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Old 10-17-2020, 10:36 AM   #61 (permalink)
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Quote:
Originally Posted by freebeard View Post

My impression has been that a serrated edge affect mostly the acoustics.
Bingo! Give the man a cigar. Low Airport noise is so important that they will alter thrust and increase drag levels to accommodate. Ever notice at altitude and high speeds you can hear them for a fifty mile arc?

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Old 10-22-2020, 02:03 PM   #62 (permalink)
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I've done some research into this topic and modified my hovercraft to suit, so I feel that I have first hand experience.

Acoustics is indeed what it is all about.

Also if you think about it, sound is energy so there are relationships to be explored.

In fact I just posted a link to a video where sound is studied in a wind tunnel for transition noise.

About the halfway mark, the young woman mentions it.

https://youtu.be/-QvLeBlX5XU

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