McClure and Hove 



X« - Xi 



U or -L4 , 



whichever is algebraically greater. 

 (2) For U < 



X, = L 



X, = X, - I — U or L, , 



I V I 



whichever is algebraically less. 



Fy = -q |V| V(Xi-X2) 



where 



C^ = diameter of hull times a drag coefficient 



u = longitudinal velocity of hull through the water 



V = lateral velocity of vessel through the water 



Xj = coordinate of forward end of force 



X2 = coordinate of after end of force. 



AERODYNAMIC FORCES 



The forces that the wind exerts on the vessel are given by the formulas 

 below. 



F^ = 1/2 p\Yj\ (-CqSU+CcSV) 

 Fy = 1/2 p\\j\ (-CdSV-CcSU) 

 M^ - 1/2 pC^ SWj^ 



where 



C^,S = 300,000 sin [2(a- 5°)] 



and 



F^ = longitudinal force, positive forward 



Fy = lateral force, positive to port 



438 



