Stupid question
- Sir Clothem Cap
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Stupid question
I have heard is said that if you don't ask stupid questions you never learn anything so here is mine.
Having just avidly read the new 16mm Handbook I find that reverse curves are to be avoided. What is a reverse curve
Having just avidly read the new 16mm Handbook I find that reverse curves are to be avoided. What is a reverse curve
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- IrishPeter
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Re: Stupid question
LOLROFLAO!!!Sir Clothem Cap:61843 wrote:Having just avidly read the new 16mm Handbook I find that reverse curves are to be avoided.
That's another rule I have broken, then! Actually when I cannot avoid a reverse curve I always put a short stretch - at least a foot - of straight track between the two componants of the curve. I think what you are actually meant to avoid is going straight from a right-hander into a left-hander (or left to right) as it causes problems with buffer interlock and stuff like that.
Peter in AZ
Traffic Pattern? What pattern? Spuds out; grain in, but cattle, sheep and passengers are a lot less predictable.
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The association of 16mm narrow guage modellers
www.16mm.org.uk
issue a quarterly magazine called 16mm today and once a year you get a handbook as well. Good value IMHO.
www.16mm.org.uk
issue a quarterly magazine called 16mm today and once a year you get a handbook as well. Good value IMHO.
Not quite, you get the handbook when you join. This year though as a new one was made a copy was sent to exisitng members. In the past there has been wagon kits, brass etchings and one year a book.
Dan,
James: "Dan, can you use your hearing and tell me if that trains coming ?"
DLR
www.freewebs.com/dlrail
James: "Dan, can you use your hearing and tell me if that trains coming ?"
DLR
www.freewebs.com/dlrail
- Sir Clothem Cap
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- IrishPeter
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I am thinking that they are problematic when using tight radii. My curves tend to be 10' radius, so with a short straight section between I do not have problems with my reverse curves. However, imagine doing that with R1 or R2, and I think you can see why they tell you to avoid reverse curves.
Peter in AZ
Peter in AZ
Traffic Pattern? What pattern? Spuds out; grain in, but cattle, sheep and passengers are a lot less predictable.
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I think the problem arises because most model rail track curves are
to a constant radius and when you go from say 3' rad one way abruptly to 3' rad the other you will get a pretty savage swing and maybe buffer lock and all that malarkey.
On a full size railway ( and some models) the curves are transitional
( mathematically known as a clothoid- or euler spiral).
This is where the curve starts imperceptably from straight and the curve gets tighter before flattening out into a straight line again.
If you've got the space its not difficult to plot a transitional curve but probably easier on an indoor layout on a baseboard.
to a constant radius and when you go from say 3' rad one way abruptly to 3' rad the other you will get a pretty savage swing and maybe buffer lock and all that malarkey.
On a full size railway ( and some models) the curves are transitional
( mathematically known as a clothoid- or euler spiral).
This is where the curve starts imperceptably from straight and the curve gets tighter before flattening out into a straight line again.
If you've got the space its not difficult to plot a transitional curve but probably easier on an indoor layout on a baseboard.
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