Scale effect experiments on victory ships and models¹

Subtitle: Part I. Analysis of the resistance- and thrust measurements on a model family and on the model boat D.C. Endert Jr.

Article type: Research Article

Authors: van Lammeren, W.P.A. | van Manen, J.D. | Lap, A.J.W.

Affiliations: Netherlands Ship Model Basin at Wageningen

Note: [1] Paper read at the Autumn Meetings of the Institution of Naval Architects in Torquay on September 22, 1954.

Abstract: This paper deals with the resistance- and thrust-measurements on a series of nine geometricall similar Victory ship models, ranging in scale from 160 to 18, and on a Victory model boat of scale 6. The first part of the paper gives a description of the ship, the propeller, the models, the test apparatus, the test performance, the instrument calibration and the necessary corrections. The measured resistance and thrust values of the model boat are correlated with the results of the tests with the models using three methods, i.e. the Schoenherr, the Hughes, and the Lap-Troost extrapolators. The results of experiments for the determination of the wall-interference are given. These experiments are on the principle of the “image method”. An attempt is made to analyse the thrust deduction factors as a function of the Reynolds number. Conclusions and a programme for the continuation of the tests are presented at the end of the paper.

DOI: 10.3233/ISP-1956-31802

Journal: International Shipbuilding Progress, vol. 3, no. 18, pp. 77-108, 1956