Vortices And Aerodynamic Contrails
From A Landing Boeing 777
The Boeing 777 is the most commonly used widebody airliner in the world and was the first commercial aircraft designed entirely by computer. Each of the engines of the aircraft is larger in diameter than the cabin of a Boeing 737. The origin of the vortices is a consequence of the generation of lift by the wings. Wing-tip vortices are created by spanwise airflow over the upper and lower surfaces of a wing and are direct consequence of the generation of lift. The aerodynamic contrails occur when moist air cools due to lowered pressure, condensing humidity in the air and forming a visible cloud.
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Jetman and the Emirates A380
The Ultimate Flight Formation
The Emirates A380 and Jetman Dubai took to the skies of Dubai for a unique formation flight which showcases just how far aviation has come. The formations were conducted over the Palm Jumeirah and Dubai skyline with Burj Khalifa in the background. The choreographed aerial showcase involved the aircraft flying at 4,000 feet in two holding patterns. The A380 was then joined by the Jetman Dubai duo, experienced pilots and operators of the smallest jet propelled wing, who were deployed from a helicopter that hovered above the aircraft at 5,500 feet
Aerobatic Pilot Matt Hall Recovers From a Stall in a Red Bull Air Race
During the accelerated stall the pilot rolls the aircraft into a banked turn and while keeping the aircraft coordinated, firmly applies back pressure. The aircraft then suddenly stalls, pitches down and the pilot has to recover. That occurs well above published stall speed. The reason is that when you are in a banked turn, the wings generate horizontal lift to turn as well as vertical lift to balance weight. That extra horizontal lift is created by increasing angle of attack. In brief, when turning you generate more lift and fly at a higher angle of attack (AoA) than in level flight at the same airspeed. That means you're closer to your critical angle of attack during a turn, and you can stall at a higher airspeed.