Could butterfly valves/dampers fit within a Hurricane chopper assembly? That seems technically difficult to me. The Hurricane wouldn't necessarily have solenoid "ears" like the Thunderbolt 1003 either since the choppers are spaced so far apart. There could've been solenoid valves on one si...

I think it takes a lot of luck looking at sites like Iron Planet, GSA, whatever popular municipal auction sites are around, which there are plenty because everyone has their own preferences.

Can anyone explain to me what part of the siren this is and where the solenoid is in that picture. ( I might be totally wrong about where it is because the quality isn't good.) I am making/3D printing a 1/2 scale of a Hurricane 130. It looks like a Mk. 1 Hurricane or whatever the square-horned vers...

I would also be wary about trying to make a 3D-printed Model 2 run at full RPM with a chopper of that size out of 3D-printed materials. Model 2s run at over 6000 RPM and that puts a lot of strain on the chopper. There's a reason Federal makes theirs out of aluminum, the material needs to be able to...

Whoa, 8 inches? So I CAN 3D-print a full-size Model 2 then! Good to know

I'm sure that's probably intentional. The sound is angled upwards so aircraft overhead can hear the siren

I had no idea Skil made sirens! I only know them for their power tools. Neat!

I'm in a similar situation, and I'm seriously considering a military surplus genset. A MEP-805a 30 kW genset would provide plenty of 3-phase juice for an old 10-horsepower siren, and can handle the current needed to get the siren going. Of course you'll need a trailer or something able to tow one of...

Ever since a few months ago when my 9yr old was very startled by an emergency test of our towns siren he has been hyper focused on learning about models, tones and patterns, etc. He's told me ALL about it. I don't see any books available, im not sure where to go looking for content, he has been stu...

1) Make a non-rotating stator to attach to the drill somewhere. The stator should have a single row of ports at a minimum - how many ports is up to you. For reference, I think Federal Signal's Model 2 is currently made with 5 ports. 2) Make a rotating rotor with the same number of ports as the stato...