![]() The aerodynamics of the wings, empennage, airframe, etc., are not considered in individual detail but can be represented as total lift, drag, and pitching moments on the aircraft. ![]() Resolving the forces to the center of gravity is convenient for initial analysis. Remember that when an object moves along a curved flight path, the motion is called curvilinear compared to the case where it moves in a straight line path, which is rectilinear.Īn airplane following a curvilinear flight path with pitch angle and bank angle. ![]() In this initial analysis, the aircraft can be replaced by a point mass at the center of gravity (c.g.) following a curvilinear flight path, as indicated in the figure below. The objective is to describe the airplane’s movement through the atmosphere using equations that physically describe its curvilinear motion, thereby allowing its performance and other capabilities to be evaluated. The overall approach is relatively easy but requires the careful application of the principles of statics and dynamics. To analyze an aircraft in flight, the equations that describe its motion must first be set down in terms of lift, weight, drag, and propulsive force (i.e., thrust).
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