Coded Sterling Siren

[Rheems1]

I know that we have all talked about the fact that the Fedalcode sirens are equipment with a damper to code out boxes. Well, here is a coded Sterling siren... as you can see it has louvered shutters on both intakes that open and close to send out the code. It is no longer used in coded form... but I wanted to share a picture of this coded Sterling with everyone. It is from the West Pittston Fire Department in Luzerne County, Pa.

[Justin]

Nice!

Thanks for sharin'.

[JasonC]

I believe some sterlings were fitted with a brake instead of louvered shutters. Great find!

[SirenMadness]

Great find, Dave!

I think that I can see a braking mechanism behind the right rotor.

[cjf1616]

Heres one of my pictures from the Siren Archive,
A coded Sterling (at least I think its a Sterling) which uses brakes.

[CinWx]

I located the patent document on the Sterling M coded siren.

http://www.google.com/patents?id=ith5AA ... ling+siren

I'd recommend downloading the PDF so the images can be rotated. It pretty much explains how the braking mechanism works.

The first Sterling in this post is quite interesting in design (the squared-off appearance). I think I've only seen a few others like that one (in the Siren Archive). The last picture posted by cjf1616 is the same siren without the sheet metal covering.

[Robert Gift]

HOW DOES BRAKING WORK??

What opens and closes the louvers in the top photo?

Thank you for the interesting photos.

[500AT]

Fantastic discovery! Thank you for sharing this with the rest of us.

[Archon]

Sterling with the motor brake were called a Y-5 and I have one in my garage

[Robert Gift]

Seems that the 2t22 is a much better design.
Instead of horizontal orientation, as above, with rain/snow deflecting hoods causing who knows what kind of cancellation and sound directionality problems,
a 2t22's stators are unobstructed and it's projectors efficiently aim sound 360 degrees horizontally.

But one alteration I'd like to do to the 2t22 is make the top and bottom intake cones into exponential horns curved 90 degrees aimed in specific directions.
This is based upon my discovery from my little flashlight siren that much sound emits from the rotor intake!