Abstract
This paper presents a model for forward motion and tail slap dynamics by mathematic deduction. The MATLAB software is applied to model the above motion and the characteristics for a single slap in the water layer are analyzed, as well as several slaps in the cavitation. The duration time of single slap increases as the projectile speed decrease into a certain range and this may lead to collapse of the supercavitation and instability of the projectile moving forward. It turns out that the number of the tail slap and the reflection angle increase with the increasing of the projectile angular speed. What’s more, the differences between parameters of different slap points become smaller as the tail slap goes on under supercavitation condition.
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