42 

















(2,4,6) 

 (2,3,4) \ 



v(3,4,6) 



r(4,6,8) 



^ 



^tvo 















^'^'C-rrt 



^^^^--^ 



=:^^ 



'P^ 









iz^:^ 







3~J 









\ 



(6,8,10) 



1 

 (8,10,12) 











0.4 

















{6,8,10)s, 



^ 



^ 



■(8,10,12) 









^.^-;;::::^ 



^^^"^^ 



:::^^ 





^^^::::\ 



^\^ 



s\(4,6,8) 





_^ 





^^ 



Sr:^ 





:^-^ 



(3,4,6) 



(2.4,6)- 



^ 



^. 



0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 



Figure l8 - Polynomials (Hj^ .n^ ,ng;0.1 ;0) and (n^,n2,n3;0;l ) 



Figure 19 - Examples of Lines 



^ = 0.60, t = 1 



An example has been given of how to find an economical lower limit 

 of prlsmatics from resistance considerations (page 39)- Still more important 

 is the problem of finding a corresponding upper limit for a given Proude num- 

 ber. Discussing the family (4,6,8) the result was obtained that for P = 0.25, 

 ^ = 0.68 is a reasonable value which cannot be exceeded without loss in effic- 

 iency (Figures 21 and 28). To check the deductions the curve (4,6,8; 0.68;2) 

 was used as sectional-area curve of the forebody in a model; the results of 



