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A comment on The 'war tubas' we used to spot warplanes before radar (2018). Parent comment

Re:The 'war tubas' we used to spot warplanes before radar (2... by jacquesm on Thursday May 28, 2020 @12:51PM (#23339502)
Not just jets, a regular propeller based plane can have that effect:

https://www.youtube.com/watch?v=4iOoiEbtf2w

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Re:The 'war tubas' we used to spot warplanes before radar (2... by Ididntdothis on Thursday May 28, 2020 @01:02PM (#23339653)
Now double or triple the speed, make it much louder and you have a jet.
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