Scale miles per hour - is this formula right?

Model Railroader General Discussion (Model Railroader)
21

(50 ft / 2 sec) * (3600 sec / hour) * (mile / 5280 ft) = 17 mph

        1 mph     17.6 in/sec      0.2 scale in/sec
        5 mph     88.0 in/sec      1.0 scale in/sec
       10 mph    176.0 in/sec      2.0 scale in/sec
       15 mph    264.0 in/sec      3.0 scale in/sec
       20 mph    352.0 in/sec      4.0 scale in/sec
       25 mph    440.0 in/sec      5.1 scale in/sec
       30 mph    528.0 in/sec      6.1 scale in/sec
       35 mph    616.0 in/sec      7.1 scale in/sec
       40 mph    704.0 in/sec      8.1 scale in/sec
       45 mph    792.0 in/sec      9.1 scale in/sec
       50 mph    880.0 in/sec     10.1 scale in/sec
       55 mph    968.0 in/sec     11.1 scale in/sec
       60 mph   1056.0 in/sec     12.1 scale in/sec
22

I had two well marked points 60" apart on the old layout. I used these to calculate scale speed with a target of 30 MPH for normal operation.

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I was amazed at how slow that was! I ran trains way too fast for too long.

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-Kevin

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23

I have got to admit that carrying the answer out past 2 decimals is a bit off the wall.