. The collected papers of Sir Thomas Havelock on hydrodynamics. Ship resistance; Water waves; Hydrodynamics. WAVE RESISTANCE THEORY AND APPLICATION 21 Fig. 9 is from Guilloton's work on stream lines. Fig. 10 shows resistance curves for two models, the calculations being made by the source method. The forms were not experimental models but were actual ships, of high-speed form and not sym- metrical fore and aft. The models were divided into ten compartments and the strengths and positions of the sources determined directly from the plans of the model, the chief point of the work being to show t
. The collected papers of Sir Thomas Havelock on hydrodynamics. Ship resistance; Water waves; Hydrodynamics. WAVE RESISTANCE THEORY AND APPLICATION 21 Fig. 9 is from Guilloton's work on stream lines. Fig. 10 shows resistance curves for two models, the calculations being made by the source method. The forms were not experimental models but were actual ships, of high-speed form and not sym- metrical fore and aft. The models were divided into ten compartments and the strengths and positions of the sources determined directly from the plans of the model, the chief point of the work being to show that the calculations can be carried out in such cases. Finally, I reproduce in Fig. 11a diagram from Lunde's recent paper in which he examined the effect of placing sources and sinks off the longi- tudinal vertical section. Here the model was of destroyer type, but it is unnecessary to enter into details of the comparison except to note that some improvement was obtained by the space distribu- tion of the sources. I 1 >- r- , , 1 â From Approximation /; Model B^^^^^\ / / / t / ^^^^ ^ 1 â¢^\ ^^^ / ^â "Mode 1^^^ V. / / ^^^. y -. K.^ 035 Q50 Fig. 10 Wave a+Surface. Model () for -~== de ''^9'- Tangen+s -râ+o the Streamlines in Dotted Lines,ApproximatG Traces of some Streamlines Fig. 9 In some cases, and not only in those cases which have been reproduced here, one may sus- pect that the agreement with experimental re- sults is too good; or perhaps one should say rather that the agreement may be deceptive when pushed too far in view of certain considerations which have been neglected. There are, for in- stance, the effects of trim and sinkage at higher speeds, of which it is possible to make a rough es- timate; but, specially, there is the question of the effects of viscosity. We talk of comparing calculated wave resist- ance with experiment, but there is no such thing as an exper
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