Abstract
A new ship model basin of Ishikawajima-Harima Heavy Industries Co., Ltd. was established at Yokohama in January 1966. It consists of a towing tank (100m×10m×5m+10m×2m×1.5m), model manufacturing shops and laboratories.The towing carriage is made of steel box girders and its maximum speed is 5m/sec.The remarkable features of this model basin are as follows : (1) The Thyrister Leonard System is adopted to the speed regulation of the towing carriage. Then the sufficient steadiness and setting accuracy of the speed of the carriage are preserved.(2) The application of sequence program with punched cards made possible to simplify the measuring work and only one or two persons are needed for the ordinary experiments.(3) In the self-propulsion tests, the rate of propeller rotation is automatically corrected according to the relative speed between the carriage and the model. By this method the self-propelled model settles into a steady speed in a comparatively short time, therefore in spite of short length of the tank, sufficiently reliable data are obtained.(4) All experimental data in ordinary tests are detected directly by digital transducer.(5) The special detecting mechanism is used for the thrust measurements, which needs no slide coupling and the small displacement of the propeller shaft is converted to the phase difference between a couple of pulses.
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