Death-trombone of Marseilles – fact or fiction?

[MaxHeadroom]

Thank you, Hobbes and NARSES2.

Now, busy by connecting all the parts, I'd realized, I'd forgotten two connections: the mouthes for the trailers' towbars - one at the StuG, the other at the power-plant-trailer.
O.k., the problem in 1:76 is...: you're right; the problem is 1:76!
Using other words: making the mouthes tiny enough to make them as realistic as possible, on the other hand making them big enough to be workable.
I got it!
But now the "eyes" of the towbars were much too big to fit into the clutch (is "clutch" a correct word [in german, we say "Kupplung" = clutch]?).
Now, I'd maked new eyes.
Pics will follow.

Norbert

[Hobbes]

It's a coupling. A clutch sits between the engine and gearbox of a car.

[MaxHeadroom]

Thank you for the help, Hobbes.


Now the pics.

The winding train:


Now the connections fits:


Thank of the new "eyes":


The couplings with their fixing bolts:

I think, to have cut off the coupling from the trailer's backside and glue it a bit higher again.
Sorry for seeing it so late.

Norbert

[zenrat]

Looking good.  I can only begin to imagine what it sounds like...

[MaxHeadroom]

Au contraire..., dear zenrat!
You won't hear anything, I suppose.
Because it must have been worked with infrasound, that means ultra long frequencies far below 20 Hz!
(Calls of elephants can have between 15 and 35 Hz with a range of roundabout 10 kilometers [6 mls].)
Maybe you have could have SEEN the "trombone" working, because the air in front of the funnel must waving a bit like the ocean's swell at the beach, maybe like the air's shimmer when you see a Fata Morgana.

BUT! Don't step in front of the funnel while it's working! It could have been your last step!


Norbert

[NARSES2]

This really is looking good 

[MaxHeadroom]

Two more little things (but nevertheless quite important).
Two ladders.

To climb on the generator's platform, the crew needs a ladder.
And to climb to the solenoid, to plug in or to plug off the power-cables, the operator needs a ladder, too.

First both ladders at one view:

The left one is fixed and stabilized with two bars below the platform.
To build the right one, I was forced to make it movable, because I only have one trailer for the two funnel conditions.
On the pic above, you see the transport status.

2nd; trombone-trailer-ladder freezed in motion:


3rd; same ladder in ready-for-use mode:

If someone likes to know, how I have made it movable and what kind of hinge, I have puzzled, just ask and I will do a sketch and show it.

Norbert

[zenrat]

Au contraire..., dear zenrat!
You won't hear anything, I suppose.
Because it must have been worked with infrasound, that means ultra long frequencies far below 20 Hz!
(Calls of elephants can have between 15 and 35 Hz with a range of roundabout 10 kilometers [6 mls].)
Maybe you have could have SEEN the "trombone" working, because the air in front of the funnel must waving a bit like the ocean's swell at the beach, maybe like the air's shimmer when you see a Fata Morgana.

BUT! Don't step in front of the funnel while it's working! It could have been your last step!


Norbert

Good points.
But what if Helmut (the tank driver) borrows it for his teenage son's birthday and they hook up the gramophone to it to play his collection of banned jazz recordings?

[Mossie]

You might not hear the trombone itself, but you'd feel it.  Human's can perceive infrasound, (if not hear it) and it can be quite unpleasant (even without the intensity of the trombone). You might feel sick or even hallucinate (it's been potentially linked to ghost sightings), or just generally feel uneasy.

You may hear secondary effects, such as buildings vibrating, resonance inside vehicles etc.

[PR19_Kit]

I hope it has a notch filter at around 7 Hz, or it will spoil the crew's whole day as well as any enemies!

[MaxHeadroom]

A technical-/physics-discussion... I like it.
Seems the sound-cannon-theme is interesting.

May be, zenrat,  Helmut and his crew might use the speaker for private or semi-private use. Maybe for family, maybe for a comradeship-party...
To play "Neger Musik" or anything other he only need to modulate the frequencies.
And thank you, you are a genious! I must confess, I have forgotten to place a tuner/modulator on the solenoid platform!! Thanks a lot, pal!

Mossie; yes, the phenomenon of feeling sounds you can hear, when deaf people are telling about.
Hearing people can feel it also, but less intensively, I think.
I remember, standing close to speaker-towers at a rock-concert, you can hear and feel it as well and it is a complete-body-experience.
There is a song of Herbert Grönemeyer (one of the actors in the WW-II-UBoat-movie "Das Boot") about a deaf girl, loving hard-rock-music "Sie hört Musik nur, wenn sie laut ist" (She only can hear music, when playing loud).

PR19_Kit; I imagine, the crew wears some special protection-suits..., something like a G-suit of jet-pilots, or anything like this. You know, what I mean?

Norbert

[Hobbes]

When a note is too low to hear, you can usually feel it in your chest (or whole body if it's loud enough).
There's also a good chance you can hear some of the upper harmonics.

And there's this:


That's a car audio system producing ~150 dB around 50 Hz.

(from https://www.youtube.com/watch?v=KN8DKhTDh8Q)

[PR19_Kit]

A G-Suit, or anything like it,  wouldn't work.

The 7 Hz business is something to do with the resonant frequency of various body cavities, or of organs within those cavities. A G-Suit wouldn't stop the frequencies, thus my suggestion of a notch filter which would remove its effect from the Trombone. While it may inhibit the effect on the enemy at least the crew would survive!

[Go4fun]

That moving ladder looks very interesting. I can think of an application I might have for it.

[pyro-manic]

If you've ever been to a really loud gig or festival (say, Motorhead for example) you can actually feel the music as well as hear it. You get a weird pressure in your throat (like you need to burp) caused by the bass frequencies. It's quite odd if you aren't expecting it, and rather unsettling.