Hydrofoils Running Near a Free Surface 
with 
F, = | AV1- 7? K;-| d7 
x n 
1 
OK; 
F, = | 7? V1- 7? Sen? « 
0 oh 5 
185 
Together with the stabilizing moment a lateral force is effective, the magnitude of which is 
oP | ns a es 
dP, = 7 dA+ — db +| ae. 
e ob oh 
The general term for the lateral force is given by 
Py _ = pu, bc Chak Kp sin 6K, 
A,b,h 
> 
3) 
With the differentials 
dA 
I 
+! 
Q 
D 
and 
oP OK z 
c 1 Bis: : A| 4 2 
eA = 0u-- be C.K K sind a oe 
aA ae 2 ft) Loa’ P 0A aoe , h 7 
oP 7 
= | ; 1 é. ea! 
aE = 5 Pug be Ci aK Kp sin 5 MA =| 1-7* Ky 
A,byh, 2 g 7 
oP i ree 
1 4 = 
Pa = % Ug be Ce ee ke sin $ K, A 1 - 7? + 
dh |, cc ee oh 5 
A,;byho A 0 7 
the resulting change of lateral force is found to be 
dj. 
dn, 
(31) 
(32) 
(33a) 
(33b) 
(33c) 
