I've been pondering required CV settings to tune my locos for correct scale top speeds on the layout for past few evenings. I knocked this up in excel. I have a 3m measured distance on the layout, but this could be altered for any distance, or a complete lap of a layout to get more accurate timings, but it does give a good approximate speed in MPH. If I get time some evening I might knock it up into an iPhone app.
The net result was MM 141/181s were too fast on DC (i.e. 90mph) but pretty spot on at scale top speeds of 70-75mph on DCC with CV5 set to max of 255 on a variety of decoders (e.g. Lenz, LokSound, Bachmann, Zimo).
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Noel
Just posting this for fun.
I've been pondering required CV settings to tune my locos for correct scale top speeds on the layout for past few evenings. I knocked this up in excel. I have a 3m measured distance on the layout, but this could be altered for any distance, or a complete lap of a layout to get more accurate timings, but it does give a good approximate speed in MPH. If I get time some evening I might knock it up into an iPhone app.
The net result was MM 141/181s were too fast on DC (i.e. 90mph) but pretty spot on at scale top speeds of 70-75mph on DCC with CV5 set to max of 255 on a variety of decoders (e.g. Lenz, LokSound, Bachmann, Zimo).
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