International Shipbuilding Progress - Volume 11, issue 114

Authors: Klaassen, H.

Article Type: Research Article

DOI: 10.3233/ISP-1964-1111401

Citation: International Shipbuilding Progress, vol. 11, no. 114, pp. 45-58, 1964

Authors: Clement, E.P.

Article Type: Research Article

Abstract: A previous report by H.F. Nordstrom gives comprehensive information about the hull forms and resistances of a considerable number of round-bottom boats. This earlier report also shows that the resistance of these craft is determined mainly by the value of the hull form parameter, L / ∇ ( 1 / ( 3 . Data on round-bottom boats from a number of other sources were examined to see if they could be correlated with the Nordstrom data. It was hoped thereby to produce graphs which would be useful for the prediction of …boat performance for a wider range of speeds. A report by Marwood and Silverleaf was found to contain data which could be used to prepare a series of graphs useful for predicting the resistances of boats of a wide range of sizes up to quite high speeds. The data from the other sources examined was found to be of little value for the present purpose. Generally this was either because of the evident presence of liminar flow on the models, or because the models were fitted with skegs of unknown size and of unknown influence on the resistance. Show more

DOI: 10.3233/ISP-1964-1111402

Citation: International Shipbuilding Progress, vol. 11, no. 114, pp. 59-72, 1964

Authors: Thorneycroft, D.R. | Heath, D.J.

Article Type: Research Article

DOI: 10.3233/ISP-1964-1111403

Citation: International Shipbuilding Progress, vol. 11, no. 114, pp. 73-84, 1964

Authors: Kumai, Toyoji | Tomita, Tetsujiro | Tasai, Fukuzo | Suhara, Toshiro

Article Type: Research Article

Abstract: The present report provides the experimental study on the measurements of propeller forces exiting hull vibration by use of self-propelled model. The special considerations are given for measuring the components of the reactions of propeller shaft at the bearing, and surface forces applied at the end parts of the stern as well as those of the thrust and torque variations. The experiments were carried out by making model ship selfpropel along about 200m straight course in a reservoir, where manipulation, operation of the meters equipped in the ship and recording were all conducted by wireless instructions. The effects of …number of blades of propeller on the vibratory exciting forces on the ordinary stern and Weser stern are obtained by replacing 3, 4, 5, and 6-bladed propellers for two models. The effect of screw aperture on the vibratory propeller forces in the ordinary stern is also obtained. Show more

DOI: 10.3233/ISP-1964-1111404

Citation: International Shipbuilding Progress, vol. 11, no. 114, pp. 85-95, 1964