Davis values (update)

[geepster775]

As an update to the discussion from back in September,

https://www.trainsim.com/vbts/showth...1-Davis-values

It would appear that Peter has successfully addressed the unrealistically high starting friction forces (the stickiness found in the 0 to 5 MPH range). With the same exact test consist, I can now get a train of 90 cars with a Davis friction block rolling with one SD40-2. Who is gonna be first to set up a parallel install of Mullan Pass and replace the MSTS friction block with Davis values and see if all the activities still function as designed?

[R. Steele]

Yep, you've noticed also, I think this is all in preparation to address coupler issues. It is good work, thanks to Peter.
Some new ORTS parameters were introduced as well...they are underlined below:

[Note--there is always a "space" preceding the first include line--forum software does not show this]
include ( "..\\FXE_ES44AC_4683.eng" )
Wagon (
	Mass ( 188.3t )
	include ( "..\\..\\Common.inc\\Locomotives\\Couplers\\Std_TypeF_Coupler.inc" )
	include ( "..\\..\\Common.inc\\Locomotives\\Brakes\\Std_Loco_Brakes.inc" )
	ORTSAdhesion ( ORTSCurtius_Kniffler ( 6.441 21.049 0.161 0.7 ) )
	ORTSNumberAxles ( 6 )
	ORTSAdhesion ( ORTSSlipWarningThreshold ( 62 ) )
	ORTSBearingType ( Low )
	ORTSDavis_A ( 1814.13 )
	ORTSDavis_B ( 41.3074 )
	ORTSDavis_C ( 8.510148 )
	Comment ( == Assumptions -Locomotive diesel/electric - speed - 65mph (105km/h), Low Torque Bearing, 6 axles, frontal area - 14.8m2, Wagon Weight - 188.3 ton (metric), Drag 1.0 == )
)
Engine (
	Effects (
		DieselSpecialEffects (
			Exhaust1 (
			0 4.81 -2.85
			0 1 0
			0.18
			)
		)
	)
	ORTSDriveWheelWeight ( 188.3t )
	ORTSNumberDriveAxles ( 6 )
	include ( "..\\..\\Common.inc\\Locomotives\\Std_Eng_ES44AC.inc" )
	include ( "..\\..\\Common.inc\\Locomotives\\Brakes\\Dynamic\\ES44AC_188-3t_DynBrakes.inc" )
)

I think my "frontal area" (14.8 sq. meters) is too high...appreciate feedback or references to correct measurements.

[EldoradoRailroad]

As an update to the discussion from back in September,

It would appear that Peter has successfully addressed......

Peter, which Peter?

Thanks,
Steve

[R. Steele]

Peter, which Peter?

Thanks,
Steve

Open Rails developer - Peter Newell - SteamerCtn -- https://www.coalstonewcastle.com.au/

The site for OR physics, Et al.