Open water tests of AU-series propeller models varying the number of blades from 4 to 7 were carried out in Experiment Tank of Transportation Technical Research Institute. The tests contained next two series. Series No. I ; Expanded area ratio was kept constant and contour of blade was varied as shown in Fig.1. Series No. II ; Contour of blade was kept constant and expanded area ratio was varied as shown in Table 1. All propeller models have a constant pitch ratio of 0.80. Results of tests are shown in Figs.2 and 3, and results of analysis are shown in other figures and tables.