Other articles indicate that it's a notch filter ( single freq) , so even if it works, it's of limited practical use. And sound is energy, as the article correctly states. If it goes in but doest come out, and isn't converted to heat, where does the energy go?
Charlie
On Mar 12, 2019, at 4:20 PM, "Ernest Christley echristley@att.net" < flyrotary@lancaironline.net> wrote:
I don't know if it is real or not, but this would solve a host of rotary problems:
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