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The helicopters circle at a radius of 6 km from the auditorium, changing altitude constantly to create the 'bounce' of the piece. All twelve incoming signals are controlled by the sound crew. [18] The descent lasts five minutes, with the decreasing sound of the rotor blades acting as a background as the quartet re-enter the hall.
The Kopp–Etchells effect is a sparkling ring or disk that is sometimes produced by rotary-wing aircraft when operating in sandy conditions, particularly near the ground at night. The name was coined by photographer Michael Yon to honor two soldiers who were killed in combat; Benjamin Kopp, a US Army Ranger, and Joseph Etchells, a British soldier.
The song is approximately one minute, 46 seconds in length, beginning with 24 seconds of a helicopter sound effect, followed by the schoolmaster shouting, "You! Yes, you! Stand still, laddie!" performed by Roger Waters. Waters's lead vocal is treated with a reverse echo. The song features an electric guitar with an added delay effect and an ...
The wires are about 0.25 millimetres (0.010 in) thick, and support about 10 kilograms (22 lb) each; the arrays contain more than enough wires to support the performer's weight. The wire arrays are mounted at the hips, near the human center of mass, to a harness worn under the clothing.
By October 2018, the in-service and stored helicopter fleet of 38,570 with civil or government operators was led Robinson Helicopter with 24.7% followed by Airbus Helicopters with 24.4%, then Bell with 20.5 and Leonardo with 8.4%, Russian Helicopters with 7.7%, Sikorsky Aircraft with 7.2%, MD Helicopters with 3.4% and other with 2.2%.
Helicopter noise reduction is a topic of research into designing helicopters which can be operated more quietly, reducing the public-relations problems with night-flying or expanding an airport. In addition, it is useful for military applications in which stealth is required : long-range propagation of helicopter noise can alert an enemy to an ...
In music, a drone is a harmonic or monophonic effect or accompaniment where a note or chord is continuously sounded throughout most or all of a piece. A drone may also be any part of a musical instrument used to produce this effect; an archaic term for this is burden (bourdon or burdon) [1] [2] such as a "drone [pipe] of a bagpipe", [3] [4] the pedal point in an organ, or the lowest course of ...
Low-flying, high-speed military aircraft produce especially loud aerodynamic noise. The shape of the nose, windshield or canopy of an aircraft affects the sound produced. Much of the noise of a propeller aircraft is of aerodynamic origin due to the flow of air around the blades. The helicopter main and tail rotors also give rise to aerodynamic ...