Project Mohole Drilling Platform 

 Cjgj = diameter of hull times a drag coefficient 

 v,R = lateral and angular velocities of the vessel through the water 

 Lj = length of hull from vessel e.g. forward 

 Lj = length of hull from vessel e.g. aft. 

 Inertia Moment on Both Hulls 



where 



^inert ~ ^^^ded mass for steady velocity inertia moment 



u = longitudinal velocity of the vessel through the water 



v^ = lateral velocity of the "nose" of the vessel through the water; the 

 "nose" being a point a distance L3 upstream from the vessel e.g. 



Drag Force on One Fin 



Fy = -CdraglVflVf 



where 



Cjrag = area of fin times a drag coefficient 



Vf = lateral velocity of fin through the water. 

 Lift Force on One Fin 



Fy = -Ciift lulVf 



where 



^lift = area of fin times a lift coefficient 



U.Vf = components of velocity of fin through the water. 



Keulegan Force on One Hull 



This force due to wake formation drag is uniformly distributed over a part 

 of the length of the hull from Xj to Xj. 



(1) For u > 



X, = L. 



437 



