Johnson and Hsieh 



The results from such calculations together with curves like those in Figs. 

 8 and 10 would give the inception cavitation number of the body for a certain 

 body-tunnel combination (with reservation for the assumptions made in the 

 calculations). 



In connection with the analysis for the ITTC comparative head form tests 

 which I mentioned in connection with Mr. Bernd's paper, we calculated the 

 maximum bubble diameter for complete resorption for some of the participating 

 tunnels using Mr. Silverleaf 's equations. From these results, which are shown 

 in Fig. Dl, it appears that for most of the tunnels the value of the largest diam- 

 eter for complete resorption falls below the lowest Rg value (0.002 inch) given 

 by the authors, indicating that no serious scale effect can be expected in these 

 tunnels if reasonable body diameters are used. For the resorber tunnels the 

 values of this diameter is appreciably larger. Thus large models have to be 

 used in these tunnels if scale effects should be avoided. 



Cx/a 



2. C^O.ej. V = 7.5 mis 

 0.6, 0.62, II mis 



ff. 0002" 



Fig. Dl 



Largest bubble diameter for complete resorption 

 for different cavitation tunnels 



180 



