Hello All,
I believe some Lima offerings in O gauge use differing
scales, such as the coaches being 1/48 whilst locos
are 1/43.
At shows, certain Lima outline offerings turn up, such
as a French diesel I saw at Telford.
Does anyone know what scale was used for these models?
Also, does anyone know what is the linear scale used
for the Bachman On30 narrow gauge model line?
Thanks in advance for any help
Pete.
"Peter Principle" wrote
I think it's all to one scale (1:48), but some UK liveried items are
actually continental prototypes and may appear to be overscale compared with
the coaches.
John.
=>Also, does anyone know what is the linear scale used
=>for the Bachman On30 narrow gauge model line?
1:48
Runs on 16.5mm track. Use Peco's On30 track if you want correct tie size and
spacing. Or fudge it with standard gauge OO/HO track.
I think the Lima were a hybrid scale, something like 1:45.
Those are 1/48, being intended for the US market.
It's a bit of a mix and match though, because the prototype was
3' gauge instead of 2'6". Although the little Porter was available for a
variety of inductrial gauges including 2'6". But eg the the Colorado stuff
was 3'.
That's dependent on what degree of compromise you're prepared to accept in
scaling your models.
I don't see any point in converting a metric prototype dimension to an
Imperial measurement and then dividing by an Imperial:Metric ratio to get a
metric model dimension which fractionally doesn't match the accepted and
official metric scale.
Once I know the scale dimensions I wish to model, I make the adjustments to
suit the materials and tools available and to suit my modelling skills.
I certainly wouldn't use the US rounded scaling factor, because that
introduces an error before I make my own modelling compromises.
Regards,
Greg.P.
So your models of 1m diameter wheels will measure 11.4942528736--- mm
or do you use something other than exact scale?
Perhaps an 11.5mm wheel, ie scale of 1:86.96, or even an 11mm wheel, a
scale of 1:90.96 (and I know they might be worn wheels, that's not
the point)
The difference between 1:87 and 1:87.1 is not significant in
modelling, even P87 track and wheels are compatible whichever scale
you use.
An 80ft car is 0.28mm different in length, can you model well enough
to tell?
Keith
Make friends in the hobby.
Visit
Garratt photos for the big steam lovers.
Hmmm, my wheels measure 11.5mm, 11.08mm and 10.5mm depending on the situation.
Yes there is a significant difference: - I start with a prototypical dimension -
I apply my scale factor - I _then_ adjust to suit any factors I decide are
appropriate.
You say the ".1" is not significant. That immediately brings forth two questions:
- why include it?
- when does a figure become significant?
-1:76(.2)?
-HO by MOROP standards is 1:87 with 1:80 as an alternative. I'm informed by some
modellers that the difference isn't significant!
That extra figure can affect rounding of a converted dimension when one works to
the nearest 0.5mm.
When I fit my wheels to, for example, a Roco wagon I have to take into account
that Roco have already fudged the design to suit 11mm wheels, Märklin to suit
10.5mm wheels. Correct diameter 11.5mm wheels won't fit without fudging other
dimensions.
A length over buffer beam and a length over buffers rounding can make a
difference that is visible in a model.
Regards,
Greg.P.
We sure do. rtr locos with a few details added, throw in a little
kitbashing of buildings, rolling stock and locos and that suits many of us
to a tee.
--
Cheers
Roger T.
So where do they get 1:43.5 and 23mm/m from then? Both of those are
7mm/ft rounded off as you so like to do but indistinguishable in
practice except to those who can see the effect of 0.28mm in a 280mm
long coach. 1:45 is the 'corrected' scale to correctly fit 32mm
gauge. So, IMHO, there are two european 'O' scales and several ways of
expressing them.
Keith
Make friends in the hobby.
Visit
Garratt photos for the big steam lovers.
They come from dividing the prototype gauge by the model gauge - why would
Europeans use English feet when converting a prototype metric measurement
to a model metric measurement?
I fell foul of this situation years ago in converting Württemberg
prototype drawings in "fuss" (feet) to scale size using 3.5mm as the
conversion factor. They are a quite different measurement!
Yes, there are at least two European continent 'O' scales and considerable
arguement as to which is "correct".
Regards,
Greg.P.
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