As the joint study of the I. T. T. C. Resistance Committee, the standard model made of laminated fibre-glass was tested in the Mitsubishi Experimental Tank (Nagasaki) and also in the T. T. R. I. and Japan Defence Agency Tanks. Fairly good agreement between the resistance curve obtained in the N. P. L. Tank and that in the Mitsubishi Tank is obtained, if the blockage effect is corrected appropriately. No storm phenomenon has been seen during the test period of two years. It seems that there is no relation between the variations of resistance and the time of experiment, water temperature and the depthwise distribution of the water temperature. The standard variation of the measured resistance coefficient for these two years is about 1%.