## building a helix in oo

### building a helix in oo

hi there could anyone give me details on how to build a helix in oo scale it is only to drop down just under my layout so that i can get a fiddle yard in my layout! I would use another one at the otherside of the layout to bring it back up to normal level, just need the sizes for it! i would like to have two tracks on it if i could!

Thanks G

Thanks G

- Ironduke
**Posts:**879**Joined:**Mon Sep 26, 2005 12:04 am**Location:**Ballarat Victoria Australia-
**Contact:**

there's the Noch helix kit but basically you just need to cut identical circles from plywood or mdf and form them into a helix using some vertical struts and then lay flexible track up it. You can make it any size you want as long as the incline isn't too steep and the radius isn't too tight for your trains

here's the link for the Noch solution anyway Gaugemaster - Noch helix thingy

and some more links

http://www.duff-family.demon.co.uk/railway/souecl.html

http://mywebpages.comcast.net/blainestr ... ewSLF.html

http://www.atlasrr.com/Layoutphotostuff ... lix-01.jpg

http://www.modellbau-menninghaus.de/fer ... ge0_gr.jpg

here's the link for the Noch solution anyway Gaugemaster - Noch helix thingy

and some more links

http://www.duff-family.demon.co.uk/railway/souecl.html

http://mywebpages.comcast.net/blainestr ... ewSLF.html

http://www.atlasrr.com/Layoutphotostuff ... lix-01.jpg

http://www.modellbau-menninghaus.de/fer ... ge0_gr.jpg

Regards

Rob

Rob

i may be getting the maths wrong here

but.. if you are looking for the circle to come fully round and under itself

and you are working to a 1:30 gradient then to drop 100mm.. [which is a good clearance and some]

the circumference of the circle must be 3000mm

as we know from school [ ] the circumference of a circle is 2*pi*R

therefore the diameter would be

(3 000 millimeters) / pi = 0.954929659 meters

may as well say a meter!

ha, maybe someone else can confirm that.. its been a while since i did any maths like that at school

michael

If its any help, this supplier himself makes and sells helix loops suitable for "00"/"H0" or "N" gauges. Worth a phone call to see what his prices are perhaps?

http://www.modelshopuk.com/

mumbles wrote:as we know from school [ ] the circumference of a circle is 2*pi*R

therefore the diameter would be

(3 000 millimeters) / pi = 0.954929659 meters

may as well say a meter!

ha, maybe someone else can confirm that.. its been a while since i did any maths like that at school

michael

or pi*D even oh and the maths looks solid !

Is my tortured brain right in thinking that a helix loop would not be a true circle by reason of the differential height of the ends ? who knows the maths for that ? !! - not me for one !

EDIT : I thought Chris Raider was planning one of these ?

mumbles wrote:hi

i may be getting the maths wrong here

but.. if you are looking for the circle to come fully round and under itself

and you are working to a 1:30 gradient then to drop 100mm.. [which is a good clearance and some]

the circumference of the circle must be 3000mm

as we know from school [ ] the circumference of a circle is 2*pi*R

therefore the diameter would be

(3 000 millimeters) / pi = 0.954929659 meters

may as well say a meter!

ha, maybe someone else can confirm that.. its been a while since i did any maths like that at school

michael

Note that this should be the radius of the inner track. You should widen the cut to match the width of any other tracks.

Pete

Once an engine attached to a train, was afraid of a few drops of rain...

- headshot119
**Posts:**311**Joined:**Sun Feb 11, 2007 3:47 pm

Note that this should be the radius of the inner track. You should widen the cut to match the width of any other tracks.

actually, it is the diameter

and we'll rounded off to 0.95m

this would be as you say the centre line of the inner track [assuming double track]

something like this i think;

however

if you built it to these measurements you would still want to test before fixing permanently

with the 100mm clearance there is some room for reducing the gradient if needed

it is also worth adding that gradients may need to be shallower on curves due to the extra friction caused by wheels going around curved track [ i think its friction that causes it]

michael

### Re: building a helix in oo

Now all this math is great, but after thats all taken care of....

I'm going to use threaded bar for the risers, thats makes it easy to adjust for a get smooth gradient

BUT how do we join each section of the helix to the next?

I'm going to use threaded bar for the risers, thats makes it easy to adjust for a get smooth gradient

BUT how do we join each section of the helix to the next?

Frolly from Derby

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