[copperpen]

No. Traction losses are those incurred in the transmission of the power from the motive unit via the generator/alternator and traction motors to the rail. Adhesion is a different thing.

[edwardk]

If the current MSTS value for MaxPower(HP) is low, is MaxForce and MaxContinuousForce low as well? If they are, what locomotive spec provides both of these?

Edward K.

[edwardk]

After doing some research, it appears that Bob would always use a higher value for MaxForce which I know is for starting tractive effort. I am not sure, but the published information must be tied to the known weight because I found an old post where Bob would calculate MaxForce using a percentage value and the locomotive's weight. The question here is how is the percentage value calculated?

Edward K.

[Fablok]

Yeah. I have use this metod with procentage to calculate GP60 powers. It's fine method but I use it as second in case of false data indication. Look here. Gp have only 2000hp not 3800 and forces for 645engine not 710. http://www.thediesel...EMD%20GP60.HTML After my investigation about tech data for GP60 I cane with this :


Type ( Diesel )
MaxPower ( 2833.6kW ) Comment ( 3800 HP X 87% Eff. )
MaxForce ( 360.3kN )
MaxContinuousForce ( 301.4kN )
MaxVelocity ( 75mph )
MaxCurrent ( 1700A )
WheelRadius ( 20in )
Sanding ( 25mph )
NumWheels ( 8 )
MaxTemperature ( 120 )
MaxOilPressure ( 90 )

[copperpen]

There is a quite informative thread over at trainsim.com by Bob about the various calculations made. Cant remember the thread title though.

[Hobo]

I notice that in post #1 the numwheels for the ES44DC is 12 and in post #14 the numwheels for the GP60 is 8 . Those are wheel counts not axles . Does ORTS use wheel count for Diesels and axle count for Steam ?

[copperpen]

Far as I know, the count is axles, not wheels for both.

[Fablok]

This is thing about I am not sure. But even with number of wheels locos are rolling good.

[edwardk]

The NumWheels() entry in the eng file is not used by OR. This was used by MSTS to help with adhesion. The formula Bob used for MSTS is 0.59(dry rail adhesion)x 2(multiplier in adhesion line)/4(NumWheels) = 29.5%. The percentage value is used to help calculate MaxForce.

25.5% x weight of locomotive = lbs value converted to kN.

[copperpen]

The NumWheels IS now used by the steam locomotive physics and it is intended to roll that out to the others, but it is only the one in the eng section and must be the number of driven axles.