Replies

To: Pete from Shawnee Mission

They sound like harmonics from the exhaust of a hypersonic engine :)

115 posted on 05/17/2015 9:27:15 PM PDT by The Antiyuppie ("When small men cast long shadows, then it is very late in the day".)

To: The Antiyuppie

I have heard plenty of regular jet engines, never a hypersonic engine. Are you thinking of Blackbird or something like that?

145 posted on 05/18/2015 6:19:06 PM PDT by Pete from Shawnee Mission

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