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71000 Matters

Discussion in 'Steam Traction' started by paralaxerror, Jan 12, 2013.

  1. class8mikado

    class8mikado Member

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    Me too. I also think the Caprotti is what gives the Duke a unique personality but its not the only thing that makes the Duke exceptional.
     
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  2. 240P15

    240P15 Member

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  3. TonyMay

    TonyMay New Member

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    How can something be very unique? It is either unique, or it isn't!
     
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  4. Davo

    Davo New Member

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    In the long run for 71000 to have new rollers on her and new tyres for its driving wheels , And the caprotti valve gear to new parts to say only 2 locos survive with caprotti valves the other 73129. But it will be worth it in 2020 when duke of gloucester is back the best out of the 2 caprotti,s and mainline certified, the standard 5 will have quite a wait in the overhaul queue at swanwick jct yet.
     
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  5. The Saggin' Dragon

    The Saggin' Dragon Part of the furniture Staff Member Moderator

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    Me too.
     
  6. Jamessquared

    Jamessquared Nat Pres stalwart

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    I think I’d cut a Norwegian a bit of slack in his use of English! Certainly better than most of our attempts at Norwegian, I suspect.

    Tom
     
  7. Big Al

    Big Al Resident of Nat Pres Staff Member Moderator

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    Just spotted this comment very late in the day. Was unaware of the plan to return the gear to its original specification. Whilst I know that sometimes a later modification can be an improvement sometimes what it does reveal is why the original was as it was. Have no idea which is which in this case but hopefully some sound engineering will prevail and all will be well again. It is a locomotive that deserves to return to the main line and will be useful if it does.
     
  8. Victor

    Victor Part of the furniture Friend

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    I'm sure it doesn't matter, most of us understood what our Norwegian friend was saying...........thank you for your contribution.......:rolleyes:
     
    Last edited: Apr 22, 2019
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  9. MellishR

    MellishR Well-Known Member Friend

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    I believe it's a case of differences in the cam profiles, giving slightly different valve events. They've decided after all that the originals were a bit better, but I don't think either set of profiles was bad. The beauty of Caprotti is that it allows optimum exhaust valve openings over the range of inlet cutoffs, rather than the exhaust and inlet events having a fixed relationship as you get with piston valves.
     
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  10. class8mikado

    class8mikado Member

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    Apologies i really dont remember the ins and outs, whether its reversing a change in Cam Profiles,Lifting Valve /Spindle profiles or just a reversion to original spec materials. One s suspicion is that whatever tweaks were made are now thought to be detrimental to the longevity/ reliability...
     
  11. std tank

    std tank Member

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    As long as they don't put the ashpan back to what it originally was!!
     
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  12. Spamcan81

    Spamcan81 Resident of Nat Pres

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    Before criticising someone's grammar, perhaps you should consider that 240P15's first language may not be English.
     
  13. Sheff

    Sheff Well-Known Member

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    Ditto the exhaust!
     
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  14. Hermod

    Hermod New Member

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    Where can I read about the exhaust before and after?
     
  15. Sheff

    Sheff Well-Known Member

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    Not sure but it was a standard Swindon double blast pipe originally. Now a Kylchap I believe.


    Sent from my iPhone using Tapatalk
     
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  16. Flying Phil

    Flying Phil Member

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    I think it is a double kylchap and the Duke does have a fantastic sound at speed - a real staccato, almost machine gun like beat.
     
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  17. Sheff

    Sheff Well-Known Member

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    Yes it's a double Kylchap.
     
  18. MellishR

    MellishR Well-Known Member Friend

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    It was described in "71000 Duke of Gloucester The Impossible Dream". Part 2 is available from the Trust but not the original booklet (which was not identified as "part 1"). Second hand copies may be available, but perhaps we should ask the Trust for a reprint.
     
  19. Jamessquared

    Jamessquared Nat Pres stalwart

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  20. sir gilbert claughton

    sir gilbert claughton Member

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    the original was , I think , a Derby confection which didn't work well

    it was sent to Swindon FAO Sam Ells . it returned from Swindon with (allegedly ) 2 Dean Goods chimneys ( and possibly blastpipes) stuck together . that didn't work either but it made a lot of noise and burnt a LOT of coal
    . Swindons interest in it seems to be somewhere south of low.

    5% cut off seemed to be a popular setting , probably to avoid running out of coal.

    I saw quite a lot of it - nobody seemed to want to clean it much either
     
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