RailPro > RailPro Specific Help & Discussion
How Many Notches (vs notching sound)
William Brillinger:
Here's what I anticipate seeing in the video:
We know the Throttle is controlling the electrical connections for the traction motors, not the rev's of the Prime Mover.
The throttle moves side to side to advance the notches.
The throttle moves up and down to engage or disengage the electrical circuit.
So I expect to see 1, 2, 3, 4, 5, 6, 7, 8 left to right positions for the throttle and DOWN is "OFF" electrically, which is "IDLE" for the Prime Mover.
So going from OFF to 1 does not change the governed rpms of the prime mover but will bog the prime mover down as it is loaded until it returns to the proper RPM. Which lines up with what Tim suggested about notch 1 being "lower" than Idle.
Here is a great thread on MRH that is very related to this discussion:
http://model-railroad-hobbyist.com/node/24130
G8B4Life:
I think you might be right there Bill, bogged down not lower RPM, though the document I read did say lower.
I did find a video that demonstrates this bogging down with one of those 6-567 prime movers. It's noticeable at about 1:17 and quite noticeable at about 2:40, both when starting off.
Maybe this bogging down is not distinguishable enough for most loco's to be included in sound files so they make idle and notch 1 the same.
As for the up and down movement of the throttle well I can't say I've ever seen that. Different control stands perhaps?
- Tim
William Brillinger:
Well my memory from my teenage years riding along on GP38-2's and 40-2's is all wrong. My memory told me there was an up/dn lock & ratchet kind of system on the throttle.
so.... Here's the video. This is a GP38-2.
Video courtesy of Tom G.
There is an idle position plus 8 "notches" and you'll notice that idle and 1 are identical. If the reverser was not in neutral, the prime mover would have bogged down a bit in notch 1.
Cheers!
KPack:
Nice video Bill. Thanks to Tom for providing that. So it looks like we were on the right track then....8 notches and notch 1 = idle.
As a side note, I would love to get a good recording of that GP38-2. A really good 645 roots recording would be welcome indeed.
-Kevin
melarson:
Thanks to all who contributed to this thread. I now have a better understanding how the prototype operates and can use that knowledge to more accurately operate my models. And I can dismiss the thought that the sound files need to be changed, because they don't. Many thanks again.
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