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Stanier Princess Royal & Princes Coronation Pacifics

Rasprava u 'Photography' pokrenuta od neildimmer, 9. Svibanj 2024..

  1. neildimmer

    neildimmer Resident of Nat Pres

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    I have added some new photos of Stanier's Princess Royal class in the BR era
    This collection features 46200 & 46201 built in 1933

    https://railway-photography.smugmug...46204/620046200-The-Princess-Royal-/i-24HS2CQ

    Neil
     
    Last edited by a moderator: 6. Lipanj 2024.
    neildimmer, 9. Svibanj 2024.
    #1
  2. neildimmer

    neildimmer Resident of Nat Pres

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    neildimmer, 17. Lipanj 2024.
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    keith6233 se sviđa ovo.
  3. Fred Kerr

    Fred Kerr Resident of Nat Pres Friend

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    58 / 63 = Carnforth
     
    Fred Kerr, 19. Lipanj 2024.
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  4. ssk2400

    ssk2400 New Member

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    Hi does anyone know why Princes Victoria has a a different motion bracket ?
     
    ssk2400, 21. Lipanj 2024.
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  5. huochemi

    huochemi Part of the furniture

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    The front end of the Princess frames was prone to cracking (all or nearly all eventually had a whole new section welded on) and, perhaps inspired to create room inside for increased bracing together with reducing preparation and maintenance time, it was decided to experiment with operating the inside valves with rocker arms from the outside valves, the drive being from the front of the outside valve chests, which was akin to a mirror image of the GWR arrangement. The Duchesses had already appeared by then and they had a more elegant arrangement with the drive taken from the rear of the outside valve chests and no enormous motion bracket.

    I think a problem with the Princess conversion was the relative position of the cylinders (the inside cylinders were a long way ahead of the outside), and the inside and outside cylinders had different inclinations (the inside cylinders were horizontal, the outside 1 in 35). The large motion bracket seems to have been required because of concerns with beefing up the valve gear to drive the two sets of valves, and it is possible that it may have been designed with one eye on providing some frame stiffening. The modification is described in the Wild Swan Locomotive Profile book, which has a (small) copy of drawing D37-15117. (the full size version supplied by the NRM is so large that the lights will dim in the neighbourhood when you open it up)
     
    huochemi, 22. Lipanj 2024.
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  6. RLinkinS

    RLinkinS Member

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    The outside valve gear operated the inside valves by rocking levers so there was more load on the outside valve gear than the other Princess class locos

    Sent from my SM-A105FN using Tapatalk
     
    RLinkinS, 22. Lipanj 2024.
    #6

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