Reverberating mechanical siren

A Mechanical Siren 1 comprising an electric motor 2 driving through a clutch 8, a stator;

• and a rotor 3, having a plurality of pumping channels 12 having spiral ramps 28 disposed between said rotor's blades substantially at right angles to said blade's walls, said ramps angled substantially at 45 degrees to a rotor axis of rotation, so as to change direction of rebounding sound waves 21 from radially inward to directly out through an angled throat 5 and nose 35 in one single rebound, said rotor 3 mounted with bearings to promote coasting, said rotor 3 further comprising a front ring 29 with a front ring width, a rear rotor disk, with a rear rotor disk width 24, a stator blank space circumferential overlap with a width 18, and widths 26 and 27 beside either side of said rotor pumping channel 12, wherein said width measurements are all substantially equal, forming equal width air dams surrounding pumping channel 12, to decrease rebound air leakage, substantially preserving acoustic energy imparted to said rebounding sound waves 21, said stator 9 having multiple window openings 11 corresponding in size to said rotor pumping channels 12, said window openings 11 being formed by plural slots 15 substantially parallel to a siren axis of rotation and radial to said siren axis of rotation's center, said slots 15 having bars 16 with under cuts 17, so that said bars 16 are spaced away from a bore of stator 9, thus said slots 15 and bars 16 do not change siren pitch because of additional openings and closings with rotor 3, said rebounding sound waves 21 combine as a spiraling pulsing wave 22 to exit through said nose 35 with its angled intake throat to guide said rebounding sound waves 22 in an expanding pattern without cavitations and eddy currents.