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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. northernsteam

    northernsteam Member

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    Extremely impressed by the progress being made nowadays and the obvious careful thought given before each stage, well done to everyone and it shows the value of being 'in-house' at such a capable engineering company. My only small concern was the method of rotation used. Could chains not cause problems with edges of metal and/or stresses on the 'partially complete' assembly? But, as I say, there is so much pre-planning and preparation that I must be assured all is well. Will it be rotated the same way I wonder?
     
  2. ianh1

    ianh1 Member

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    Yes, I think I agree with you there. It has to be turned upside down prior to going to the hornguide machining station and then turned the right way up afterwards. We will have a discussion with CTL Seal as there should be a less stressfull way.
     
  3. Hermod

    Hermod Member

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    The chains ad compressive stress to the edges and that is a good thing.
    The round concave fillets on classy crankshaft are roller burnished to achieve same effect.
     
  4. Sheff

    Sheff Resident of Nat Pres

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    I doubt the two are comparable myself. The crankshaft has controlled pressure applied evenly over the chosen area, whereas the chains are stressing random small areas on a long edge.
     
    Last edited: May 26, 2019
  5. northernsteam

    northernsteam Member

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    True, my other concern was the shock loading onto the temporary fixings/struts when the chains 'slip' each link.
    I reckon the lads will have it sussed the next time.
     
  6. class8mikado

    class8mikado Part of the furniture

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    Continuous stream of activity on the website. Now stating that the tender is to be a BR1G...
     
  7. Sheff

    Sheff Resident of Nat Pres

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  8. ianh1

    ianh1 Member

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    The BR1G tender was announced at the last AGM in September. Primary reasons are the 5,000 gallon water capacity and the better rear vision. Hengist is likely to spend some of her time on preserved railways where rear running will be required. The cannon box design is close to completion. Alan and Keith have come up with a revised design to seal the ends of the axle. We've also dispensed with the central rectangular bosses on the cannon box - these were required for BR(W) ATC which is long extinct.
     
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  9. class8mikado

    class8mikado Part of the furniture

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    Should be possible to reduce the coal space and increase water cap even further. Roughly you lose a Ton for every 300 gallons.
     
  10. std tank

    std tank Part of the furniture

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    You will still need track detection equipment mounted somewhere between the frames, possibly on the front of the bogie and behind the front bufferbeam.
     
  11. ianh1

    ianh1 Member

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    Yes, it's drawing number SL/DN/O/625 Front Bogie Frame Stay & Receiver Carrier which is mounted between the bogie frames. You can see it in this photo http://fraserker.com/winson/britannia_pix/britannia/_mg_1558.jpg .Note that for 70000 Britannia, the circular frame stay immediately above it is still in place. For 71000, Duke of Gloucester, the front stay has been cut off immediately inboard of the circular bosses of the stay. It would be interesting to know why. Alan is creating a drawing for the 625 stay detailing the separate plates. This should be a relatively simple component to maunfacture. We have a AWS receiver in stock - not sure if it works.

    As the BR(W) ATC relied on a mechanical connection, I'm guessing that it needed to be mounted on the axle so that the distance between the track ramp and the locomotive contact shoe was fixed. AWS being inductive, the receiver can be mounted on the bogie frame. We also have the plate and surround that was fixed to the buffer beam to prevent the coupling link from damaging the receiver
     
  12. class8mikado

    class8mikado Part of the furniture

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  13. 240P15

    240P15 Well-Known Member

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    Hello.:)

    Just a little question. Does the building scheme of no.72010 'Hengist' include fluted coupling- and connecting- rods like the original 'Clans'?

    Knut
     
  14. class8mikado

    class8mikado Part of the furniture

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    100% Sure they will be the Later plain/ GWR style connecting Rods.
    Even though the replacement of rods on the original Clans was 'never got round to' in most cases, the drawings for the Clans, Duke and Brits incorporate the change
    One of the Idioms of the Clan project is to keep as close to the latest set of drawings as is possible, and the VAB have also advised on this.
     
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  15. 240P15

    240P15 Well-Known Member

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    Thanks for your reply. :)
    Personally I think fluted rods have a smarter look but that`s of course another issue;)

    Knut
     
  16. std tank

    std tank Part of the furniture

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    Coupling rods, plain.
    Connecting rods, fluted.

    PS class8mikado, have you seen the Letters page in the latest Steam Railway?
     
  17. jnc

    jnc Well-Known Member

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    Do you happen to know the rationale behind that? Thanks!

    Noel
     
  18. class8mikado

    class8mikado Part of the furniture

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    Rationale... erm dunno, the Coupling rods were always fluted, the connecting rods were changed because the fluted design was thought to have inadequate lateral bending resistance (which came out of the investigation of wheels shifting on axles incidents i think)

    Yes Standard tank i did thankyou. Love that model. I have a plan involving a various new components common to Clans ( including parts of boiler) wedded to 92245 to create 91000, change from a Million i reckon.
     
  19. Sheff

    Sheff Resident of Nat Pres

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    Think you’ve got your rods tangled their mate.
     
  20. oddsocks

    oddsocks Well-Known Member

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    Yes, it was the coupling rods that were changed, Not the connecting rods.
     

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