Author Topic: JNJ Snow Shield dimensions  (Read 1143 times)

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up1950s

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JNJ Snow Shield dimensions
« on: January 02, 2013, 12:19:28 AM »
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I found my stash of 8 , but I want more . I am posting this in hopes of somebody picking up where JNJ left off .









« Last Edit: January 02, 2013, 11:03:29 AM by up1950s »

Bendtracker1

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Re: JNJ Snow Shield dimensions
« Reply #1 on: January 02, 2013, 12:36:43 AM »
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Thanks Richie!

Sokramiketes

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Re: JNJ Snow Shield dimensions
« Reply #2 on: January 02, 2013, 08:35:36 AM »
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Do you like these?  I picked up a set, folded them up, and decided the bends were too square.  I left them off the model and am waiting for a better solution.
Mike

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C855B

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Re: JNJ Snow Shield dimensions
« Reply #3 on: January 02, 2013, 09:51:15 AM »
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I'm with Mike. Also, by the time you're done folding everything it's too thick - like a scale 3". It's designed for ease of assembly rather than 100% accuracy. That's OK, I guess, but anybody messing with that level of detail is probably biased toward accuracy, anyway, what's another 10 minutes of futzing with it?

What I did a gazillion years back (actually?... 40 years ago!) was form my own out of .010 brass and used #30 copper wire for the ribs. I soldered a couple of loops of brass underneath then ACC'ed it to the winterization hatch. Having no reference at the time I eyeballed the dimensions. Of course this was on an Atlas (RR) E-8, so it was relegated to shelf queen status in a matter of a few hours of running.
...mike

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up1950s

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Re: JNJ Snow Shield dimensions
« Reply #4 on: January 02, 2013, 11:01:14 AM »
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Do you like these?  I picked up a set, folded them up, and decided the bends were too square.  I left them off the model and am waiting for a better solution.

That's why I haven't put them on yet , but as I get older and no better examples come forth I may wind up using this less than ideal design .

up1950s

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Re: JNJ Snow Shield dimensions
« Reply #5 on: January 02, 2013, 11:11:54 AM »
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How are the new E's look and are made from PMS ? :facepalm:

nwline

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Re: JNJ Snow Shield dimensions
« Reply #6 on: January 02, 2013, 09:06:21 PM »
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PM sent

up1950s

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Re: JNJ Snow Shield dimensions
« Reply #7 on: January 02, 2013, 11:33:36 PM »
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Chris333

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Re: JNJ Snow Shield dimensions
« Reply #8 on: January 03, 2013, 03:29:40 AM »
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What the heck are these in real life?

up1950s

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Re: JNJ Snow Shield dimensions
« Reply #9 on: January 03, 2013, 04:51:13 AM »
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What the heck are these in real life?

To keep the snow out .

Chris333

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Re: JNJ Snow Shield dimensions
« Reply #10 on: January 03, 2013, 04:57:56 AM »
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Ah OK here I was thinking like smoke shield on a 4-8-4.  :|

up1950s

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Re: JNJ Snow Shield dimensions
« Reply #11 on: January 03, 2013, 05:04:41 AM »
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Ah OK here I was thinking like smoke shield on a 4-8-4.  :|

Here is a decent top shot .
http://www.flickr.com/photos/47911905@N00/7583008710

Sokramiketes

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Re: JNJ Snow Shield dimensions
« Reply #12 on: January 03, 2013, 08:28:28 AM »
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To keep the snow out .


I always thought it was odd that they "kept the snow out" but weren't over the opening in the winterization hatches.
« Last Edit: January 03, 2013, 10:04:38 AM by Sokramiketes »
Mike

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C855B

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Re: JNJ Snow Shield dimensions
« Reply #13 on: January 03, 2013, 10:02:09 AM »
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I can answer that! Yes, there is actually a big hole cut in the winterization hatches underneath the wings, and yes, it is to keep the snow out.

The fan that lives under that spot is actually an intake fan for carbody pressurization and combustion air, not a radiator fan. The stock EMD "winterization hatch" has a lever on it which controls damper vanes which are closed in cold weather to reroute radiator heat exhausted by the adjacent fan back into the carbody.

This intake is filtered. UP was having problems with snow clogging the filter if the damper was left open on their long-haul trains that encountered mixed weather. Their conclusion was to forget the damper and cut an opening in the "blank" part of the hatch, but cover it while allowing intake flow.

I sort of backed into knowledge about this over the years, but confirmed it in direct conversation with Steve Lee (director of the UP Heritage program at the time). Also explained at length at Don Strack's Utah Rails.
...mike

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We don't make mistakes, we have happy accidents. We just don't tell anybody. -Bob Ross

peteski

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Re: JNJ Snow Shield dimensions
« Reply #14 on: January 03, 2013, 04:13:16 PM »
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...if the hatch etchings were made from 0.005" brass then the hatch would only be 1.6 scale inches thick at the thickest cross-section (and the visible edges would only be 0.8" thick.)
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