Hydrofoil Motions in a Random Seaway 



q = dynamic pressure = 1/2 pV^ (Ib/sq ft) 



R = rate of rotation about z axis (rads/sec) 



r = yawing velocity (rads/sec) 



s = foil immersed area (sq ft) 

 s^ = reference area (sq ft) 



s = semi- span = (b/2) (ft) 



t = time (sec) 

 t* = b/2V = s/v = ratio of ref. distance to ref. velocity 



t = t/t* = normalized time 



U = velocity along x axis (ft/sec) 

 u^ = steady- state or reference velocity (ft/sec) 



u = perturbation in velocity along x axis (ft/sec) 

 u^ = horizontal component of wave orbital velocity (ft/sec) 

 u(t,x) = horizontal component of wave orbital velocity (ft/sec) 



V = free stream velocity (ft/sec) 

 v^ = reference velocity (ft/sec) 



V = velocity along y axis (ft/sec) 



v^ = horizontal component of wave orbital velocity (ft/sec) 

 W = weight (lb) 



w = velocity along z axis (ft/sec) 

 w^ = vertical component of wave orbital velocity (ft/sec) 

 w( t , x) = vertical component of wave orbital velocity (ft/sec) 

 X = longitudinal forces (along x axis) (lb) 

 X = horizontal distance in sea coordinates (random seaway) 

 X = longitudinal axis 



V = sideforce (along y axis) (lb) 



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