Abstract: Research on nonlinear dynamics of Micro Air Vehicles (MAV) plays an important role in MAV design. The Aerodynamics of MAV is under a serious influence of Low Reynolds Numbers because of its micro size and low speed. Furthermore, its special design in configuration makes it more different from other aerocrafts in characters of flight dynamics. A group of piecewise linearized dynamic equations based on low Reynolds Numbers tunnel testing are used to study the flight qualities of MAV, furthermore, a new method for calculating the dynamic derivatives of flying wing aerocrafts is presented.The nonlinear transformations of flight dynamics characters in different flight states are discovered, which provide the necessary mathematical model for autonomic flight control for MAV.

Key words: flying wing MAV, nonlinear flight dynamics, low Reynolds numbers tunnel testing, flight qualities, dynamic derivative