Hi, Does somebody know how to calculate the air damping force of a hole-plate? The length-width ratio of the plate is from 5:1 to 2:1, and the height of the holes is much larger than its radius. BTW, does somebody have the E-version of the paper"On the acoustical resistance due to viscous losses in the air gap of electrostatic transducers" by Z.Skvor published on "Acustica" 1967 ? BoBo