To study the motion characteristics of the cavitation bubbles and their effects on motion attitudes of missiles during the process of submarine-launched missiles out of water

a new research system for test of smallscale solid of revolution going out of water which can be available under laboratory conditions is designed. The system transforms the gravitational potential energy of the pendulum into projectile kinetic energy by means of pendulum mechanism and the piston mechanism to realize launching

and use high-speed camera system to observe experimental phenomena and analyze motion characteristics of cavitation bubbles of shoulder and tail as well as their effects on motion attitudes of missiles during water exceeding process of missiles

a distinct boundary shows on the fore part of cavitation bubble of shoulders

and air masses falloff the closed cavitation bubble on the tail during the process

and restoring moment forms due to differential pressure between the incident-flow surface and the back-flow surface of the shoulders cavitation bubble to adjust the motion of missile

and this research of the system provides a reference for water ballistic design of underwater launching of missile.