Davis and Oates 



f = wave frequency (cycles/sec) 

 f ' = frequency of encounter (cycles/sec) 



g = acceleration due to gravity (ft/sec 2) 



h = immersion depth (ft) 



I = integral operator 

 l(]co) = frequency response of integrator 

 I^^ = rolling inertia (slugs, ft^) 

 lyy = pitching inertia (slugs, ft^) 

 l^^ = yawing inertia (slugs, ft 2) 

 l^^ = product of inertia (slugs, ft 2) 

 i^^ = normalized moment of inertia (l^-^/p^i) 

 i = normalized moment of inertia (ly/pS^) 

 i^^ = normalized moment of inertia (l^^/pS^) 

 ^zx = normalized product of inertia (l^^pS/) 



k = fractional increment of thrust horsepower 

 Kp = induced drag curve slope dCi, /da^ 



i 1 



L = rolling moment (Ib-ft) 



M = pitching moment (lb- ft) 



m = mass = (W/g) (slugs) 



N = yawing moment (Ib-ft) 



= origin 



P = rate of rotation about x axis (rads/sec) 



p = rolling velocity (rads/sec) 



Q = rate of rotation about y axis (rads/sec) 



q = pitching velocity (rads/sec) 



648 



