THE APPROXIMATE CALCULATION OF WAVE RESISTANCE AT HIGH SPEED 57 
plan would be to take sections giving equal differences of sectional area, and 
this would lighten the numerical work to some extent. On the other hand, it 
would be possible to locate the sections so that the sources were for the most part 
in fixed positions relative to the length of the model, and such a scheme would 
have the great advantage of allowing of tabulation of the sine and cosine terms 
in advance. Obviously any scheme which permits tabulation and systematic 
procedure in the computation would not only give greater accuracy in the 
calculations but would make it possible to extend their range of application. 
As a general conclusion from the present work it may be said that, although 
the method needs further testing and systematizing, it indicates a possibility 
of calculating wave resistance from the plans of the model, at least for high 
speeds ; and that the results so obtained would agree fairly well with those 
that could be calculated from the usual integrals if the lines of the model were 
given by mathematical equations. If this should prove to be the case, it would 
be possible to have a greater variety of form in experimental models, so pro- 
viding more material for comparison between theory and experiment and 
giving ultimately a better basis for application of the calculations in practice. 
Fig. 1—see next page. 
G6 9% LWL. JO 
Fig. 2—Model A. 13:57’ x 1-28’ x 0-434’. 
Displt. 259°4 lb. M.S. coefft. 0°775. Prism. coefft. 0°711. 
Fig. 3—Model B. 13-57’ x 1-28’ x 0-455’. 
Displt. 259°4 lb. M.S. coefft. 0°802. Prism. coefft. 0°656. 
510 
