The AeroSim Blockset is a Matlab/Simulink* block library which provides components for rapid development of nonlinear 6-DOF aircraft dynamic models. In addition to aircraft dynamics the blockset also includes environment models such as standard atmosphere, background wind, turbulence, and Earth Models (geoid reference, gravity and magnetic field). Academic and non-commercial users (such as government organizations) may download the Aerosim Blockset free of charge. The AeroSim Blockset was designed by flight control engineers for flight control engineers. It is based on practical experience in the development of dynamic models for Unmanned Air Vehicles