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What altitude does sound become invisible?
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<blockquote data-quote="Stratospheric" data-source="post: 79566" data-attributes="member: 15440"><p>Is there any data on noise contour profiles for a spark or other drones? Like the ones they have for commercial jets for airport developments but in miniature! I've also wondered how far away the spark can be noticeably heard from a discretion point of view, not just vertical but lateral distance as well.</p></blockquote><p></p>
[QUOTE="Stratospheric, post: 79566, member: 15440"] Is there any data on noise contour profiles for a spark or other drones? Like the ones they have for commercial jets for airport developments but in miniature! I've also wondered how far away the spark can be noticeably heard from a discretion point of view, not just vertical but lateral distance as well. [/QUOTE]
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What altitude does sound become invisible?