Hi,
I looked over the patent and i see that this is a really simple concept. Just blow enough air to the vane, the vane claps air to the outside off the box.
At the moment i am also trying to build i servodriven subwoofer(something like the contrabass), already bought several dc servomotors. The downside of the diy-er is that the construction of such loudspeaker is a not an easy task, especially with the belts.
This construction is much easier. Do you know if the rotary vane subwoofer is suitible for pa-use and if a high cut-off to
90/100hz could be reach? It looks to me that this is impossible. What is a typical speed of air when passing the vane in his no-signal position?
Marcel