*† ‡ The design of a continuous operation transonic research turbine facility is described. The purpose of this turbine rig is to provide an environment for the development of performance enhancing flow control technologies at conditions that are similar to those in real engines. The unique design features include using the power generated by the turbine to load-share with a motor to drive a centrifugal compressor which supplies the air to drive the turbine, and re-circulating most of the compressor discharge air to the turbine inlet to control the inlet temperature. The facility, as defined by the characteristics of the 500HP drive motor, centrifugal compressor, and piping system, can be used with a wide range of turbine blade designs. A number of design points are described based on a mean-radius analysis. High loading axial turbines can be tested in this facility at a pressure ratio of 2.1.