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  1. #11
    Join Date
    Apr 2005
    Location
    Sparland, Illinois
    Age
    64
    Posts
    1,693
    Blog Entries
    41
    There are lots of ways up the mountain...each with their own advantages and disadvantages.

    Easy Helix offers a stacked, cylindrical-shaped helix in kit form. I believe theirs is intended for HO but could easily be used for N scale. The one on their website has a 68" outside diameter with 2.1 and 2.3 percent grades that rise 2, 6, 10, 14, or 18 inches (more in 4 inch increments). Their stacked helix takes up 32 square feet of real estate and, at 4.5 turns for $230 + shipping, might seem too pricey to some modelers, but worth it for others who don't want to do their own design and component construction.

    This calculator is designed to help N-scalers who want to build their own bowl-shaped helix to fit their personal givens and druthers. It automatically determines critical dimensions for a bowl-shaped helix as a function of the specific preferences entered by the modeler. With judicious use of grades before and after the helix, it is possible to rise a considerable distance without going beyond a 48 inch diameter (i.e., the helix footprint could fit in a 4 ft by 4 ft space--16 sq ft). The entire ramp and a 4x4 ft support base panel could potentially be cut from a single 4x8 sheet of plywood and the vertical supports and tangent ramps from another 4x8 sheet...perhaps $100 for a 5 or 6 loop bowl-shaped helix.

    Take a look at my blog entries on bowl-shaped helix construction and at Hemi's and Cleggie's threads on their layout construction.
    Dave H.
    Modeling the 1970s era Peoria and Pekin Union Railway in N-Scale
    My Albums
    My Blog

  2. #12
    Join Date
    Dec 2008
    Location
    Green Mt State
    Posts
    92
    Great table!

    Gives me something to work with as far as working out the "future" layout.

    No more "estimating".

    :thumbs_up::thumbs_up::thumbs_up::thumbs_up::thumb s_up:
    Bob

    I can feel my sanity slipping... I think my brain needs traction tires...

    Been there, done that:
    O, S, HO, N... not going any smaller...

  3. #13
    Join Date
    Dec 2008
    Location
    Green Mt State
    Posts
    92
    Oh, and guys, your "helixi" look awesome!

    Never thought of building it in the workshop either!!!

    Nice work!
    Bob

    I can feel my sanity slipping... I think my brain needs traction tires...

    Been there, done that:
    O, S, HO, N... not going any smaller...

  4. #14
    Join Date
    Nov 2006
    Location
    Kuala Lumpur, Malaysia
    Age
    39
    Posts
    31
    For those looking for traditional stacked helix, I have created a calculator for that. Download from http://www.savefile.com/projects/808751807.

    You can calculate for single track or double track helix. PM me if you need clarifications.
    Jimmy Low
    Kuala Lumpur, Malaysia
    Blog: Rosenberg Meet in N-scale

  5. #15
    Join Date
    Aug 2007
    Location
    SE Michigan
    Posts
    0
    My spiral helix. I had the room and did not want a stacked helix on the mainline, so ended up with this. It's going to be fun to scenic.


    See ya
    Larry
    http://www.trainboard.com/railimages...r/8745/cat/500

  6. #16
    Thanks for the information Dave. This will help me make some decisions.

    Olddogg60

  7. #17
    I did my file to ease that computing: Untitled Document (well, actually it is for metric system - you know I'm from Europe!). If you want, you can download the file

    Conversion.zip


    Ciao

  8. #18
    I did my file to ease that computing: how to download and use the file (well, actually it is for metric system - you know I'm from Europe!). If you want, you can download the file

    Conversion.zip


    Ciao
    Last edited by jgiovenni; November 29th, 2009 at 03:34 PM. Reason: insert the correct directory/file name

  9. #19
    Join Date
    Nov 2010
    Location
    Leicestershire, UK
    Age
    38
    Posts
    6
    Great information, It will help with designing for my next layout.:thumbs_up:
    Last edited by Andrew Peters; November 7th, 2010 at 12:30 PM. Reason: can't spell

  10. #20
    aflex Guest
    Hi Dave,

    This is Very nice post on calculating spiral helix dimensions. And I think by reading this post anyone can understand what is the main difference between spiral helix and oval helix is. And how is it works. So I hope you will be continuing with such informative posts.

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