A rake of five "5-hole" directional Pitot tubes (actually "6-hole" because static taps are included) was calibrated for angular sensitivity, as well as velocity, in a towing tank. This was accomplished by deploying the raek on a tubularshaft out of the bow of a propeller bost. Combinations of propeller boat yaw angle and rotation angle of the rake shaft provided a full and systematic coverage of flow angles in tangential and radial planes of each probbe. Thirty singleended pressure transducers were used, one for each hole in each of five probes, to measure pressures. The transducers resided below the waterline, aking air purging practical. Calibration required forty one runs.
展开▼
