Templot Club Archive 2007-2020
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posted: 23 Mar 2013 19:04 from: David Gover
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I am having to design a layout in a rather cramped space. Can anyone point me to a reference within Templot or elsewhere to the minimum practical radii, when working in 3mm scale to 14.2mm gauge - both for running lines using 62ft stock and for sidings? I do not really want to have wide toy train gaps between vehicles. Regards David |
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posted: 23 Mar 2013 21:09 from: Rob Manchester
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Hi David, Iain Rice suggests 2 ft 9 inch for main line and 2 ft 3 inch for Secondary lines as a minimum radius for 3mm scale in one of his books. If you have a coach you could try drawing curves of these sizes and seeing how the coach looks when placed on them. Rob |
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posted: 23 Mar 2013 21:33 from: Martin Wynne
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Hi David, Welcome to Templot Club.  The 3mm Society very likely have a manual giving such guidance: http://3mmsociety.org.uk Almost any stock can be got round any curve -- it depends what special measures you are willing to take. First comes gauge-widening, and then perhaps modifications to buffers and couplings, bogie clearances, etc. For the exact-scale gauges, FM, S3, P4, etc., a useful guide is the 4 chains rule. i.e. below 4 chains radius you are likely to need such special measures to get stock round. Above 4 chains radius most stock will run as-is. A chain is 66ft, 4 chains is 264ft, and in 3mm/ft scale that is 792mm = 31" (2ft-7in). regards, Martin. |
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| Last edited on 23 Mar 2013 21:34 by Martin Wynne |
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posted: 24 Mar 2013 01:23 from: Nigel Brown click the date to link to this post click member name to view archived images |
Martin Wynne wrote:Hi Martin I've just replied in detail to David's parallel enquiry on the 3mm Society's egroup. However, just thought I'd say your 4 chains rule seems spot on. I aim for 40", am happy for it to drop to 36", and find that 32" is still OK (for simple curves; reverse curves are a different matter). On tests on sharper curves I've found problems at 28" - 29", so 31" - 32" seems a good absolute mininum to use. Nigel |
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posted: 24 Mar 2013 12:26 from: GeoffJones
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Hi David There are three considerations: What will stock negotiate? This has been well covered by others.Long vehicles on sharp curves show a lot of overhang so such curves although they might be OK for actual operation can look bad in visible areas. You also need to allow a little extra space between tracks on such curves as the end of a long vehicle on the inner curve can scrape the centre of similar one on the outer curve. Unless you are using couplings with integral buffing, buffer locking can be a problem with dissimilar length vehicles on plain curves and any vehicles on reverse curves. eg a fairly long loco shunting wagons. There are some photographs that illustrate most of these situations, particularly the buffer locking, together with a page of explanations and figures in "Track How it Works and How to Model It" published by the 2MM Scale Association. Regards Geoff |
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posted: 26 Mar 2013 02:47 from: Terry Flynn
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Have a look at the AMRA minimum radius standard. I covers all scales and most prototypes. Terry Flynn AMRA standards http://www.amra.asn.au/standards.htm |
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