Tuesday, June 5, 2012

A B-1 Low and Fast

The following pictures were taken by Larry Titchenal, on Friday Apr. 27, 2012 during the practice day of the Fort Lauderdale Airshow, in Florida.
Two four-engine variable-sweep wing strategic bombers belonging to the 28th Bomb Wing, based at Ellsworth Air Force Base, South Dakota, made passes around 30 seconds apart.
The first made a high-speed pass whereas the second made a slow pass.

Due to the high speed, the fast pass generated some condensation clouds around the Lancer’s surfaces, engines, and Sniper Advanced Targeting pod. Such clouds are not visual effects of the so called “sonic boom”: when an aircraft flies at transonic speeds (around Mach 1.0), any of its convess parts (canopy, intakes, pod etc.) causes a rapid decrease of temperature and pressure with subsequent creation of the cloud.
The variation in temperature caused by the perturbation of the airflows is called Prandtl-Glauert Singularity.

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