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Reply to "MTH Engine Gear Ratios"

Ted,

I appreciate all of your comments. Makes me think further.

I ran a bunch of comparisons today between my equations and the remote. I am using the scale factor as a 16 bit number. My equations are:

DTO = ((RawValue) / ((ScaleFactor) * (11)))

DOD = (((46.5) * (RawValue)) / (ScaleFactor))

To come up with these equations, I first guessed that the raw value had to be divided by the scale factor. Then there needed to be a constant to get the correct value. I used a comparison with the value generated by the remote, worked backwards and found the constants needed. It amazes me how well these constants work in the equations as shown in the comparisons below. I can't explain the significance of these constants.

I'm still looking at the scale factor and how it could be derived from the gear ratio and driving wheel diameter

DOD
11 Sep 2019

Engine RTC Remote
1 646.41 646.4 U28B
4 297.30 297.3 SW1200
4 298.16 298.2
5 162.29 162.3 2-8-0 H9
5 163.41 163.4
6 159.58 159.6 Berkshire
11 290.29 290.3 0-6-0
11 290.55 290.6
13 100.52 100.5 GP7
14 38.73 38.7 GP38-2
14 40.92 40.9

DTO
11 Sep 2019

Engine RTC Remote
1 0.25967 0.3 U28B
4 0.88183 0.9 SW1200
4 1.73594 1.7
5 1.11786 1.1 2-8-0 H9
6 0.40387 0.4 Berkshire
6 1.09274 1.1
11 0.25700 0.3 0-6-0
11 0.51748 0.5
13 1.55870 1.6 GP7
13 2.08773 2.1
14 2.19460 2.2 GP38-2

Last edited by SanDiegoMark
OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

www.ogaugerr.com
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