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Nunney Castle

Discussion in 'Steam Traction' started by richard67, Jun 23, 2014.

  1. Jimc

    Jimc Part of the furniture

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    Oh indeed it was - the GWR General appendix to the rule book has no less than 6 pages on restrictions on various types of carriage, both within the GWR system and elsewhere. I do think they were slightly less precise about it though. There are some LNER documents at Kew discussing standardising loading gauge dimensions and rules for what stock could be used on which routes, including a letter from one division objecting to the proposals on the grounds that they would prohibit certain stock from running on routes where it had been in use for many years.
     
  2. RAB3L

    RAB3L Member

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    With regard to the aforementioned video, it seems that Nunney is being rebuilt with a three-row superheater! At about 40mins.
     
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  3. Sidmouth

    Sidmouth Resident of Nat Pres Staff Member Moderator

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    I think that one has been mentioned before . be interesting to see what difference that makes to 5029 . Speaking with someone who has driven all the main line castles the description was 5029 was a flyer on a lighter load but never an engine happy slogging a heavy one (5051 was happy as anything with a good load on the drawbar)

    she will be a curious engine with a Hawksworth tender body on collett chassis and a gti boiler . if going for three row you wonder why not go all in a four row along with a double chimney
     
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  4. marshall5

    marshall5 Part of the furniture

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    You mean like 7027 was?
    Ray.
     
  5. bristolian

    bristolian Member

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    7027 was a single-chimney Castle.
     
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  6. marshall5

    marshall5 Part of the furniture

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    Oops!
     
  7. 60044

    60044 Member

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    Does that mean a boiler swap,then? If so, what with?
     
  8. Pete Thornhill

    Pete Thornhill Resident of Nat Pres Staff Member Administrator Moderator Friend

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    No boiler swap, just modification to the more modern specification. It was all detailed ages ago in one of the magazines (can’t remember which one it was).
     
  9. Jamessquared

    Jamessquared Nat Pres stalwart

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    Possibly not a boiler swap, but changing how many rows the superheater has requires at a minimum a new front tube plate, and a new inner firebox tube plate, not to mention requiring casting of a new superheater header (if one isn't available from elsewhere) which is a particularly complicated casting to make. So it is not a small modification.

    Tom
     
  10. Pete Thornhill

    Pete Thornhill Resident of Nat Pres Staff Member Administrator Moderator Friend

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    Yes indeed it is, if I could remember which magazine and when I’d find what was said but unfortunately cannot. I suppose the way I worded it made it sound simple!!!
     
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  11. ghost

    ghost Part of the furniture

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    I think I remember reading that article too. I may be wrong but I think the header was coming from 7027
     
  12. RAB3L

    RAB3L Member

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    If that is correct, it will interesting to see what 4709 has! A row of empty flues?
     
  13. Sidmouth

    Sidmouth Resident of Nat Pres Staff Member Moderator

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    it may be the case that a boiler swap may have been a better idea than major surgery to upgrade 1 and then unused flues if whatever superheater a 47xx had is fitted on 4709 . the way the night owl is being built just feel wrong to me
     
  14. RAB3L

    RAB3L Member

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    They would have to put something in the flues, otherwise it won't steam very well. It might be more sensible to obtain a superheater header compatible with the boiler?
     
    Last edited: Nov 2, 2024 at 8:34 AM
  15. Hermod

    Hermod Well-Known Member

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    Is superheating advantageus on less than 10km trips in Preservation Land?
     
  16. Jamessquared

    Jamessquared Nat Pres stalwart

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    Not particularly - but blanking off the superheater in a boiler that was designed to be superheated gives you the worst of all worlds, since you lose heating surface by having reduced number of tubes, and the draughting gets mucked up because all the designed ratios get disrupted, and the hot gases preferentially go through the flues (without much surface area) rather than the tubes.

    Tom
     
  17. Hermod

    Hermod Well-Known Member

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    OK but if firebox frontplate of cupper has to be changed anyway?
    Smokebox tube plate is made of cheap steel.
    Chapelon argued that some % of the cylinder efficiency loss, when not superheating ,can be recovered by more small tubes giving better boiler efficiency..
     
    Last edited: Nov 1, 2024 at 9:45 PM
  18. 60044

    60044 Member

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    Is
    Is Nunney Castle expected to do many trips less than 10Km then?
     
  19. craigy

    craigy New Member

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    I think that was aimed at the Owl rather than Nunny.
     
  20. ianh

    ianh Member

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    I would think that 5029s overhaul had been planned, specified and started before the situation with 7027 changed at the GCR..... with the benefit of hindsight things might have been done differently.....
     

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