Category:Pnuematic Sirens

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A Pneumatic siren is a siren that is similar to an electromechanical siren ,except it has a rotor that has no vanes ,requiring an external air source to feed air to the chopper in order to be loud. The rotor can either be a disc with four slots ,or a cylinder rotor like an electromechanical siren that has no vanes.

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