Murthy 



m partial mass of ACV supported by air cushion. 



m partial mass of ACV supported by the buoyancy of the side 

 hulls. 



n unit normal vector. 



origin of co-ordinate system fixed in space. 



o origin of co-ordinate system translating in space with uni 

 form speed V in a straight line. 



origin of co-ordinate system fixed in the ACV. 



p variable of integration. 



p, p cushion pressure (excess over ambient). 

 c 



p (x,y) basic hull form of the air cushion, 

 o 



p surface pressure on IFS. 

 s 



p time -independent part of p 



s s 



R_. r wave resistance 

 W 



r distance between (x, y, z) and ( £,*?,£ )• 



r' position vector of element of mass of ACV or element of 

 area of IFS with o' as origin. 



r coupled displacement parameter = x + (z 1 + h ) 



klm klm G klm 



r , coupled displacement parameter = x, , + h ^ , , 



klm klm G klm 



S,S surfaces of integration. 



S instantaneous position of IFS during oscillations. 



S instantaneous position of the part of the plane z = contain- 

 ed within IFS. 



g 



o steady position of S . 



S' oscillating strip denoting the difference between S and S 



S starboard hull. 



S port hull. 



S , S starboard/port side of starboard hull. 



S , S starboard/port side of port hull. 



S , S longitudinal planes of S , S in their instantaneous posi- 



o o tion. 



250 



