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Thread: Davis values (update)

  1. #1
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    Default Davis values (update)

    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?



  2. #2
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    Default

    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:
    Code:
    [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.
    Cheers, Gerry
    It's my railroad and I'll do what I want! Historically accurate attitude of US Railroad Barons.
    Forever, ridin' drag in railroad knowledge.


  3. #3

    Default

    Quote Originally Posted by geepster775 View Post
    As an update to the discussion from back in September,

    It would appear that Peter has successfully addressed......
    Peter, which Peter?

    Thanks,
    Steve

  4. #4
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    Default

    Quote Originally Posted by EldoradoRailroad View Post
    Peter, which Peter?

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

    The site for OR physics, Et al.
    Cheers, Gerry
    It's my railroad and I'll do what I want! Historically accurate attitude of US Railroad Barons.
    Forever, ridin' drag in railroad knowledge.


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