Abstract: In this work a comparative study was conducted on the longitudinal dynamics and flight control for four types of aircraft (General aircraft, business aircraft, fighter aircraft and commercial aircraft). We have established the fundamental equations of motion for a rigid aircraft using the laws of mechanical and aerodynamic models. Therefore, an analysis of stability and control is made for every case to determine different dynamic characteristics (longitudinal modes of flight, frequencies and damping coefficients). Also, two kinds of automatic control systems have been designed for four types of aircraft. At the end, some applications are carried on real aircraft models (Cessna 172, M24Learjet, F4C and Boeing 747) and simulation results are presented for each type of aircraft.

Key words: Aircraft, Flight dynamic, Flight control, Stability, Simulation, Modes, Frequency, Damping.