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BR Standard class 6 No. 72010 'Hengist' and Clan Discussion Thread

Discussion in 'Steam Traction' started by Bulleid Pacific, Nov 23, 2009.

  1. Jamessquared

    Jamessquared Nat Pres stalwart

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    I'm sure there is workplace politics at play as well - after all, it would be remarkable if (in the case of BR) you had an organisation with probably close to a dozen major workshops and four competing design offices that didn't have major arguments on policy about new designs. I think there is a tendency from an enthusiast point of view to imagine that you are starting from a clean sheet of paper and set out the ideal designs: life is much messier than that. It would hardly be beyond the bounds of possibility were some design element to be accepted as a compromise to keep one or other of the regions "on side".

    Tom
     
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  2. Eightpot

    Eightpot Resident of Nat Pres Friend

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    And there we were trying to understand the logic in Ireland of taking an average of the gauges in use there, and ending up with 5' - 3"!
     
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  3. ianh1

    ianh1 Member

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    Coming back to the original question on patterns (!) the drawings for or engine state that "Pattern to suit SL/DE/20095 finished size of which is shown by etched lines". 20095 is the class 5 drawing.

    Other news is that our pattern maker, Tony, is back up to speed again and is about to start the valve cylinder core box. Whereas the main cylinder core is essentially straightforward, the valve cylinder internal shape is a lot more complex. We are finalising the changes connected with the move to direct oil lubrication as recommended in the CLIP report

    https://www.theclanproject.org/design/Clan_Design_Clip.php

    See section 5. The lubrication hole will be moved outwards slightly to ensure that the oil is injected at the mid point of the piston. In order to ensure that the pattern can be used for class 7 locos with atomised injection, the internal gallery will be retained. An internal boss will be added, similar to the liner bolt location boss, so that oil is fed direct to a hole in the liner.
     
  4. Sheff

    Sheff Resident of Nat Pres

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    Thanks Ian, great to hear that these best practice features are being incorporated. I’m sure we will reap the benefits when it comes to operating the loco.
     
  5. ianh1

    ianh1 Member

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    Help Needed!

    20240513_121323.jpg
    Yesterday we took a delivery from Forrest Engineering in Glasgow. These castings had been ordered a long, long time ago and Forrest were having a clear out and sent them to us. We think the casting marked 19 or 61 is the body for the graduable steam brake valve along with the handle and bottom lid (73). Other parts may be from the valve. The casting top left is foxing me unless its the top half of the valve and would be the other way up. Our problem is that we don't have the drawing. Can anyone confirm my thinking?
     
  6. jbg

    jbg New Member

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    upload_2024-5-14_16-13-37.png it is the top of the steam brake mechanism
     
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  7. ianh1

    ianh1 Member

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    Thanks
     

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