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At NLR, the motion of a partially filled tank is studied for its relevance to the control of maneuvering space vehicles with liquid stores. For numerical simulations a number of computer programs has been developed. An experimental program with investigations on parabolic flight, in suborbital and orbital trajectories has been defined and is in preparation. The present immediate objective is the synthesis of the so-called Wet Satellite Model experiment which includes the development of a diagnostic instrument ('ballistometer') and the launch f a test article in a seven-minute parabola by sounding rocket. A breadboard model has been flown on parabolic flight. The tests of the breadboard have as primary purpose the assessment of the performance of the instrumentation to determine the motion. The instrument will consist of nine linear micro-accelerometers that are arranged about the body. The equations that govern the behavior of the unsupported tank are given and discussed.