Radius again.

Discussion in 'N / Z Scale Model Trains' started by plbab, Jan 31, 2003.

  1. plbab

    plbab Member

    I have 2 foot wide modules will i only be able to get 11 inch curves? I am working in N scale. If i use a yard stick and put a pencil at 11 inches will that give me a 11 inch radius? Paul
  2. Drew1125

    Drew1125 Active Member

    11" radius curve will make a circle 22" in diameter ...& that's about as wide as you can safely turn a train in a 24" space...in fact, even then those trains are really going to be hugging the edge of that table...remember - the curve radius is a measurement of the track;s centerline . (the point halfway between the rails)
  3. 60103

    60103 Pooh Bah

    you need 2 points to get a radius. Unless you have a yardstick with extra wood befow the first inch, you will need to put a point (nail, push pin, ) in a bit from the end (I drill a hole at the 1" mark) and drill another hole for a pencil at the 12" mark (11"+1").
    I also make two extra holes beside the nail hole to mark either rail position or end of ties.
    I also make extra pencil holes for more radii.
    If you're not going over 11", you might get away with using a foot ruler; yardsticks tend to bash against the walls.
    I agree with Charlie about the radius being a bit close to the edge. If it's against a wall, you may find long cars or locomotives hitting the wall.
  4. Sir_Tainly

    Sir_Tainly Member

    How very timely:) I was going to post a question about radus measurements..but that clears it up for me..the radius is measured via the outside rail :)

    thanks (even if you didn't know you were helping ;))

  5. 60103

    60103 Pooh Bah

    Radius is measured to the centerline of the track. This lets you make reverse curves without making allowance for the gauge.
    (Exception: Lionel measures diameter over the outside of the ties/sleepers.)
    Laying out the extra lines that I suggested just makes tracklaying easier.
  6. Sir_Tainly

    Sir_Tainly Member

    Thanks David,

    so in fact my 12" radius curves if laid in a 180 degree arc would take up 24" + the width of the track (9mm or approx 3/8") .

    Good to know this before I start squeezing my flexitrack onto the back of an old door :)

    I was planning to start building the base of my new layout last weekend but I wanted to work outside to saves vacuuming up polystyrene bobbles ;) ) but it snowed :mad:


  7. billk

    billk Active Member

    Or + the length of the ties, or + the width of the roadbed you're using. (Depending on what you're willing to have hanging over the edge - hopefully nothing!)
  8. Sir_Tainly

    Sir_Tainly Member

    ahy good point :D I'm using Woodland scenics road bed..or will when it arrives I have it on back order with the stockist..suddenly the vast expanse I seemed to have gain by going "N" seems to be shrinking ;) Why do I have to live in a shoe box ??? A most railroad unfriendly house :(
  9. swissjohn

    swissjohn Member

    For "shoe box" read......."An average British home"
    I too have the same problems your Lordship :D :D
  10. Sir_Tainly

    Sir_Tainly Member

    Hi John,

    actually mine is on the small side as it's only 2 bedroom..a side effect of having to live in the most expensive place for houses in the UK, outside London :( Still at least it means I can work and have money for trains ;) (even if I lack space to use them ;) )


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