Uniformly Valtd Soluttons of Laplace Equatton 
Figure 7 Outer description of the vortex sheet 
The starting shape of the vortex sheet is given, in this outer solution 
by the value of 06 “V/aZ when © = 0 or 271.The figure 7 gives a 
sketch of this departure ye } plane normal to the planform edge ( } ). 
The slope is found to be bP as in the two-dimensional case of an hy- 
drofoil without thickness. 
We conclude the analysis of the outer problem, with the figu- 
res 8 and 9 which show the singular behaviour of "lin the vicinity of 
a round leading edge (20) and a sharp trailing edge (34). 
THE SYMMETRIC PROBLEM 
LEADING EDGE TRAILING EDGE 
. ce eel 
Z Vs 
BYs 
wr W+ 
1 4 
NORMAL 
VELOCITY Ne 
Wi 
+ 
P4 
PRESSURE : hog WA \ | 108 p| 
¥ 
DISTRIBUTION 
P, 
Figure 8 
DSS 
