The technique of generalized harmonic analysis is employed to evaluate the trajectory responses of a hydro dynamically unstable slender missile moving vertically towards the free surface of a sea with waves. The free surface of the sea is represented by a Gaussian random function. The wave spectrum is com¬posed of the sum of the spectrum of a stormy sea (waves generated by a local storm) and the spectrum of a swell (waves generated by a distant storm). The Neumann-Pier son spectrum is employed for the stormy sea and a line spectrum is assumed for the swell. The missile considered is a body of revolution without fins and its forward speed is taken as constant. General expressions for the mean squares and the correlation coefficients of the trajectory response components are presented in forms which are suitable for numerical evaluation.
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