Impact of Gravity for Stability of Super-vacuole Projectile

The paper researched the impact rule of gravity for movement stability in the water of super-vacuole? projectile.Based on two states of projectile whether the projectile produced the collision with vacuole wall,it constructed the mathematical model of projectile moving stability.The analysis shows that for projectile of the same weight and length,when the projectile center is near the front head or the quality density of projectile head is larger it is more propitious to the projectile moving stability.