Compressibility by Blechnik
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Description
When flow velocities are not too far from the speed of sound, density and temperature change with pressure. When the flow is accelerated streaming around an airfoil or any other body, all three parameters will decrease as energy is transfered into dynamic pressure. This is especially the case within the core of a strong vortex. Sometimes, when humidity is high enough, vapor condensates in regions of low pressure.
This was the case when a Bundeswehr-Transall visited the aerodrome of Aalen-Elchingen during the idaflieg summer meeting 2008.
Panasonic Lumix FZ-50 (27 aug 2008)
no postwork (except for resizing)
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Comments (5)
ronmolina
Wild looking and interesting. I have never seen anything like it but understand what you said.
Blechnik
Funny thing is, it looks even different when you just stand beside the runway. The human eye is to slow to recognize the single vortices spooling around the prop shaft. All we could see was just a tube-like cloud shaped like a wind bag.
Richardphotos
I enjoy very much hearing/seeing these behemoths taxing and flying very unusual capture
whaleman
Nice capture, it is always a pleasure when you get this, which is not very often!
nikolais
great shot!