Will L wrote:I'm a little worried about your coupling rods. They have a pivot between the leading and middle driving wheels, which is as it should be, but they appear to be solid from there on back to the jack shaft. I would expect the rear driver to jack shaft section to be separate and effectively pivoted on the rear driver crank pin, just like the original, otherwise the middle driver isn't free to move with the compensation. Have I missed a point here?
Part of the High Level "Illusodrive" (I thinks that's how Mr Gibbons spells it) System. The drive cranks are driven & synchronised via a gearbox extension but are not mechanical connected to the coupling rods via the crank pins.
As this part of the coupling rod assemblies is hidden behind the safety mesh on the prototype you can't tell there's no connection. Your track would really need to be uneven for the lever effect on the rear part of coupling rod to move it away far enough from the crank to be noticeable.
You just have to quarter 3 axles instead of 4. You can also build it as per prototype by omitting the illosodrive section of the gearbox and pivoting the rear rod.
The crank axle has yet to be fitted in this video but it should illustrate how the coupling rods work in the Illosodrive system.
https://www.youtube.com/watch?v=qj8E3412AfwJohn,
If you are going to use the later type Bachmann 04 body you can get away without using the High Level front and rear step assemblies. (They would come in handy for a late Class 04 version). I'll show you what I mean next time I see you. Dunno when that might be as this Lurgi is taking some shaking off.
P