Build your own supercharged Siren

[Niklas]

Hi.

After a long time of absence I'm back and I'm somewhat proud to
present my new project: My own supercharged Siren.
Since I started a apprenticeship, I have the opportunity to use lots of
different tools and machines for metalworking. Thus I could not stand to
tell my boss about my plans of building a siren and surprisingly he
sparked interest in sirens. Finally we made a deal:
I had to obtain a siren for him and therefor I'm allowed use all
the things I need.


Ok, everything starded with disassembling a cheap "ebay's got lots of 'em"-siren and taking measurements.



Then I used the lathe to build a new stator out of brass, that fits on
a pipe I found in the scrap metal box:





Yes, this single port stator appears to be a bit Thunderblotish. And a Thunderboltish
siren needs a horn, so I built one out of steel from the scrap:



And here are the parts of the horn support:






Since I want to install my siren on my balcony, it needs a tripod:



Next week, I'm going to attach the pipe to the tripod and if things work
out I'll install the siren next weekend.

Regards,
Niklas

[CJ]

So where's the 'blower' or supercharger as some call it?

Very nice work, but unless you make/get a blower for it, it will be quieter than to start with.

[Niklas]

I'll use a blower from some earlier projects. It's basically a radial blower with
three stage producing a pressure of ~35 psi. The adapter for the blower and
the control unit are the last thing i've planned to to build.

[Nelso90]

Damn!
35PSI oughtta get it singing! I always thought you needed an exponential horn profile for a supercharged siren, but considering how loud a 2001 is without an exponential profile, you'll be fine! Those are some mighty nice welds on that horn too!

[CJ]

35PSI?

Damn, that's gonna bring the pitch down of that little siren a lot. I know that thing screams but it shouldn't sound too far off of a 1000 now!

How many cfm or litres/hr does the radial blower put out?

Anyway, that thing is gonna be loud, with a blower like that on it.

Mike! the new 2001s have an exponential horn, hehe.

[JasonC]

Damn!
35PSI oughtta get it singing! I always thought you needed an exponential horn profile for a supercharged siren, but considering how loud a 2001 is without an exponential profile, you'll be fine! Those are some mighty nice welds on that horn too!

Actually, the inner portion of the inside of a 2001 forms an exponential horn (similar principal on the Modulator).

[Jim Z]

Interesting project, Niklas.

Nelso90:
but considering how loud a 2001 is without an exponential profile, you'll be fine!

as Jason says, the 2001 does have an exponential horn. Here's a section view from the 2001-130 manual:

[CDV777-1]

I'll use a blower from some earlier projects. It's basically a radial blower with three stage producing a pressure of ~35 psi. The adapter for the blower and the control unit are the last thing i've planned to to build.

35psi is one thing. What you need to make a siren loud is a large VOLUME of air. It can be 35psi but if it's not a lot of air I don't think it will be that loud at all.

[Charlie Davidson]

A bit off subject..but two of your pictures were replaced by some kind of "image-letter"..

[TSMaster5150]

It appears that Imageshack has been hacked by some sort of group that wants to show how vulnerable websites servers are?

EDIT: http://mashable.com/2009/07/10/imageshack-hacked/