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The Cyclone was designed in 1968 by Jim Biersach. It is an omnidirectional, dual tone siren that was primarily intended for Civil Defense warning purposes, but was and is currently used for other outdoor warning purposes.
The first version of the Cyclone was called the Cyclone 120. This siren used a 40 horsepower motor, and produced a sound output of 120 dB at a distance of 100 ft.
In 1980, the Cyclone was redesigned and renamed the Cyclone 125. It received a new rotor/stator assembly and a new 50 horsepower motor. These changes raised sound output to 125 dB at 100 feet. The Cyclone 125 also featured some cosmetic changes to accommodate the new rotor/stator and motor.
|Years||Type||Motor HP||Rotor/Stator interval||Notes|
|1968–1970||Cyclone 120||40 HP||8-12 port||Uses a stator with angled bottom-row ports that went on to be used in the P-50 rotating siren. Only one Cyclone 120 of this version is known to exist, and is still active in New Richmond, Minnesota.|
|1970–1980||Cyclone 120||50 HP||8-12 port||Stator intake has a large air valve underneath it.|
|1980-2007||Cyclone 125||50 HP||8-12 port||Parallel stator, increased the decibel rating by 5. No longer in production. |
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