Model Railroading > Is my math right?

I have a certain caboose I want to scratchbuild.  Model Railroader published scale drawings in 1993 or '94, which were in S scale.  I'm working in HO.

Now, we know that S scale is 1:64 and HO is 1:87.  Since 64/87 = 0.74, I would have to set the copy machine at work to 74% in order to re-size S-scale drawing down to HO, right?

Yes, that is correct. But the ratio for HO is actually 87.1, but it doesn't make much of a difference in your calculation.

Victor A. Baird
http://www.erstwhilepublications.com



Edited 2 time(s). Last edit at 02/12/16 10:43 by wabash2800.

Take a scale rule with you to confirm that the copy you make is true scale. You might have to adjust up or down deoending on the copy machine.

wabash2800 Wrote:
-------------------------------------------------------
> Yes, that is correct. But the ratio for HO is
> actually 87.1, but it doesn't make much of a
> difference in your calculation.
>
> Victor A. Baird
> http://www.erstwhilepublications.com

Wow, after a kazillion years in the hobby, I did not know this! Kudos, Victor!

Now, at 87.1 to the foot, how far oversize are my .020 diesel handrails, again? (-:

EO
Every day is a learning experience...
 

There is about 13/16 of an inch of difference for an HO mile using 87 versus  87.1.  <G>


Victor A. Baird
http://www.erstwhilepublications.com



Edited 2 time(s). Last edit at 02/28/16 23:18 by wabash2800.

As Maxwell Smart used to say, "Missed it by That much."

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