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From: Dale Brunson <dbrunson@owt.com>
Hey Gang, here is a special treat!
Every so often, just the right combination of conditions and events
occur to create an unbelievable event, in this case an F-18 passing
through the sound barrier./snip/
Enjoy - Dale
... "Sharp angled sonic cones"
only exist when an aircraft is significantly exceeding the speed of sound.
At slightly above the speed of sound, doesn't the shock wave look just
like the cloud in the photo: like a disk?...
William J. Beaty