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On a typical aerofoil, a point exists about which the resultant aerodynamic pitching moment M is independent of incidence. This special point is called the Aerodynamic Centre (AC). The numerical value of the pitching moment about AC is denoted MAC. For standard aerofoils in subsonic flows, the Aerodynamic Centre lies approximate ¼ of the chord behind the leading edge (i.e. h=xAC/c ≈ ¼). For supersonic flows, the AC moves abruptly aft to around h ≈ ½; see Fig. 2.2-1. Since MAC is approximately constant over a wide range of CL including zero, MAC is sometimes referred to as the zero-lift pitching moment and denoted M0.
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AUTOMATIC SYNCHRONISING: Automatic Synchronisation uses engine driven synchronising alternators to detect electrically any increase or decrease in a slave engine's speed. Ea
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Expertsmind.com brings you unique solution in physics - What is light? - - Light is an electromagnetic wave that also comes in "photons"
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Drawing operation can also be used for reducing the tube cross-section. The drawing equipment consists of draw bench and die. One end of the tube is pulled through the die over a f
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