Templot Club Archive 2007-2020                             

topic: 140Crosssovers on curves - minimum radius
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posted: 25 Aug 2007 10:05

from:

Peter Salathiel
 
Bangkok - Thailand

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Hi Martin,

I've just come across your post http://groups.yahoo.com/group/handlaidtrack/message/5700

re. minimum radius/ turnouts for HO gauge.

Could you please provide similar data for 00-SF?

I am modelling Bridgend circa 1955. It has a couple of double junctions on curves.  I was planning on using #8/#9 switches on 33" radius curves. Too tight?

Best Regards

Peter

posted: 27 Aug 2007 22:46

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Peter Salathiel wrote:
I've just come across your post

 http://groups.yahoo.com/group/handlaidtrack/message/5700

re. minimum radius/ turnouts for H0 gauge.

Could you please provide similar data for 00-SF?
Hi Peter,

00-SF is a variation on EM, so generally EM practices apply. In EM the minimum radius is usually recommended to be in the 33"-36" range, at least for steam locomotives. With say 30" as the workable minimum.

If you are using only 00 gauge RTR models, these should normally negotiate curves down to about 18"-20", although they look a bit silly doing so, and are likely to have had chunks omitted to allow bogies and pony trucks to swing clear. If you change to scale buffers and couplings, these are unlikely to be workable at such tight radii.
I am modelling Bridgend circa 1955. It has a couple of double junctions on curves. I was planning on using #8/#9 switches on 33" radius curves. Too tight?
A B-8 in 00-SF on 33" radius (838mm) has a turnout curve of only 565mm (22"), so is definitely in the RTR range. I would normally say if you are placing a turnout on the inside of a tight curve it should be at least a C-10, and on a curve as tight as 33" probably at least a D-12 or E-16. Those give turnout curves of  639mm (25"),  689mm (27") and 747mm (29") radius respectively. Those are very long turnouts, it would probably be better to try to ease the 33" if you can.

You can ease the turnout curves a little by changing from a "regular" type of V-crossing to "generic" type. In that case for 00-SF on 33" radius the turnout radii are:
C-10 = 664mm (26"),  D-12 = 709mm (28"),  E-16 = 760mm (30").

To summarize that: RTR models with RTR couplings: minimum 20" radius. Scale models with scale couplings: minimum 30" radius. Individual models can of course be modified to negotiate sharper curves, and short-wheelbase shunting locomotives should do so anyway.

regards,

Martin.



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