Here's a way to do quick and dirty estimates of your trains speed:
- Pick one of the times from the "seconds" column for your scale
- Measure (or estimate) how far your train goes, in inches, in that amount of time
- Divide that distance by the number at the bottom of the column.
The result is pretty close to the train's speed in MPH. The error for each of the combinations is shown. Once you find a combination that works for you (some of the times are pretty long), you just need to remember the time and the "divide by" number and you can do the math in you head (well, maybe).
- Pick one of the times from the "seconds" column for your scale
- Measure (or estimate) how far your train goes, in inches, in that amount of time
- Divide that distance by the number at the bottom of the column.
The result is pretty close to the train's speed in MPH. The error for each of the combinations is shown. Once you find a combination that works for you (some of the times are pretty long), you just need to remember the time and the "divide by" number and you can do the math in you head (well, maybe).