Dagan 
s 2 yeh i . 2h 
Eo eS ae epCal a2 6 (eh eae 
jk oF Lire k, k, Fr’ 
el 
2 
+ 4h 
L(+ a) 
2 
s h/F 2 
= 4 1 f 
Ta (Ff Zeqt*)\reos ik 
2 
s -h/F ahi es 
fait =4e (-1+2e °) sin€. 
2 
Gt _ 2674h/F (24) 
II .3 - The Wave Resistance of n Sources. 
In the case of n sources (fig. 1) the streamfunction far 
downstream is obtained from the solution for two sources as a finite 
sum. If we write for n sources 
cos sin. 
(x — co) 
(oc 4 "OyR= vi cosx + v sinx 
v5 (x, 0)= cc cosx + S sinx + Sah (x + oo) (25) 
where yconst results from the last two terms of (23), then the wave 
resistance at second order (Salvesen, 1969) is given by 
2 3 (26) 
with 
1 cos cos sin sin 
eo) (27) 
1704 
