The value of drag coefficient c does not depend on the absolute values of the rate of fall, viscosity, density and temperature, the shape and size of the body, and from some of the dimensionless variables, linking these (and other) parameters, called the similarity criteria. The most important "to their aerodynamics are the Reynolds number Re, which takes into account the effect of viscous properties of air.
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On the property of air to resist moving bodies and the principle of operation is based parachute. The main part of the canopy, experiencing air resistance, is the dome.
Before considering the effect of parachute canopy and get acquainted with the phenomena associated with the fall of isolated bodies in the air, and then try to extend the findings on the motion of the air system of the body - the canopy.
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Define how the vertical velocity of the body when falling in the air. Let the initial time the velocity of a falling body is equal to zero. An example is the drop in the body of the cab captive balloon, falling missiles or parts of the upper point of the trajectory in the vertical takeoff rockets, etc. If the initial time the velocity of the body is zero, and the force of air resistance is zero. The body falls under the influence of the weight of G and its rate of decline is increasing.
Let the body catapulted from a steeply diving aircraft (aircraft, missiles, etc.). At the time of separation from the aircraft velocity of the body equals the rate of the device.
Fast and free http://www.illustratorrecovery.com/ - damaged illustrator fileIf the speed of the aircraft at the time of ejection of the body is less than the critical velocity of the body, as the fall velocity of the body to grow and reached a maximum value, begins to decrease, tending to the critical one.