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The design of a model pod test unit is described and some experimental results are presented. The test unit includes instrumentation to measure total unit thrust, propeller thrust and torque at the hub, thrust at the end of the propeller shaft, pod shell drag, and local pressure in the gap between the pod shell and the rotating propeller hub. The design of the test unit accommodates several types of experiment, including a series of tests with different pod shell geometry and another series of tests with different propellers. The unit can operate in push and pull modes, and can be used in oblique and transient flow conditions. It is designed to facilitate rapid changes in test configurations. Results are presented of some preliminary experiments in which the effects of gap distance and gap pressure on measured thrust were evaluated. An uncertainty analysis is included.
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