UNDERSTANDING THE DYNAMIC BEHAVIOR OF THE SATELLITE BODIES AND DISTRIBUTED CONDUCTIVE TETHER ARE CRITICAL TO LONG-RANGE DESIGN AND DEVELOPMENT OF THE E-SAIL CONCEPT. THE PRIMARY OBJECTIVES OF THIS MODEL ARE TO FIRST CHARACTERIZE THE SYSTEM PERFORMANCE DURING THE DEPLOYMENT TRANSIENT EVENT EVALUATE PERFORMANCE CHARACTERISTICS DURING OPERATION AND TO IDENTIFY ANY AREAS OF INSTABILITY THAT POSE A THREAT TO STABLE OPERATION. THIS TASK FOCUSES ON CONTINUED DEVELOPMENT OF THE TENNESSEE TECHNOLOGICAL UNIVERSITY (TTU) TETHER SIMULATION MODEL. THE TTU TETHER SIMULATION WILL BE USED TO MODEL THE KEY OPERATIONS INVOLVED IN TETHER SAIL ORBITAL MAINTENANCE AND MANEUVERING OPERATIONS. IT SHOULD BE NOTED THAT THE COMPLETE DYNAMIC BEHAVIOR OF TETHER DEPLOYMENT SYSTEMS PRESENTS CHALLENGES TO PLANNING AND DESIGN OF TETHER-BASED STRUCTURES SUCH AS COUPLING BETWEEN TRANSVERSE AND LONGITUDINAL MODES OUT-OF-PLANE LIBRATIONS AND POTENTIAL CHAOTIC EVENTS AS A FUNCTION OF INITIAL CONDITIONS. THIS STUDY WILL BRING TOGETHER AND IMPLEMENT MODELS FOR THE TETHER/SAIL SYSTEM IN THE LIGHT OF THE CURRENT DYNAMIC MODEL THEORY TO IDENTIFY A COMBINATION OF THE FEASIBILITY AS WELL AS THE PRIMARY RISKS THAT NEED TO BE ADDRESSED IN DEVELOPING THE TETHER/SAILS CONCEPT.