The Siren Board

I had no idea the High/Low & Pulse signals would strain the motor. I guess from having the air-flow blocked by 50% when one or both solenoids are activated.

I'm surprised you can hear the motor, either it's very loud or standing under a siren is a lot less dangerous than one would have assumed.

Awesome video, DjT. Is there a full-video of it performing a High/Low test with that broken solenoid or any future possibility of one?

Great video of a great siren.... I wanna work for SiraTech now lol...

To heck with the blower operation. To me the most interesting thing about that siren is the cage ladder going up that air pipe. Now that's cool!!!

Listening to this video tells me that the six-port row must be on the top of the chopper, because inside the rotor, when you have the bottom row open, the blower's air going through that row is going to be compressed by the air circulating in the top row, which is closed momentarily, so you'll have pressure building, because there's only a certain amount of air that the blower can expel under a certain rotor-speed. Think about a rotor with really small ports compared to a rotor with larger ports - the rotor with the smaller ports is going to put more pressure on the blower, though what I just said is only partially an analogy, 'cause that and a Thunderbolt's HI-LO operation are worlds different!
Then, when you have the top row of ports open, there is no air above it to cause pressure buildup, and you also have somewhat greater suction of the chopper.

Wait, I've just seen a picture, and the row with more ports IS on the top. I'm right. LOL!

I get the willies seeing him walk around that blower like that. If anyone were to trip and fall onto a running blower, it would be quite a severe dismemberment.

We have an old Westinghouse air compressor with a 5hp Tri-Clad motor which would probably do the same thing to you.

SirenMadness wrote:Listening to this video tells me that the six-port row must be on the top of the chopper, because inside the rotor, when you have the bottom row open, the blower's air going through that row is going to be compressed by the air circulating in the top row, which is closed momentarily, so you'll have pressure building, because there's only a certain amount of air that the blower can expel under a certain rotor-speed. Think about a rotor with really small ports compared to a rotor with larger ports - the rotor with the smaller ports is going to put more pressure on the blower, though what I just said is only partially an analogy, 'cause that and a Thunderbolt's HI-LO operation are worlds different!
Then, when you have the top row of ports open, there is no air above it to cause pressure buildup, and you also have somewhat greater suction of the chopper.

Wait, I've just seen a picture, and the row with more ports IS on the top. I'm right. LOL!

I had to read that twice!

Basically, when the bottom row is open, you have the air from the blower fill the whole chopper, as always, though the top row, which is closed, applies pressure to the bottom row with the air circulating in the top of the chopper. However, when the bottom row is closed, the top row being opened allows all the air to escape with less pressure buildup.