The Siren Board

First off, some of you may remember the small little gray siren I purchased off ebay. Well I am done modifying it and here are the videos of my finished product. If you want to learn more about this siren and see what it looked like when I first got it go to this thread

http://www.airraidsirens.com/forums/vie ... php?t=3103

Now for the videos, they were filmed with a cell phone so the quality isn't all that great.

Attack: http://www.youtube.com/watch?v=0x-B3fVyybA

Growl: http://www.youtube.com/watch?v=3JTeFH_SxKA

Alert: http://www.youtube.com/watch?v=TlKYzIKJRoc

I like the sound of that siren. It's probably lower pitched because of the curved roter. Curved roters can turn at a lower RPM and produce a much louder sound output than a straight roter turning at the same RPM. The only bad thing about curved roters is that they use a lot more electricity than straight roters.

The pitch actually depends on the number of chops per second, not the geometry of the vanes in the rotor.

Nice rain-cap, too!