Gino wrote:It's mechanics is just like an rc helicopter collective. It is a mechanical system that can change the angle of the blades. Just Google up how swash plates work with helis. The motor shaft spins in one direction. By collectively varying the angles of the blades, you can change the pitch. The pitch can either blow air in front,to the back, or no air at all (zero pitch). With the rapid ability to blow air in front and back, you now have the dynamics of a woofer. In rc helis we can fly upright and inverted thanks to this. I can tell you first hand that this device can produce serious blasts of air with rapid transition from positive to negative pitch.
The picture suggests the main body is the motor.In front of that is a magnetic actuator to vary pitch. I am assuming it's magnetic because of the torque involved. In front of that is rotor head with mechanicals to individually and collectively change blade pitch from negative to positive.
Hmmmm... so it's in the speed of the rotation that determines the volume of air that will agitate, in order to reproduce the same intensity that of a regular cone woofer driver, given a specific frequency Now I understand