+ Plot Plate Ref. 5 

































) 





X 











X Ship DD828 



Curve Based on Data from Ref. 7 



















-^ 



"^ 



X| 



Lj 



Ji- 

















— 



- 



+ 





J 



- 



r^^^' 



"++?" 

























































































10^ 10* 



Reynolds Number, R 



Figure 7 — Variation of Velocity Profiles Exponent with Reynolds Number 



10' 



10° 



Reynolds Number, Rjj 

 Figure 8 — Variation of C(n) with Reynolds Number 



The use of Equation [6] (or similar relationship) for approximating the growth of the 

 boundary layer on a ship is often necessary because of the paucity of full-scale measurements. 

 Strictly speaking, Equation [6] is applicable to only the two-dimensional turbulent flow over a 

 smooth flat plate in th6 absence of a pressure gradient. However, much of the hull surface is 

 flat, or relatively so; and in many of these regions the longitudinal pressure gradient is small. 

 In such cases the use of Equation [6] will give a more realistic estimate of S than will 

 Equation [5]. Values of n and C(n) to be used in Equation [6] are given in Figures 7 and 8, 

 respectively. 



12 



