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SYN ACK wrote:
we stated this on the first page :)
No, the cause was incorrectly stated as: "When brea[k]ing the sound barrier,..." and this effect is not related to the sound barrier, but rather is dependent on the temperature, pressure (fluctuations) and presence of sufficient a quantity of water molecules to condense. Refer to "Prandtl-Glauert Singularity" for detailed explanation. The only connection is that an appropriate pressure differential is more likely with, but not required by, the aircraft reaching Mach 1. In fact, most examples of this phenomenon are cited as "slightly subsonic".
I maintain that an airshow demonstration at low altitude, over land, and in a populated area, would not involve supersonic flight.
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