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Shockwaves, and the Beauty of Supersonic Flight
Schlieren photography has been used for decades to visualize shockwaves generated by supersonic aircraft - creating some iconic images of which my avatar is just one example - but usually it is used with scale models in windtunnels. Now NASA has captured the shockwaves from full-size aircraft flying supersonically, using ground-to-air schlieren photography. (www.aviationweek.com) Ещё...Happens a lot in industry. They don't like competitors learning.
this is the link
http://www.youtube.com/watch?v=TVzsG93q_Ko