an optimal setting or is the setting a function of the slider settings?

Actually, I see that the default setting is, in fact, 10, and that higher values result in "smoother operations but less responsiveness."
Does "less responsiveness" refer to the engine being less responsive to changes in throttle setting as a means of reducing wheel slip?

Thanks in advance for any thoughts on this.

Gary

[plainsman]

Hi Gary,
I am hoping Peter voices a comment on your question. I have mine set to 17, it seems to eat a lot of computer power at very high settings?
I will note one thing I have learned already, the coupler section apparently needs to be set differently. Try the following:
Spring (
Stiffness ( 7.5e3N/m 4.9e6N/m )
Damping ( 9.4e5N/m/s 3.5e6N/m/s )
Break ( 2.32e6N 2.41e6N )
r0 ( 0cm 11cm )
)

[Gary54]

Hi Bob,

Thanks for the update and your thoughts on the advanced adhesion setting.

Should the updated text be added to each AC engine included in your V4.8OR AC set?

Thanks again.

Gary

[Vince]

I have used a chart I cobbled up a few years ago for coupler break forces.

_In Use_FRA Class__Pound Force__exponent setting
Pre 1970 C Working Load 280,000 - 1.26E6N
Pre 1970 C Shock Load 400,000 - 1.78E6N

Current E Working Load 360,000 - 1.61E6N
Current E Shock Load 500,000 - 2.22E6N
MSTS ? Working 12,139,683 - 5.40E7N
Reference:

http://www.alkrug.vcn.com/rrfacts/drawbar.htm

[plainsman]

Vince, I think in 2013 the strongest coupler strength was upgraded to 650,000 pounds tension and 540,000 pounds shock. The shock value is the lesser. Think of it this way, pull on a string and it probably won't break, but snap it quickly and you will break it. Since these are AC files, they would likely be used with the stronger couplers. The 1.6e6N would be fine on most other locomotives. The thought of the folks in OR forum is the extension value ought to be less than the compression value.