Logistically, this Thunderbolt isn't odd, but its mount is rather unique. I do actually appreciate the way how it was made with maintenance access in mind. They can't be using the ladder that much. The paint condition speaks to that :lol: I always thought siren mounts with a maintenance platform we...

Thanks for the picture! That siren looks sharp! Maybe it does actually work? There's a beefy plug wired to it after all! They probably have 3-phase power on site to fire it up.

Is the siren actually in the museum as an exhibit, or is it mounted outside somewhere? There's a historic WW2 museum hangar that has a working coded Fedelcode Model 5 that's mounted atop a building and controlled by the museum. Wendover Army Airfield is the place.

In theory, it could be possible to mount a simple siren upside down. You would need very strong bolts, and depending on the size of the siren you might need even longer bolts or extra reinforcement. Gravity would be pulling the siren down just the same as if it were mounted right side up, to it cou...

You'd need a genset the size of a car to run one of these. They pull 900 amps at startup on 208 volt 3 phase. On 240 3 phase, it's around 500 amps on startup. On 480 3 phase, it's much less at 200 amps to start the siren. That 50 hp motor is a pig and requires so much energy to start. Good to know!...

I'm seeing the images just fine

This looks to be a very early Federal Enterprises era Model 5 (single phase as well), especially as it does not have any holes cut in the stator top to attach coding gear. When you look on the shroud for a motor tag, also look for another large badge that says “Fedelcode” or “Federal”, as if it has...

It's amazing how far sirens have come in innovation. It takes far less power to run a T-135DC than that old P-50.

I wouldn't mind having a P-50 in my back yard though - I could get a big enough genset to run it =D

Very nice restoration! I saw a video of one of these units on YouTube the other day. I had no idea they were a thing until then.

Thanks for sharing your progress! That bolt in the last pic looks pretty gnarly! For heating up frozen fasteners, a tool I'd like to get is an electric induction coil that wraps around a nut or bolt hex. I read about it in a Hagerty news article. It would beat burning up everything else around the f...