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The last "whoop" for GE?

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The last "whoop" for GE?
Posted by BNSF UP and others modeler on Thursday, August 09, 2018 10:33 AM

As stated in another thread, I just got my Tier 4 gevo from scaletrains, an ET44C4 to be exact. After listening to it and running it for a bit, I haven't heard any GE "whoop", and I wanted that sound. Is it because GE's newest loco's no longer have it? Or should I listen more patiently?

BNSF: Big and Noisy but Surely Fascinating!

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Posted by gmpullman on Thursday, August 09, 2018 11:15 AM

F20 should toggle the compressor. In the ESU demo here at about 00:50 seconds I hear the compressor kick on but no "whoop" as I'm familiar with on the GE "Genesis" locomotives.

http://projects.esu.eu/projectoverviews/search?type=diesel&q=tier%204

 

I don't exactly know, other than a Westinghouse 3CDC compressor, what the ET44C4 type compressor is. They all seem to be motor driven rather than off the prime mover drive shaft as in the past. I'm also not sure which compressor types are available on the particular LokSound decoder that ScaleTrains uses. Presumably they would already have the proper type selected in a factory installed sound project.

Good Luck, Ed

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Posted by BNSF UP and others modeler on Thursday, August 09, 2018 11:21 AM

Yeah, I figured out the F20 compressor thing, but all I have heard is that sound that sounds like a cross between a baby rattle and some sort of musical instrument...

Thats why I'm confused.

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Posted by gmpullman on Thursday, August 09, 2018 11:46 AM

I'm not in front of my Loksound file info at the moment. It seems to me that the compressor type is part of the prime-mover sound file and is not selectable. For instance, the Dash-7 file specifically mentions the "whoop" compressor:

In the Mid 1980s GE changed it's 16cyl FDL design to include a different exhaust silencer, a new electric compressor often known as the "Whoop compressor" and changed some of the electronics of their locomotives. These differences among a few other led to a distinct change in the sounds from the GE 16cyl FDL often found from the U25Bs on through the Dash-7 series of the Locomotives. 

The Gevo file seems to have the shaft-driven compressor, as you have heard. 

Good Luck, Ed

 

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Posted by Metro Red Line on Tuesday, November 27, 2018 6:30 PM

This is distresing news. Hopefully a sound file update can be provided to rectify this, if indeed the ET44 has a "Whoop" compressor. 

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Posted by dknelson on Tuesday, November 27, 2018 8:38 PM

Until then, an "analog" solution is to have bean soup before operating sessions.

Dave Nelson

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Posted by cv_acr on Wednesday, November 28, 2018 5:36 PM

Metro Red Line

This is distresing news. Hopefully a sound file update can be provided to rectify this, if indeed the ET44 has a "Whoop" compressor. 

 

But the question that isn't answered here is do any real ET44s actually have the old "whoop" compressor? If they've switched over to a different compressor, then it's correct and there's nothing to rectify.

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Posted by Metro Red Line on Thursday, November 29, 2018 4:53 PM

cv_acr

But the question that isn't answered here is do any real ET44s actually have the old "whoop" compressor? If they've switched over to a different compressor, then it's correct and there's nothing to rectify.

 

 

Maybe we should post this question on the Trains magazine Locomotives subforum...

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Posted by BNSF UP and others modeler on Thursday, November 29, 2018 7:01 PM

Oh yes please do. I am still curious. Mebbe GE respones to emails from prototypically interested modelers too?

BNSF: Big and Noisy but Surely Fascinating!

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Posted by maxman on Friday, November 30, 2018 2:36 PM

What is the difference between an ES44 and a ET44?

 

The ES44Ac has the "whoop": https://www.youtube.com/watch?v=8PZ8fH_sBqg

 

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Posted by maxman on Friday, November 30, 2018 2:44 PM

I believe that the Scale Trains loco comes with a Loksound V4 decoder, not the select decoder.  If this is the case, you should be able to change the compressor sound to whatever you want it to be, assuming that ESU has the "whoop" sound file somewhere.

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Posted by BNSF UP and others modeler on Monday, December 03, 2018 4:47 PM

But more of what I want to know is if the prototype ET44C4 had the whoop. Otherwise there is no point in changing the cv.

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Posted by Metro Red Line on Monday, December 03, 2018 11:17 PM

I posed the question on the Trains magazine Locomotives sub-forum. 

No solid, definitive answers yet, but someone made a comment on Australian GE locomotives that sort of leads us to believe the compressor was changed:

Here's a link to the thread:

http://cs.trains.com/trn/f/741/t/273239.aspx

 

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Posted by BNSF UP and others modeler on Tuesday, December 04, 2018 2:25 PM

Thanks! Hopefully we get a definite response. Otherwise its back to teir 3 models to capture the classic whoop.

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Posted by maxman on Tuesday, December 04, 2018 4:39 PM

BNSF UP and others modeler

But more of what I want to know is if the prototype ET44C4 had the whoop. Otherwise there is no point in changing the cv.

Once again, what is the difference between a ET44C4 and an ES 44?

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Posted by M636C on Tuesday, December 04, 2018 5:23 PM

maxman

 

 
BNSF UP and others modeler

But more of what I want to know is if the prototype ET44C4 had the whoop. Otherwise there is no point in changing the cv.

 

 

Once again, what is the difference between a ET44C4 and an ES 44?

 

An ET44C4 has four AC motors, an ES 44 can have six AC motors or six DC motors unless it is an ES44C4 which has four AC motors.

The ET44 looks much more like an ES 44 than it is...

The engine is entirely new with few interchangeable parts and has two turbochargers instead of one. The cooling system is much larger.

But the point I made at the link above is that GE changed the control equipment that operates the electrical air compressor, so the compressor does not make the sound any more.

In Australia we had 120 model Cv40-9i units which all made the "whoop" sound.

Later GE locomotives did not, and the Cv40-9i units were all rebuilt with updated electronics, but kept the old compressor. But the whoop sound went away.

So if ET44s have the same compressor control equipment as the rebuilt Cv40-9i, they would not make the sound.

The quick answer is to go out and listen to an ET44. There are hundreds of them.

Peter

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Posted by BNSF UP and others modeler on Saturday, December 15, 2018 12:16 PM

Sorry that I didn't respond to your question the second time, maxman. I haven't been able to log on for over a week. I just managed to get back in today.

BNSF: Big and Noisy but Surely Fascinating!

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