The attitude dynamics simulation of Unmanned Aerial Vehicles (UAVs) is an essential tool for development of autonomous behavior for these vehicles. The paper presents the system identification of a battery powered, finless airship. The mathematical model of the airship is developed based on black-box system identification modeling methodology, where the attitude dynamics of the airship is determined by using the relationship between input and output data collected from a series of outdoor flight tests. The estimated model then validated with data collected from a series of flight test. A PID controller for attitude control of the HAU developed based on this estimated model. Then, simulated in Simulink with the estimated model and implemented in the HAU controller for evaluation via outdoor flight test.