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Smoke Deflector design and theory

Rasprava u 'Steam Traction' pokrenuta od Steve from GWR, 28. Svibanj 2010..

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  1. davidarnold

    davidarnold Member

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    More details here

    http://en.wikipedia.org/wiki/Milton_rail_crash
     
    davidarnold, 1. Lipanj 2010.
    #21
  2. Eightpot

    Eightpot Resident of Nat Pres Friend

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    The "Polar Star" incident happened around 1955 at Milton, just west of Didcot where an Up train took a crossover from the Main to the Slow lines too fast, derailed and went down an embankment. Lack of driver visibilityof signals was claimed as one of the reasons, hence the modification.
     
    Eightpot, 1. Lipanj 2010.
    #22
  3. Bulleid Pacific

    Bulleid Pacific Part of the furniture

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    Further evidence that the fitting of smoke deflectors is a compromise: its either smoke obscuring forward vision or the smoke deflector itself! However, I find it slightly strange that the Western and Midland region crews found forward visibility difficult on a 'Brit', when the Southern, Scottish and Eastern regions kept the deflectors as constructed. Were there any reports of similar visibility problems on the latter regions?
     
    Bulleid Pacific, 1. Lipanj 2010.
    #23
  4. Jimc

    Jimc Part of the furniture

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    As I'm sure just about all of you know on the Western visibility was compromised because the Brit had the driver on the "wrong" side...
     
    Jimc, 1. Lipanj 2010.
    #24
  5. Bulleid Pacific

    Bulleid Pacific Part of the furniture

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    ... Or the "right" side, as signals were generally still on the left on the Western region, depending on direction of travel. That should have improved visibility, if anything.
     
    Bulleid Pacific, 2. Lipanj 2010.
    #25
  6. 34007

    34007 Part of the furniture

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    If you look at Converted to Unconverted Bulleids. Isn't the smoke drawn further up into the air? Is this because the Smoke Defelctors stuck out alot more? I'm not a scientist by any stretch of the imagination!
     
    34007, 6. Lipanj 2010.
    #26
  7. Spamcan81

    Spamcan81 Nat Pres stalwart

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    As opposed to Chapelon who tried to keep his steam passages as straight and uncluttered as possible.
     
    Spamcan81, 7. Lipanj 2010.
    #27
  8. Spamcan81

    Spamcan81 Nat Pres stalwart

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    IIRC there was little problem with 2001 when first built as the sharper blast with the poppet valves threw the exhaust higher. It was the piston valve variety that had the problems and resulted in the A4 style wedge nose.
     
    Spamcan81, 7. Lipanj 2010.
    #28
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