Can anyone advise on what instances require a 12:1 gear arrangement?

Discussion in 'Power Houses' started by York Paul, Jul 4, 2019.

  1. York Paul

    York Paul Staff Member Moderator

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    Just a general interest question to satisfy my morbid curiosity but what factors would necessitate installing at 12:1 gearing ratio in an O Gauge loco and what are the advantages of such? Also what scale speeds on the flat could be attained by say a Warship class loco hauling a rake of 10 coaches with such a gear arrangement fitted? Thanks for any pointers and help from members. :thumbs:

    cheers Yorkie
     
  2. SBt

    SBt Full Member

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    Unless you're racing one at Santa Pod or modelling a Bullet Train, non as far as I'm aware.
     
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  3. paul_l

    paul_l Staff Member Administrator

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    From Tower Models site the following applies

    Model Number Length Rated Speed (r.p.m)
    1824 24mm 9200
    1833 33mm 8500

    Based on the tyre size of dia 25mm (Class 26 / 27) giving an approx circumference of 80mm (78.55 actually) then at max speed of an 1833 motor distance traveled per min = 8500/12 x 80 = 56667 mm per min and for scale speed would be 56667 x 43.5 = 2465 m per min converts to 91mph (google was my friend on that one).

    Does that help o curious one

    Paul
     
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  4. York Paul

    York Paul Staff Member Moderator

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    :avatar::avatar::avatar: thanks chaps... now that would be a sight for sore eyes in anyone's book watching an NBL class 22 do a scale speed of 91mph through the rhododendron bushes:facepalm:
     

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