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Could Horn Sound Pressure Damage Headlight ?
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 Posted: Wed Oct 2nd, 2019 01:41 am
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Kitbash0n30
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Location: Boonville, Missouri USA
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Hey Y'all; a question relevant to one of my G scale HLW Mack bashes:L:

Could sound pressure from locomotive air horns damage a locomotive headlight, if the two are too close together?
Any of y'all have thoughts? Ideas? Theories? Speculations? Relevant real-world experiences?

Would it make a difference whether the real-world prototype headlight involved was incandescent or LED?
Would it make a difference whether the real-world prototype horn involved was single-chime or multiple chime?

Just sawed off the cab wall headlight moldings.
What I want to do is put the horn in the center, with a single beam headlight each side.
Since this railroad's time setting is anachronistic modern,
the headlights on the "real deal" would probably by now be LED.

Idea is to place single-chime horn in center where molded on headlight used to be,
then, one to each side of the horn, a headlight fashioned around a 5mm LED.
Arrangement would be:
(headlight) - horn - (headlight)

Photo is from back in April; only a wee bit more progress has been made since then.







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See y'all later, Forrest.
Screw the rivets, I'm building for atmosphere
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 Posted: Fri Oct 4th, 2019 10:16 am
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oztrainz
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Hi Forrest,
My best guess for your locomotive in the photo is - EXTREMELY UNLIKELY

For incandescent lights the relatively fragile filament is in a vacuum inside the globe,
and sound doesn't travel real well across a vacuum.
And modern LED's have nothing to shake loose when "blatted" by a loco horn.
So go for it.

These days real-world locomotive horns have specifications that give both the minimum and maximum sound output.
So "knock the walls of Jericho" down at 5 miles" sound-blaster type horns are a thing of the past or of the imagination.
Especially from a single horn trumpet as planned locomotive.

If you want to a look at the specification current US loco horns, have a look at
https://www.law.cornell.edu/cfr/text/49/229.129
This is probably way more than you want to know,
but it's the stuff rolling stock engineers have to design for on new/rebuilt locomotives in the US.

And for some single horn trumpets have a look at the FIAMM site for marine products at
https://www.fiammcomponents.com/en/australia/avvisatori-acustici/applicazioni/nautica.aspx
Click on a horn, then the Audio/Video tab to get at the sound file.




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John Garaty
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 Posted: Fri Oct 4th, 2019 02:10 pm
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Kitbash0n30
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Ahh, thanks!

Off now to look those up.





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See y'all later, Forrest.
Screw the rivets, I'm building for atmosphere
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