

2.2 



- 



1 1 1 1 1 I - 



Rg = 5(10)6 

 PARENT 



1 





2.0 



~ 



O 90 m ] 



D WO n \ STANDARD ROUGHNESS 



Q 600 /;i j PATTERN 



2S 800m 



— 





1.8 





/ 





1.6 



_ 







^7- 



X 



Ul 



O 



1.4 







/ 

 / 



//- 



z 









/ 



// "/ 



z 

 o 



1.2 







/ £ 



r / - 



1- 

 < 









/ V/ 



/ 



> 



1.0 



_ 





/ ?y 



/ - 



5 











? 





0.8 



_ 





_ 











/ p/;y 







0.6 



- 







- 





0.4 



- 







- 





0.2 





1 1 





1 



-0.3 



-0.1 



0.1 



LIFT COEFFICIENT C, 



0.2 



0.3 



0.4 



0.5 



Figure 23 - Cavitation Inception as a Function of Lift Coefficient 

 for Varying Roughness Grain Size — Standard Roughness Pattern 



presented in Figure 24 to show the relative increase in TVC inception speed relative 

 to the parent foil, over a range of C . The relationship between a and U is obtained 

 directly from the expression 



P - P 



ipu^ 



and for constant (P -P ) 



p \ 3 



1/2 



33 



