Stability measurement and free flight motion of projectiles with different boattail geometries

Tests on 7.5 cm projectiles with three different locations of the rotating bands were carried out. Stability measurements at four different velocities were performed as well as dispersion measurements for long-range firing at two velocities. The location of the rotating band affects neither the aeroballistic values nor the range/dispersion to any appreciable extent, except when firing at subsonic velocity, where the dynamic moment coefficients and the dynamic stability factor change considerably. At projectile velocities well above M=1.0 a change of the position of the rotating band within the tested interval of 0.07 caliber to 0.87 caliber in front of the conical boattail does not affect the aeroballistic behavior of the projectile to any appreciable extent.