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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. 'Clan' Hengist

    'Clan' Hengist New Member

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    Clan chimney comparisons x2b medium.jpg
     
  2. class8mikado

    class8mikado Well-Known Member

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    I read it as the potential to move the results closer to the theoretical optimum didn't justify the potential extra cost. ( or potential fallout over appearance change) but unnecessary all the same
    Beauty is in the eye of the beholder and the images ive seen of a double chimney Clan we're fine (not as tall as the ones you've posted), just not very 'Clan like'. Agreed that the Modified Single chimney is very much Baby Brit, better than the original Horwich style pot though it looks odd on these
    Like the look of the tender (like the dukes ?)on these mock ups... the elongated lines really suit.
     
    Last edited: Feb 9, 2016
  3. 'Clan' Hengist

    'Clan' Hengist New Member

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  4. northernsteam

    northernsteam Member

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    I did find this very interesting Bob, in fact the whole recent discussion has been interesting thank you.
    So is that how we can expect the finished article to look?
    The enhanced single chimney does look a little strange though but if it improves the draughting etc then fine.
     
  5. class8mikado

    class8mikado Well-Known Member

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    All good stuff this sand printing, fingers crossed
    fingers crossed also that the strange looking single chimney is down to the tools available to the artist rather than the design itself...
     
  6. std tank

    std tank Part of the furniture

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    It is interesting to note that the spider is dimensionally different to the spider on a Britannia in some places and it is not just the smokebox radius that is different. There are different dimensions on the centre chamber and the position of the exhaust steam pipe flange.
     
  7. Smokestack Lightning

    Smokestack Lightning Member

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    I may be making this up, but did I read a while ago that the next batch of Clans were due to have double chimneys? If so shouldn't Hengist have one?

    I actually think that it looks very handsome, although obviously a bit different to the first ten.

    Dave
     
  8. 'Clan' Hengist

    'Clan' Hengist New Member

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    upload_2016-2-9_18-23-47.png

    This is the expected profile of the new chimney as provided by ASTT. Not quite the same as that in the mock up. It is a slightly larger diameter (hardly noticeable), and a half inch lower to meet the modern loading gauge.
     
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  9. std tank

    std tank Part of the furniture

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    Lot 242 was listed on all the component drawings for a single chimney and blastpipe, until the order was cancelled. It was then erased, but is, of course, mentioned in the alterations column of each drawing.
     
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  10. class8mikado

    class8mikado Well-Known Member

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    Be interested to know where you heard that one Mr lightning -The usual form would have been to stick one on one loco first and see how that went.
    Perhaps because the Clans weren't great steamers straight from the box ( and the original chimney dimensions are a little odd iirc) its an obvious connection to make, but the same blastpipe tweaks that were applied to the Standard 5's worked well enough - and they were not given double chimneys .

    Think Mr Std Tank is going to have to change his name to Non Std tank or Mr spot the difference... Why on earth would they make this part different for the sake of Cylinders lined up by half an inch.
    Perhaps Clan project should seriously look at adopting the Britannia dimensions otherwise replicating those Britannia indicator cards might end up as wishful thinking... and there's more room for a ....
    Better shut up or I might end up tied to the Rails in front of 72010 when Bob takes her for the inaugural spin
     
  11. detheridge02

    detheridge02 New Member

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    We have scoured every available drawing and document and no mention has been found of double chimney Clans. I must admit, and not wishing to stir controversy, I do like the look of the double chimney Clan. As Bob says more a baby Duke than Brit but it doesn't half make the loco look sleek!
    Keep an eye on the website, Facebook, Twitter and here. 2016 is already proving to be a year of great progress and with help we can bring a (21st century) Clan to the UKs railways!
     
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  12. std tank

    std tank Part of the furniture

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    Doncaster Works drawing office drew up designs for double blastpipes and chimneys for the Std 5 4-6-0s and Std 4 2-6-4 tanks. Neither Class had any fitted.
     
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  13. MellishR

    MellishR Part of the furniture Friend

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    A Std 4 2-6-4 tank with a double chimney would be a sight to see: one more stage in the evolution of the design from the Fowler original.
     
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  14. northernsteam

    northernsteam Member

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    Much better profile Bob, thanks for that. Now I can get my model made.
     
  15. Pesmo

    Pesmo Active Member

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    That exhaust spider design looks lovely, just like a modern motorsport engine inlet manifold. Now if only there was a flowbench somewhere that was big enough to optimise and balance the steam flow through it :)
     
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  16. philw2

    philw2 Member

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    Maybe Riccardo's would take a look at the flow optimisation if they were asked nicely..
     
  17. class8mikado

    class8mikado Well-Known Member

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  18. northernsteam

    northernsteam Member

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    This piece has me intrigued.
    Where does the boiler fit on this, not in that curved saddle halfway down the stretcher I assume?
    We are certainly gathering some pieces of metal lately. Looking forward to seeing them all fixed together!
     
  19. class8mikado

    class8mikado Well-Known Member

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    Think they are two separate bits and the curved section sits atop the other / what has me intrigued are the wavy edges, to clear a row of bolts securing something else i'd guess...
     
  20. northernsteam

    northernsteam Member

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    Thanks for that, I did wonder as I seemed to remember a pic of it in the correct alignment, on the CAD layout earlier.
    I think you may well be correct re the wavy edges but remember that when fitting a row of bolts/rivets between two fixed faces it is better to have a little bit of flexibility at each fixing than a straight plate as it would be if it were an angle edge. I imagine that these edges will be machined to fit precisely between the aligned frame plates, which is where the expertise/cost/time comes in with modern engineering. I wonder how they did it in 1952?
     

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