The "stall" current, when defined as the motor completely held in a
none rotating condition and 12 volts applied to the model is about 3.5
amps for the Pittman. This is the motor that is installed in the UP
4-8-4, NYC Niagara and others.
The "stall" current runs in the 1.1-1.2 amps when; "stall" is
defined as, the model is on the track but can't pull anymore because
the wheels are slipping. This is on a flat, level, dry nickle-silver
rail surface.
The above are not real scientific results. BThey are kind of crude
but at least they are in the "ball park"
I do not recommend you perform the first, wheels locked up test,
unless you are prepared to replace the universals in the model tested.
On mine the motor shaft applied enough torque to rip out the bore of
the universal piece that is attached to the motor making that part of
the universal totally useless. This all occurred at the 3.5 amp point.
If you have to prove the "Locked Stall" to yourself I recommend
taking the motor out of the model, lock the small end sticking out the
rear in a vise and hang on to the motor body. I think you will be glad
you did it that way. I'm not really sure but I think the Pittman
factory rating is something like 6 amps at 18 volts. Anyway.
I now need to disassemble and rebuild my Niagara. When I place it
on the track I can hear the motor run but the model won't move.......
This all proves you don't need to try this kind of thing because there
is at least one dummy on the left Coast. A guy that just can't seem to
keep his fingers out of anything.
Rusty (Rustermier)
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