ABSTRACT
The type of aircraft engine will influence the aircraft turn performance in various aspects. The propulsion and aerodynamics are two wings of flight mechanics that determine the maximum producible load factor, that is, best turn performance. The reason for low aspect ratio in modern fighters is the requirements such as structural consideration, low weight, roll control, and also aerodynamic considerations in supersonic flight. A familiar example for the variations of load factor for a transport aircraft is when the flight pitch angle is varied. The flight path of a pull-out from a dive resembles the lower right quarter of the circle. A very famous case for the weightlessness is the orbital flight by spacecraft. The flight regime of any aircraft usually includes all permissible combinations of speeds, altitudes, weights, centers of gravity, and configurations. The flight envelope has various types; each of which is usually the allowable variations of one flight parameter like turn radius versus another like turn rate.
