Scale effect in the resistance of bossings and shaft brackets¹

Article type: Research Article

Authors: Lap, A.J.W.

Affiliations: Netherlands Ship Model Basin at Wageningen

Note: [1] Paper presented before the Association Technique Maritime et Aéronautique at the Session 1956 in Paris.

Abstract: In general it appears that the resistance caused by well-placed appendages can be split up into frictional resistance and wave resistance. By using the Lap-Troost three-dimensional extrapolator (1), (2) it is possible to separate these two parts. When extrapolating to the actual ship, the scale-effect can then be taken into account automatically. Results of tests with the Lucy Ashton model family fitted with appendages demonstrate the correctness of the new method, as do N.S.M.B. tests on models with and without appendages. Finally a short survey is given of the factors which influence the properties of bossings and shaft brackets.

DOI: 10.3233/ISP-1957-43401

Journal: International Shipbuilding Progress, vol. 4, no. 34, pp. 291-301, 1957