The Siren Board

Why did Federal Signal change the 2001 to have a rectangular chopper housing instead of keeping the same design as the SRN*B (square chopper housing)?

I think Federal did that just so the two could be distinguished between each other. I don't think the taller box has any real improvement on performance, meaning, or purpose.

Just to let you know, there are smaller 2001-130 pictures you could've used.

the 2001-SRN and SRNB had a support beam which ran directly across the chopper inlet, (see Rick K's photos here) which restricted airflow. I think the taller inlet box on the -130 either got rid of that beam or had a different one which was out of the way of the chopper intake.

sirendude2012 wrote:Just to let you know, there are smaller 2001-130 pictures you could've used.

I know I just wanted to use my photos but the 130 came out huge but I don't know how to re-size it here.

Jim Z wrote:the 2001-SRN and SRNB had a support beam which ran directly across the chopper inlet, (see Rick K's photos here) which restricted airflow. I think the taller inlet box on the -130 either got rid of that beam or had a different one which was out of the way of the chopper intake.

I don't know but There's a -130 near me and every time I see it, it leans forward. I guess thats from too much weight on the front even though its installed leveled correctly.

oh, and the -130 raised the chopper inlet above the collector ring housing (which is just a modified Thunderbolt chopper tube.)

Jim Z wrote:oh, and the -130 raised the chopper inlet above the collector ring housing (which is just a modified Thunderbolt chopper tube.)

Ok that makes a lot more sense thanks for the information.

Thanks Jim, I ended up adding that information to the wiki. Does anyone happen to have pictures of a 2001-130 with the housing removed?

Jim Z wrote:the 2001-SRN and SRNB had a support beam which ran directly across the chopper inlet, (see Rick K's photos here) which restricted airflow. I think the taller inlet box on the -130 either got rid of that beam or had a different one which was out of the way of the chopper intake.

Is this why most 2001s aren't loud enough?

floor-a-matic wrote:Is this why most 2001s aren't loud enough?

The main factor in that is the frequency they sound at. Their high pitch (often between 700 and 755 hertz) doesn't carry very well when air is the sound medium.