If you register, you can do a lot more. And become an active part of our growing community. You'll have access to hidden forums, and enjoy the ability of replying and starting conversations.

2874

Discussion in 'Steam Traction' started by jimbo, Jan 22, 2009.

Page 2 of 2
  1. gwr4090

    gwr4090 Part of the furniture

    Joined:
    Aug 8, 2005
    Messages:
    2,847
    Likes Received:
    222
    Gender:
    Male
    Occupation:
    Scientist (Rtd)
    Location:
    Dorset
    Driving wheelbase:

    45xx 11ft 6in small prairie
    5101 14ft 9in large prairie
    4073 14ft 9in Castle, Hall, Manor
    56xx 15ft 3in 0-6-2T
    57xx 15ft 6in pannier
    60xx 16ft 3in King
    28xx 16ft 10in 2-8-0
    42xx 20ft 0in 2-8-0T

    So not a great deal of variation apart from the 45xx (small) and 42xx (large)

    David
     
    gwr4090, Jan 24, 2009
    #21
  2. Corbs

    Corbs Well-Known Member

    Joined:
    Jul 17, 2008
    Messages:
    1,714
    Likes Received:
    727
    Hmm.. the Portishead Railway group are currently looking for a static steam engine to display at the proposed portishead station site...
     
    Corbs, Jan 24, 2009
    #22
  3. Jimc

    Jimc Part of the furniture

    Joined:
    Sep 8, 2005
    Messages:
    4,058
    Likes Received:
    4,685
    Occupation:
    Once computers, now part time writer I suppose.
    Location:
    SE England
    Heritage Railway Volunteer:
    No I do not currently volunteer
    FWIW the small panniers (54/64/74/16) were 14'8". Presumably wheel diameter would make a degree of difference, if only a few inches worth.
     
    Jimc, Jan 24, 2009
    #23
  4. Steve

    Steve Resident of Nat Pres Friend

    Joined:
    Oct 7, 2006
    Messages:
    11,977
    Likes Received:
    10,180
    Occupation:
    Gentleman of leisure, nowadays
    Location:
    Near Leeds
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Driving wheel size doesn't affect the stated wheelbase but it does have some effect on the ability to negotiate sharp curves as the angle of attack of the flange is greater with larger wheels. There's a lot more to things than just wheelbase, though. Sideplay on axles, reduced flange thickness and bogie/pony lateral movement are just a few that spring to mind. Interesting to note the coupled wheelbase of the 42XX. 5224 (and 4277 before it) has no significant problems on the NYMR with its 10 chain curves. I didn't think the curves on the WSR were that bad.
     
    Steve, Jan 24, 2009
    #24
  5. Kerosene Castle

    Kerosene Castle Well-Known Member

    Joined:
    Apr 2, 2006
    Messages:
    1,345
    Likes Received:
    0
    Location:
    Hell, aka Hull
    42's and the like have the benefit of a bit of extra play in the rods.
     
    Kerosene Castle, Jan 24, 2009
    #25
  6. Martin Perry

    Martin Perry Nat Pres stalwart Staff Member Moderator Friend

    Joined:
    Apr 15, 2006
    Messages:
    16,513
    Likes Received:
    7,764
    Location:
    1012 / 60158
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Isn't the angle of attack less with larger diameters?
    Weren't the 28XX known for having less than the average sideplay in motion/axleboxes etc?
     
    Martin Perry, Jan 24, 2009
    #26
  7. Steve

    Steve Resident of Nat Pres Friend

    Joined:
    Oct 7, 2006
    Messages:
    11,977
    Likes Received:
    10,180
    Occupation:
    Gentleman of leisure, nowadays
    Location:
    Near Leeds
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Well the chord length across the flange tangential to the tread is longer, the greater the diameter. Therefore for a given radius the angle subtended by the flange to the rail will be greater. That's as I understand it, anyhow. (How do you do a drawing on Nat Pres?)
     
    Steve, Jan 25, 2009
    #27
  8. jimbo

    jimbo New Member

    Joined:
    Sep 1, 2007
    Messages:
    114
    Likes Received:
    0
    3850 has proved to be an exellent engine , with no apparrent problems, also the most economical engine on the line!
     
    jimbo, Jan 25, 2009
    #28
  9. Kerosene Castle

    Kerosene Castle Well-Known Member

    Joined:
    Apr 2, 2006
    Messages:
    1,345
    Likes Received:
    0
    Location:
    Hell, aka Hull
    Yeah I'm not surprised, just needs another dozen more coaches behind it!
     
    Kerosene Castle, Jan 25, 2009
    #29
  10. Jimc

    Jimc Part of the furniture

    Joined:
    Sep 8, 2005
    Messages:
    4,058
    Likes Received:
    4,685
    Occupation:
    Once computers, now part time writer I suppose.
    Location:
    SE England
    Heritage Railway Volunteer:
    No I do not currently volunteer
    Were't the GWR known for having less play in *everything* [gdr].
    But according to Holcroft the 42s/52s had special arrangements because they were required to traverse 6 chain radius curves: Holcroft states he was responsible for designing a joint with spherical surfaces to permit horizantal and vertical movement of the trailing wheels.
    I've seen accounts that suggest that the capacity for handling curves was not replicated in the 72s...
     
    Jimc, Jan 25, 2009
    #30
  11. baldric

    baldric Member

    Joined:
    Jan 28, 2008
    Messages:
    312
    Likes Received:
    50
     
    baldric, Jan 26, 2009
    #31
  12. gwr4090

    gwr4090 Part of the furniture

    Joined:
    Aug 8, 2005
    Messages:
    2,847
    Likes Received:
    222
    Gender:
    Male
    Occupation:
    Scientist (Rtd)
    Location:
    Dorset
    Is this a reference to 3822 hauling 19 coaches on the WSR ?

    David
     
    gwr4090, Jan 26, 2009
    #32
  13. Kerosene Castle

    Kerosene Castle Well-Known Member

    Joined:
    Apr 2, 2006
    Messages:
    1,345
    Likes Received:
    0
    Location:
    Hell, aka Hull
    Could be, could be!
     
    Kerosene Castle, Jan 26, 2009
    #33
  14. gwr4090

    gwr4090 Part of the furniture

    Joined:
    Aug 8, 2005
    Messages:
    2,847
    Likes Received:
    222
    Gender:
    Male
    Occupation:
    Scientist (Rtd)
    Location:
    Dorset
    I gather that the two tightest curves on the WSR (just west of Watchet) are about 12 chains, and are well within the capabilities of the 42xx and 28xx classes.

    David
     
    gwr4090, Jan 26, 2009
    #34
  15. Kerosene Castle

    Kerosene Castle Well-Known Member

    Joined:
    Apr 2, 2006
    Messages:
    1,345
    Likes Received:
    0
    Location:
    Hell, aka Hull
    Surprised at that, I remember one or two that seemed particularly tight, but then I only get down there once in a blue moon!

    Oh well, a 72xx would soon sort out any track irregularities.

    Or vice versa...
     
    Kerosene Castle, Jan 27, 2009
    #35
  16. arthur maunsell

    arthur maunsell Well-Known Member

    Joined:
    Sep 6, 2008
    Messages:
    1,047
    Likes Received:
    140
    Location:
    by the fire
    Heritage Railway Volunteer:
    No I do not currently volunteer
    yep//it'll all be 7' 0 3/4" after that Mother gets at it....
     
    arthur maunsell, Jan 27, 2009
    #36
  17. jimbo

    jimbo New Member

    Joined:
    Sep 1, 2007
    Messages:
    114
    Likes Received:
    0
    Sorry Mr Maunsell, thats 7' 1/4'', we cant have our broad gauge engines falling through the track you know!
    There are a couple of tight points at Williton & BL . Pity about 2874, I'd like to have had here running here, though obviously a long term project.
     
    jimbo, Jan 28, 2009
    #37
  18. arthur maunsell

    arthur maunsell Well-Known Member

    Joined:
    Sep 6, 2008
    Messages:
    1,047
    Likes Received:
    140
    Location:
    by the fire
    Heritage Railway Volunteer:
    No I do not currently volunteer
    are now what difference does 1/2" make? (a hell of a lot according to my missus....
     
    arthur maunsell, Jan 28, 2009
    #38
Page 2 of 2

Share This Page