Strange Coupling Problem (Tender)

[J94Fan]

Hello

Have a look at this screen shot:


The tender is coupled to the carriage. The locomotive is too close to the tender, and the carriage is too far .

The tender's coupling and buffer code:

Code: Select all

Wagon ( 34061_Tender
	Type ( Freight )
	WagonShape ( 34061_Tender.s )
 	
	Size ( 2.7658m 4.24311m 7.8075m )
	Mass ( "27.396t" )
	WheelRadius ( 33in/2 )
	InertiaTensor ( Box (2.76571m 4.24311m 7.80742m) )
	Coupling (
		Type ( Automatic )
		Spring (
			Stiffness ( 1e6N/m 5e6N/m )
			Damping ( 1e6N/m 1e6N/m )
			Break ( 1.1e7N 1.1e7N )
			r0 ( 20cm 30cm )
		)
		Velocity ( 0.1m/s )
	)
	Buffers (
		Spring (
			Stiffness ( 1e6N/m 5e6N/m )
			Damping ( 1e6N/m/s 1e6N/m/s )
			r0 ( 0m 1e9 )
		)
		Centre ( 0.5 )
		Radius ( 1 )
		Angle ( 0.5deg )
	)

The locomotive:

Code: Select all

Wagon ( 34061
	Type ( Engine )
	WagonShape ( 34061.s )
	
	Size  ( 2.87275m 4.29372m 14.6783m )
	CentreOfGravity ( 0.0m 0.0m 0.0m )
	Centre ( 0m 2.13068m -0.217904m )
	Mass ( 96.25t )
	InertiaTensor ( Box(2.87275m 4.29372m 14.6783m) )
	Coupling (
		Type ( Automatic )
		Spring (
			Stiffness ( 1e6N/m 2e6N/m )
			Damping ( 1e6N/m/s 1e6N/m/s )
			Break ( 3.2e6N 3.2e6N )
			r0 ( 20cm 40cm )
		)
	)
	Adheasion ( 0.15 0.3 2 0.5 )
	DerailRailHeight ( 4cm )
	DerailRailForce ( 240kN )
	DerailBufferForce ( 400kN )

Any help would be greatly appreciated. I have already fixed some issues with Bounding Box Editor

[ianmacmillan]

There are two errors with the tender.

Easiest fix is to change the type to Type ( Tender )

The positioning is not so easy to fix.
The model's origin is not in the centre of the model.
You could try copying the the CentreOfGravity and Centre lines from the .eng file and adjusting the last numbers to move the model but this rarely works.

The only real solution is for the builder to centre the model in the modelling program.

[J94Fan]

Thanks for the quick reply . As a temporary fix, I have reduced the coupling length, and the gap between the tender and coach has reduced somewhat. I have also "borrowed" the Bar Coupling from a Merchant Navy engine, to maintain the distance between the engine and tender.