Sinopsis
Aerodynamics is the science concerned with the motion of
air and bodies moving through air. In other words, aerodynamics is a branch of
dynamics concerned with the study of motion of air, particularly when it
interacts with a moving object. The forces acting on bodies moving through the
air are termed aerodynamic forces. Air is a fluid, and
in accordance with Archimedes principle, an aircraft will be buoyed up by a
force equal to the weight of air displaced by it. The buoyancy force Fb will act vertically
upwards. The weight W of the aircraft is a force which
acts vertically downwards; thus the magnitude of the net force acting on an
aircraft, even when it is not moving, is . The force will act
irrespective of whether the aircraft is at rest or in motion.
Now, let us consider an aircraft flying with constant speed V through still air, as shown in Figure 1.1, that is, any motion of air is solely due to
the motion of the aircraft. Let this motion of the aircraft is maintained by a
tractive force T exerted by the engines.
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