RR_Mel Well guys with the passing of Motorman and feeling a bit down as I looked through the box of motors Eldon sent me to play with over the years and decided to actually try one out in a Rivarossi Cab Forward. I’ve used the freebee motors in animation and one in my snow blower to turn the fan but not as locomotive power, all kinds of sizes and manufacturers. This particular motor is a 12 volt Philips 9904 series round can motor, I can’t distinguish the rest of the numbers on the label and all of the Philips can motors say 9904. This one measures 18.9mm diameter x 37.36mm long with a 1.5mm diameter shaft. At 12 volts no load it measures 8600 RPM. I installed an 8 tooth gear on the motor shaft and a 16 tooth gear on the Rivarossi drive line and here is what I ended up with. No Load: 8.2 volts at 62ma = 320 wheel RPM or 60MPH scale, Approximately 68.5% throttle using a MRC2500 power pack. Locomotive and Tender only: 8.2 volts at 69ma = 298 wheel RPM or 56MPH Towing 10 cars on level track: 8.2 volts at 91ma = 256 wheel RPM or 48MPH EDIT: 12 volts at 101ma = 436 wheel RPM or 87.7MPH Is this in line with factory locomotives meaning 70% throttle towing 10 cars on level track at about 60 MPH? Before I try it on a DCC decoder I need to know if I can tweak a decoder to be fairly accurate using the set up above. Mel My Model Railroad http://melvineperry.blogspot.com/ Bakersfield, California I'm beginning to realize that aging is not for wimps.
Hi, I was just skimming through the unread topics and found this post. I guess it got lost in the shuffle. Would I be correct in assuming that your question about it being "in line with factory locomotives" is in reference to the performance of the prototype? If so, it sounds fairly close to what I've read about the SP AC-12's performance. I don't know how the DCC decoder would work with that setup though, I only run regular DC. Maybe someone else will have some tips. Did you have to make any changes to the power pickups or wiring? Also, where did you get the gears for the shafts? I have a Rivarossi Big Boy I'm thinking about remotoring, and I might consider borrowing this idea if I can find the right parts anywhere.