[Doug]

This is an extract of the Hornby Class 08 DCC installation that we did. We debated the top speed (based on a maximum prototype speed of 27.5mph) and after some experimentation we agreed that 100 seemed realistic enough at the top speed for the loco. The mid point was set to 50 giving the speed curve a straight line shape.

DCC CV Settings for the Class 08/09 Locomotive CV1 12 Address (The loco number) CV2 1 Minimum Speed (V Min at step 1) CV3 4 Acceleration delay (0-15) CV4 4 Brake Delay (0-15) CV5 100 Max speed (V High) CV6 50 Acceleration Curve (V Mid) CV9 216 PWM frequency (69Hz) CV29 3 Decoder Configuration CV49 0 Decoder specific values CV50 20 Decoder regulation The rest of the CV's are left untouched (factory default).

 

[Doug]

Yes, I suppose it does depend on the decoder. Originally there was an Arnold 81201 decoder in there - that had those funny limits.

I now have a Hornby R8215 decoder and it works just as well with no max speed setting and no Vmid either.

Without worrying too much on specific settings of any particular decoder, the aim is to keep the top speed down and to make the starts and stops slow and gradual. You don't want it to lurch off at any speed setting. Play around with acceleration delay and braking delay.