Development of 90mm Shot (Armor Piercing). Fin-Stabilized Discarding Sabot for the Defeat of Armor

On the basis of the progress made to date in the development of the APFSDS shot, the following conclusions have been drawn 1 a new theory of penetration of armor by armor piercing shot has been established 2 four in. of rolled homogeneous armor plate at 55 deg. obliquity at 2000 yds., or 4 in. at 60 deg. obliquity au 1000 yds. can be defeated using the present M-36, 90 mm rifled gun. 3 five, or possibly 6 in. of rolled homogeneous armor plate at 60 deg. obliquity at 2000 yds. could be defeated with an improved 90 mm smooth bore gun system 4 smooth bore tank weapons will lead to improved interior, exterior and terminal ballistics for tank ammunition 5 from a stress point of view the fin stabilized shot can be launched at higher velocities than a spin stabilized shot 6 the probability of a first round hit is greater with a fin stabilized shot than with a spin stabilized shot.