a free surface or fully flooded. Instrumentation includes an updated LDV system for in-depth flow field measurement and correlation with theory for both propellers and foil sections. The latest addition is a special test section for waterjet pump performance analysis.

The Iowa Institute of Hydraulics Research at the University of Iowa in Iowa City, Iowa, has a towing tank 3 m wide, 3 m deep, and 100 m long. The drive carriage and model trailer are cable-driven, with a speed range of 0 to 3 m/s. The drive carriage houses equipment for conventional analog-digital data acquisition such as dynamometers, wave gauges, and multihole pitot probes. There is also instrumentation on board for particle image velocimetry (PIV) data acquisition including a PIV vector processor and hardware for automated movement of traverses for equipment (sensor) positioning. The instrumentation includes a four-channel dynamometer; linear potentiometers for model attitude measurement; capacitance, acoustic, and servo-mechanism probes for wave elevation measurements; differential pressure transducers and multihole pitot probes for flow-field velocity and pressure measurements; and a towed PIV system. The wave maker is capable of generating regular and irregular waves, with wavelengths of 0.25 to 6 m and amplitudes of 0 to 15 cm.