Fundamentals of UAV Flight Control Theory

UAV balance:

The force acting on the aircraft must be exactly balanced, that is, the resultant force is zero. According to Newton's second law, if the resultant force is not zero, the aircraft will produce acceleration.

For convenience, all forces on the aircraft are decomposed into X, Y and Z axis forces, and all bending moments on the aircraft are decomposed into bending moments around X, Y and Z axis.

Unbalanced bending moment will cause rotation. Here X, Y and Z can be redefined. The aircraft with unbalanced bending moment in X axis will roll, the aircraft with unbalanced bending moment in Y axis will pitch, and the aircraft with unbalanced bending moment in Z axis will yaw.

Application of Bernoulli's law to fixed wing aircraft:

Briefly, the higher the air flow velocity is, the lower the pressure on the wing is. On the contrary, the lower the velocity is, the greater the pressure is. The wing structure makes the air velocity on the upper part of the wing faster, while the pressure is smaller. The air velocity on the lower part of the wing is slower, and the pressure is larger. So the wing is pushed upward

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