Research on flight stability of non rotating fin arrow shaft

To research the influence of the variable density fin arrow shaft warhead on flight stability, three different structures of non rotating fin arrow shaft warhead of the individual small caliber cluster arrow projectile is put forward and designed. The aerodynamic characteristics, static stability reserve and the change of the attack angle in the fin arrow shaft warhead are calculated and analyzed through using the static stability reserve theory and the rigid body trajectory equations. The results show that the static stability reserve of the variable density steel-aluminum composite fin arrow shaft warhead is about 21% ∼ 27%, which is obviously higher than 13% ∼ 17% of the single density steel material. When the initial velocity is 280 m/s and range is 100 m, the attack angle of the fin arrow shaft warhead of variable density and single density are reduced from 5 degree to within 1 degree.It is indicated that dynamic stability is guaranteed; however, dynamic stability of the former is better than that of the latter according to the decay rate of the attack angle.