[Shay 5]

Me and Herb have been working trying to figure out why the tender truck on my 3 truck shay is slipping out of control. Apparently, my shay isn't the only one with this issue. John Davis' 3 truck shay and the D class 4 truck shay both have slipping tender wheels. The slippage got worse in version 0.8. Herb was able to eliminate most of the slippage, but not all of it. Is this ORTS screwing it up? I realize ORTS is a WIP. Just thought I'd let the ORTS team know of this.

[B & O GUY]

Why don't you make it into a locomotive but not power the wheels. The real ones had no power in the trailing unit anyway. It was powered by the lead unit. So if you make it into a locomotive with it's animated drive shaft it should just trail along. Don't animate the wheels. Just use the MSTS Wheels21 and 22 instead of the Wheels1 and 2 and let MSTS animate those wheels.

Allen

[Shay 5]

The tender truck has the same amount of adhesion as the other two trucks. If I was to put 0, it would put even more load on the engine. Not exactly accurate. I believe you divide the total amount of adhesion by how many trucks you have and you get the amount of adhesion for each truck. However, It would be interesting to try.

[atsf37l]

It should be noted that all three shays mentioned use an .eng file for the 'tender' and the slipping doesn't occur in MSTS, only in OR. Allen, your suggestion might well work but the wheels and jack shaft have to be animated or it would appear that the third truck was dragging. :thumbup3:

[B & O GUY]

Jeff

In the simulator you can make a block that floats above the rails. Don't put and bogies or wheels on it. Just a box. Give it an engine file and give it some power and it will pull just like a fancy mega poly model. As long as it has a main object that tells the simulator where the object is, that's where the block will be displayed.

Your tender or tank can still be powered and follow along behind the lead unit just like you want it to. But make the wheels unpowered. You know. :thumbup3: Fool the simulator. ;)

Allen

[Lindsayts]

I have the ShayD and have had no trouble with the tender slipping. Mind you I have extensively altered the eng files for it in order to try and get realistic performance and be better machine to drive. As altered on MSTS the ShayD using AI firing will just pull a 500 ton train up a 1 in 25 grade, this is close to what the real machine will do. I have tried it on the current release version of OR (V0.8) on the same grade with a 180 ton trailing load with no problems at all, the loco control settings being 100% regulator and 30% valve gear.

The Adhesion factor used in the eng file appears to be the tractive effort of the unit divided by the weight of the unit required to produce slipping.

Lindsay

[Shay 5]

H'm, It would have three different parts in the consist wouldn't it?

[Lindsayts]

The following test was done, Route Wolgan Valley Railway,
Train ShayD, trailing load 460 tons using my own eng files
Starting from Newnes oil loading siding,
ending at the second tunnel,
Grade 1 in 25
Speed 8.1mph
Throttle 100%
Valve gear 44
TE loco aprox 156,000 Newtons
TE tender aprox 96,000 Newtons

Time taken to climb to the second tunnel just over 60 minutes
No sign of slipping on either the engine or tender.
The adhesion line for both the engine and tender is 0.2 0.4 2 0

Lindsay

[Lindsayts]

 Shay 5, on 09 October 2012 - 11:41 AM, said:

H'm, It would have three different parts in the consist wouldn't it?

Its not clear what you mean by "three different parts",
The loco and tender are treated as two separate machines, in this case pulling 6 70 tonne oil wagons and a gaurds van.
The loco weight is 105 tons and TE is 40,000 lbs
the tender weight is 50 tons TE is 26,600 lbs.

The weights and TE are based on figures in "Articulated Locomotives" by Lionel Weiner published originaly in 1927, english edition 1930.