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Discussion in 'Steam Traction' started by richard67, Jul 22, 2012.

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  1. 2857Harry

    2857Harry Well-Known Member

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    Well at one point I was lead to believe it was going Tuesday with 57003. But that’s now gone from a 5Z to 0Z path so maybe it’s just the 57.
     
    2857Harry, May 25, 2025
    #181
  2. Sidmouth

    Sidmouth Resident of Nat Pres Staff Member Moderator

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    the inital restoration more than highlighted what a capable steam raiser the boiler was with the damper openings of the right dimensions and a Kylchap produced a fantastic engine . Subsequently further development took place on the Cams with a revised camshaft to improve performance further

    I think it was said that this overhaul the plan was to revert back to the original camshaft but whether that has happened I don't know
     
    Sidmouth, May 25, 2025
    #182
  3. huochemi

    huochemi Part of the furniture

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    BR testing was done in 1954. Test reports in general were more aimed at operating the locos within likely service parameters rather than establishing maxima. (the V2 test report was done in connection with its re-draughting at Swindon so they did want to see what it could do). That for 71000 is rather different from the others as it seems to have a greater focus on costs and optimal operating parameters (and to a limited extent, a comparison with diesel 10203). I doubt there were many, if any, BR services that required 30,000lbs/hr of steam and to generate this quantity is probably beyond the expected limit for one fireman. I suspect 71000 could produce more than this, 32,000lbs is mentioned although that is not enormous for such a large boiler. The report states that there was adequate air supply (indeed, a 30% excess) to burn the coal fully (the amount of air apparently being derived from an analysis of the exhaust gas quantities).
     
    huochemi, May 26, 2025
    #183
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  4. Hermod

    Hermod Well-Known Member

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    Fireside of flues and tubes are identical for BR standard 7 and 8.
    Firebox surface area of BR 8 is 8% bigger and grate area 16% than BR 7.

    Mr Giesl has made a formula for calculating max steaming as function of evaporating surface and grate area when burning a coal like Blidworth.
    His method estimates max evaporation from BR7 to 29000 lbs per hour and 33500 for BR8

    BR measurements according to Cox were 30000 for BR 7 and 29000 from BR 8 originally.
    A reasonable estimate of Duke Max Steam in present oppened up state is thus 34500lbs per hour and 2800 indicated horsepower at most frugal point.

    A Britania and a Clan with Caprottis will be nice to race again the Duke over Shap with train masses proporttional to empty mass of locomotives.
     
    Last edited: May 27, 2025
    Hermod, May 26, 2025
    #184
  5. Sheff

    Sheff Resident of Nat Pres

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    A Clan with Caprotti? I doubt we’ll ever see that, the new build has piston valves.
     
    Sheff, May 26, 2025
    #185
  6. Johnb

    Johnb Nat Pres stalwart

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    A question on your last para, what would be the point?
     
    Johnb, May 26, 2025
    #186
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  7. Hermod

    Hermod Well-Known Member

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    Investment in a steam locomotive depends on amount of metal used?
    When my B16/4 is ready to prove that I am best locomotive engineer alive,it will be fair to strain locomotives with trains proportional to loco mass.
     
    Last edited: May 27, 2025
    Hermod, May 26, 2025
    #187
  8. ghost

    ghost Part of the furniture

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    Good to see that you have your ego in check...
     
    ghost, May 26, 2025
    #188
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  9. Sidmouth

    Sidmouth Resident of Nat Pres Staff Member Moderator

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    not sure where you get your figures from but from its test run in march 1990 the boiler was producing around 45000 lbs per hour with the boiler steaming against both injectors and safety valves lifting with 507 tons on the five miles of Heeley bank. DH Landau calculated rates up to 48000 lbs per hour with 42000 lbs per hour sustained over nine minutes when 71000 took the blue riband on the S&C in July 1991
     
    Sidmouth, May 26, 2025
    #189
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  10. Steam Valley Productions

    Steam Valley Productions New Member

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    Some action from Saturdays test run




    Sent from my iPhone using Tapatalk
     
    Steam Valley Productions, May 26, 2025
    #190
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  11. 2857Harry

    2857Harry Well-Known Member

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    To confirm 71000 leaves today being towed to Crewe by 57003
     
    2857Harry, May 27, 2025
    #191
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  12. LMS2968

    LMS2968 Part of the furniture

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    I'm struggling a bit with those figures and wonder how they were obtained. Stanier Pacific 6225 in 1955 and 1956, both on the rollers at Rugby and with the MTUs over the S&C gave a maximum output of 41,500lb/hr. This wasn't the boiler's maximum ability but the maximum the engine could use: above this slipping became uncontrollable and the engine - and boiler - had to be eased. The test crew decided on a nominal maximum output for the boiler at 42,000lb/hr.

    In view of this, I wonder how a maximum of 48,000lb/hr was achieved from 71000, or 42,000lb/hr sustained for so long without the engine losing its feet?
     
    LMS2968, May 27, 2025
    #192
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  13. Hermod

    Hermod Well-Known Member

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    Cox states that 46220 could produce max 36000 lbs per hour steady state and the Giesel model says 33500 if burning a Blidworth like fuel.
     
    Last edited: May 27, 2025
    Hermod, May 27, 2025
    #193
  14. RalphW

    RalphW Nat Pres stalwart Staff Member Administrator Friend

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    Seen at Bescot.

    Screenshot (73).png
     
    RalphW, May 27, 2025
    #194
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  15. 2857Harry

    2857Harry Well-Known Member

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    2857Harry, May 27, 2025
    #195
  16. Chris86

    Chris86 Well-Known Member

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    Did it leave the SVR with motion on?

    Hope they haven’t had an epic en route.

    Chris
     
    Chris86, May 27, 2025
    #196
  17. Sidmouth

    Sidmouth Resident of Nat Pres Staff Member Moderator

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    Yes
     
    Sidmouth, May 27, 2025
    #197
  18. Steve

    Steve Resident of Nat Pres Friend

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    Judging by the coupling rod sitting on the floor, I guess they have.
     
    Steve, May 27, 2025
    #198
  19. Chris86

    Chris86 Well-Known Member

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    Scotch missed- didn’t spot that on a phone screen.
     
    Chris86, May 27, 2025
    #199
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  20. goldfish

    goldfish Nat Pres stalwart

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    goldfish, May 27, 2025
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