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Reply to "Williams 4000 Hudson (cab 5405) Does this have a smoke unit?"

Ted one question are you planning to run this motor with TMCC, DCS, DCC ? If so forget it. Does the seller give the static resistance I would be willing to bet it is not much higher than the original which is .8 ohms  There are several problems with using high current motors.  All those amps they pull eat up pick-up rollers and track.  All those amps create arcs and affect DCS and TMCC signals. You may get away with that current draw using an original mechanical e-unit or the Williams electronic e-units which use relays, not the ones with triac outputs. However no motor driver board is going to stand up to the load it will create. Well perhaps a TAS board with the 15A triacs, long out of production.  That Johnson motor with vent holes is going to squeal like a pig on a pitch fork at 14k.  I keep looking for alternative solutions to the 42:1 problem. An intermediate gearbox may be a solution we have not considered.  I have boxes of small gears and the idea of making an intermediate gearbox with somewhere between a 1.5 and 2 step up keeps gnawing on me. A 1:2 step up would bring that 42:1 ratio down to 21:1 since even in an oil bath box there will be losses due to friction so perhaps 25:1 should be the target which would be a 1.68 : 1 intermediate box.  A 12 tooth turned by a 20 tooth gear will be 1:1.66  close enough. Though I have all the parts you can buy brass gears shim brass and bronze or ball bearings on eBay cheap enough that such a intermediate gearbox should cost less than $20.   By the way, my measurements for wheel diameter and gear ratios are based on my N&W J not the Williams Hudson with approximately  .1" larger diameter wheels.  The proto J only has 70" drivers while the Williams drivers are a scale 73".  The motors and gear ratios which work well with the J would also work well with the Williams NYC Hudson. The Hudson will just be about 7% faster.          j

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