Abstract
This paper presents the effect on the manoeuvring characteristics of an axisymmetric underwater vehicle due to its body slenderness ratio and aft fins. The vehicle is a slender body of revolution with elliptical nose, tapered tail and cylindrical middle body. Five vehicle lengths with slenderness ratio from 10.8 to 14.4 with two sets of aft cruciform fins with different aspect ratios are employed for this study. The effect of manoeuvrability is evaluated by simulation of standard manoeuvres using 6 degrees-of-freedom (6DOF) equations of motion. The variation of normal force and pitch moment at oblique flows/pitch rates due to slenderness ratio and aft fin are evaluated by experimental and numerical methods. It is seen that the straight line stability in horizontal plane improves with slenderness ratio and aft fins size.
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