Fundamentals of lift and drag , Other Engineering

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Lift and drag are merely the resolved components in specific directions of a resultant aerodynamic force caused by the relative velocity V of the vehicle through the air.
If all one were concerned with was the rigid-body motion of the aircraft, then the pressure and shear-stress distributions caused by the flow could be entirely represented by a single force acting at the centre of pressure (CP).
The CP is not a fixed point; it shifts with AoA, flow condition, and other variables.
The force of lift is, by definition, perpendicular to V.
The drag of lift is, by definition, parallel to V.
We shall assume that the thrust generated by the engines acts parallel to V.
For performance analysis, moments will often be in balance and one can treat all the forces as though they acted at the centre of gravity (CG).

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