Tornado

Good news indeed. I will also be pleased to see the A1 back on the mainline. Welcome back young'un!

 

On the subject of young it feels strange with me being a 19 nearly 20 year old but being older than a steam locomotive.

 

I went to a presentation tonight given by a gentleman from the ORR on Rolling Stock Approval, Verification and Assurance where he raised a rather interesting fact. Tornado is actually approved as interoperable under the European Interoperability Regulations.

Regards,

Dan

 

So does that mean the loco is fit to run elsewhere where she is in gauge? i.e other countries?

 

In short, yes! Obviously it would have to be compatible with the signalling etc. and there would be operability issues surrounding coupling and braking etc. but from a technical compliance viewpoint it can go anywhere in Europe that has implemented the Interoperability Regs.

Regards,

Dan

 

One of the important reasons that it could operate in Europe is it carries a CE mark on the boiler .

 

Did 5521 carry the CE mark or did it have grandfather rights when it was running in Poland then?

 

Nope - it was certified IIRC as an Hungarian locomotive and therefore gained rights to European networks ( including Poland ) under that nomenclature.

 

A bit difficult to see from the photos, but I gain the impression that a lot of flexible stays have now been installed over the top of the combustion chamber and front part of the firebox crown compared with previous photos prior to the boiler's departure to Meiningen.

 

Richard - you may be right.

I don't know how you fit "longer" stays to an inner and outer of constant dimensions, but Graham was at pains on Friday to say that the longer the stay the more tolerant to cracking it would be.

 

At least the boiler has something going for it then!!!

 

Here we go again.............

 

As you say, a bit difficult to tell from published photos but I reckon that there has been no change to the combustion chamber and side sheets. Not sure about the back plate but it would be unusual to fit flexibles there

Definitely right to say that the longer the stay, the better. As I've said before, IMHO, stay length is the main problem. With welded stays, for a given water space, you can maximise it by having clearance holes and fillet welds, rather than J prep and tight holes. I don't know if that's what they've done, though. They've replaced quite a bit of platework so it's just possible that water spaces have been slightly increased. That's a bit of serious modding, though!

 

Definitely right to say that the longer the stay, the better. As I've said before, IMHO, stay length is the main problem. With welded stays, for a given water space, you can maximise it by having clearance holes and fillet welds, rather than J prep and tight holes. I don't know if that's what they've done, though. They've replaced quite a bit of platework so it's just possible that water spaces have been slightly increased. That's a bit of serious modding, though![/QUOTE]

Speaking to one of the A1 team at the weekend the stays now protrude through and are fillet welded .originally they were flush with the side sheet also they are tube blanked of at one end instead of drilled bar.

Remember it's a learning curve for everybody.

 

Treat it with the contempt it deserves, chap.

I am intrigued at the discussion of stay length. Why is it exactly that a longer stay resists cracking better?

 

For a given movement of the inner firebox relative to the outer wrapper (as an example), the longer the stay can be between the two results in a lesser bending angle of the stay.

Just hope that I've expressed it clearly enough!

 

Speaking to one of the A1 team at the weekend the stays now protrude through and are fillet welded .originally they were flush with the side sheet also they are tube blanked of at one end instead of drilled bar.

Remember it's a learning curve for everybody.[/QUOTE]

Not sure where this came from, but when I looked in tornado's firebox a while back it had stays that protrude through and were fillet welded as per normal German/American/Chinese practice to name a few.
Seems very strange [and costly] to have stays that are made of tube and blanked one end?

 

Thank you - so a shorter stay will always result in a greater bending angle? For example, ff both a stay of X length is compared to a stay of length 2X, will the bending angle be larger in proportion to its length if the same factors (heat/pressure) are applied to both stays?

 

O level geometry. Draw it out and make your own conclusion.
O level? Showing my age, again!

 

Yes, but also factor in the same amount of movement of both inner and outer firebox plates relative to one another. The solution of the right-angled triangle will demonstrate this.