Dash-9 Performance Comparison

[OTTODAD]

I do not know what the real performance of this loco is, pulling only 8 woodchip wagons but as I have mentioned before would like ORTS to respond to train brakes and throttle application a bit more like MSTS does.

http://www.otto-wipfel.co.uk/video/dash-9-performance-msts-orts.wmv
Alt-Enter to view Full-Screen.

Your comments ?

O t t o

[sim-al2]

The performance of the locomotive in the OR clip is way more accurate than in the MSTS clip. Even with a very light load, a 188mt locomotive does not take off very quickly. That said, just looking at the ammeter, something is up. In the OR clip, at 12mph it is already down to 100amps, while in MSTS, at 12mph it's at 400amps. Amps as far as I know correspond directly to T.E., so that means that in OR the pulling effort of the locomotive has dropped to 1/4 of that in MSTS! If that trends holds true, either MSTS is overpowering the default Dash 9 significantly, or OR is robbing it of a great deal of power. Unfortunately, my computer will not run OR, so I cannot experiment. Out of curiosity Otto, is this Dash 9 ENG file the same as that in the replacement files you made?

[OTTODAD]

Out of curiosity Otto, is this Dash 9 ENG file the same as that in the replacement files you made?

Yes, it is !

O t t o

[UP_4848_Thunder]

In the wants of realism with tractive efforts? Surprized my topic related to this hasn't been tried out, as there is always going to need to be changes for stocks with OR.

[lindsayts]

The performance of the locomotive in the OR clip is way more accurate than in the MSTS clip. Even with a very light load, a 188mt locomotive does not take off very quickly. That said, just looking at the ammeter, something is up. In the OR clip, at 12mph it is already down to 100amps, while in MSTS, at 12mph it's at 400amps. Amps as far as I know correspond directly to T.E., so that means that in OR the pulling effort of the locomotive has dropped to 1/4 of that in MSTS! If that trends holds true, either MSTS is overpowering the default Dash 9 significantly, or OR is robbing it of a great deal of power. Unfortunately, my computer will not run OR, so I cannot experiment. Out of curiosity Otto, is this Dash 9 ENG file the same as that in the replacement files you made?

In a series wound DC traction motor theoreticaly the torque and therefore tractive effort is proportional to the square of the motor current. In real life this square law does not hold true due to non linearities in the motors magnetic field. In a real life loco with series DC traction motors an aprox doubling of the motor current will cause the tractive effort to increase around 3 fold (Note 1). As yet OR does not model this correctly, it APPEARING the current is aprox proportonial to TE, the load current displayed being a stop gap measure until more accurate physics is attempted, I believe this is to done after OR reaches versdion 1.0.

Note 1: ref, Marks standard handbook for mechanical engineers, chapter on railways,
also GE dash 8 workshop manual, load current graphs in the test section.

LIndsay

[OTTODAD]

Hi Lindsay !

It is being appreciated that ORTS is trying to program realistic physics for MSTS locos running in ORTS but there being so many variations it is impossible to apply them to the hundreds used by the former.

I would make more sense to create a physics performance compromise to suit most locos of certain types, steam, diesel, electric, their DMUs and EMUs to be compatible with the existing settings in their ENG files !

O t t o