This book present the design methodology and realization of the Quad-Copter, a model aircraft based on a four-propeller design. The Quad-Copter can be controlled by radio transmission. Flight stability of the Quad-Copter is achieved using a five degrees of freedom (DoF) inertial measurement unit (IMU). Sensor data is integrated and processed using a proportional-integral-derivative controller (PID controller), a feedback loop maintained by an on-board Arduino microcontroller. All subsystems of the Quad-Copter are designed to minimize weight and cost where practical. - Also fixed an IP Camera which used for some of image processing applications using OpenCV library such as :- Object Tracking includes Car and Face Detection. Face Recognition.