Posted on July 8, 2009 at 5:24pm
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This photo was taken by Eric Harrison on 21 June 2009 at the St. Thomas Air Show 2009 in Ontario, Canada. This transonic CF-18 Hornet is flying slightly below Mach 1. The Prandtl-Glauert Condensation Cloud, also called a Prandtl-Glauert Cloud or P-G Cloud, is caused by the Prandtl-Glauert Singularity, a fascinating phenomenon of fluid mechanics.