International Shipbuilding Progress - Volume 6, issue 60

Authors: Kerwin, J.E.

Article Type: Research Article

Abstract: In this paper, the well-known hydrodynamic solution for an optimum open-water propeller is applied to the case where the performance of a given propeller is to be determined at one or more specified advance ratios. Although this was accomplished basically by working the design method backwards, it was found that a re-analysis of portions of the procedure were necessary in order to permit its application in the more general case. The procedure was programmed for the IBM 704 Computer, and calculations were made for twenty-one B-Series propellers. These results include K T , K Q and η …over the normal range of J values, as well as the radial distribution of the significant hydrodynamic quantities at each J value calculated. A comparison of these results with the original B-Series test data indicates reasonably close over-all agreement between the two. However, in many instances large discrepancies exist, indicating that existing techniques are not entirely satisfactory, even in the ideal case of an essentially optimum open-water propeller. Show more

DOI: 10.3233/ISP-1959-66001

Citation: International Shipbuilding Progress, vol. 6, no. 60, pp. 343-354, 1959

Authors: Völker, H.

Article Type: Research Article

Abstract: Economy of a technical object is composed of numerous partial economies of its components. Profitableness is influenced by these economic properties only to a certain extent. The question is whether the ship design should aim at the most economical or at the most profitable ship. It can be shown that in each of these two cases many technical details such as the main dimensions become different. Evidently the true scale for a most advantageous ship is not profitableness (“banker’s criterion”), but the economic efficiency , called here “shipowner’s criterion”. With some simplification this is equivalent to the total …annual cost per value unit produced. Though this cost can only be estimated in advance, its application is the proper means to approach the ideal of the most advantageous ship. Show more

DOI: 10.3233/ISP-1959-66002

Citation: International Shipbuilding Progress, vol. 6, no. 60, pp. 355-360, 1959

Authors: Meijer, M.C.

Article Type: Research Article

Abstract: A description is given of some experiments on partly cavitating hydrofoils, which were intended to check the linearized theory of Geurst for these flows. The results show good agreement between theory and experiment. The experiments indicate an essential difference between partially and fully cavitating flows, which is described in the paper.

DOI: 10.3233/ISP-1959-66003

Citation: International Shipbuilding Progress, vol. 6, no. 60, pp. 361-368, 1959

Authors: Geurst, J.A.

Article Type: Research Article

DOI: 10.3233/ISP-1959-66004

Citation: International Shipbuilding Progress, vol. 6, no. 60, pp. 369-384, 1959