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Thread: Random Picture Thread V

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    Destroyer of Worlds MotherPuck's Avatar




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    Anything worth shooting is worth shooting twice. Bullets are cheap. Life is priceless.


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    This stunning National Geographic photo contest winner shows an F-15 banking at an airshow and a array of great fluid dynamics. A vapor cloud has formed over the wings of the plane due to the acceleration of air over the top of the plane. The acceleration has dropped the local pressure enough that the moisture of the air condenses. Some of this condensation has been caught by the wingtip vortices, highlighting those as well. Finally, the twin exhausts have a wake full of shock diamonds, formed by a series of shock waves and expansion fans that adjust the exhaust’s pressure to match that of the ambient atmosphere. (Photo credit: Darryl Skinner/National Geographic; via In Focus; submitted by jshoer)
    Anything worth shooting is worth shooting twice. Bullets are cheap. Life is priceless.


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    Ever look out an airplane’s window and wondered why a row of little fins runs along the upper side of the wing? These vortex generators help prevent a wing from stalling at high angle of attack by keeping flow attached to the surface. Airflow over the vanes creates a tip vortex that transports the higher-momentum fluid from the freestream closer to the wing’s surface, increasing the momentum in the boundary layer. As a result of this momentum exchange, the boundary layer remains attached over a greater chordwise distance. This also increases the effectiveness of trailing-edge control surfaces, like ailerons, on the wing. (Photo credit: Mark Jones Jr.)
    Anything worth shooting is worth shooting twice. Bullets are cheap. Life is priceless.


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    Anything worth shooting is worth shooting twice. Bullets are cheap. Life is priceless.


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    Kings Provisional and empire like this.
    Anything worth shooting is worth shooting twice. Bullets are cheap. Life is priceless.


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    Anything worth shooting is worth shooting twice. Bullets are cheap. Life is priceless.


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