The captive-trajectory store-separation system of the Aerodynamic Wind Tunnel, Transonic (4T), provides the capability for determining the separation trajectory of a store in the vicinity of the parent aircraft. This system may also be used as a six-degree-of-freedom support for conventional force tests with or without a parent installed, and as a pressure probe or transducer mounting platform for flow field surveys in the vicinity of a model. With the store and parent independently supported in the tunnel, trajectory generation involves measurement of forces and moments acting on the captive store model, converting these to full-scale adding other forces and moments which may be applied to the full-scale store, solving the equations of motion for store acceleration, integrating these equations to find store displacement, converting this movement to model scale, and physically moving the store model along its flight path. This report describes the captive-trajectory store-separation system and its testing capabilities and presents the technique used for trajectory generation. (Author).