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I don't know about all that, but if you stand at 1 focal point of a room made in an ellipse shape and wisper, someone standing at the other focal point can hear you clearly. Sonar is just sound, so it stands to reason it has to reflect like a pool ball.
-Bert
The glass is not half full or half empty, Its twice as big as needed for the job!
http://foamcasualty.com/ - Warbird R/C scratch building with foam!
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