A complete six-degree-of-freedom dynamic model is addressed for a stratospheric airship. Particular characteristics of the stratospheric airship are introduced. Besides, the airship's equations of motion are constructed by including the factors about buoyancy, aerodynamic force, and added mass. Based on the model, Dynamic stability analysis, control and response simulation of airship are accomplished. The results show that stratospheric airship is stable both in longitudinal and lateral direction within specific bounds of attitude angles. With the control surface and thrust, stratospheric airship is local controllable. The presented model is feasible and it call be used in engineering practice.
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