~~ a 
Sectional (two-dimensional) added mass 
Hydrodynamic force normal to baseline 
Wave elevation r= Ty COS (kx+wt) 
Wave amplitude 
Relative fluid velocity parallel to baseline 
Relative fluid velocity normal to baseline 
Speed-to-length ratio in knots/ft!/? 
Weight of craft 
Vertical component of wave orbital velocity 
Vertical component of wave orbital acceleration 
Fixed horizontal coordinate 
Vector of state variables 
Surge velocity 
Surge acceleration 
Surge displacement 
Fixed vertical coordinate 
Heave velocity 
Heave acceleration 
Heave displacement 
Deadrise angle 
Hull displacement W 
Body coordinate normal to baseline 
Wavelength 
Pitch angle 
Pitch angular velocity 
vi 
