Improved projectile performance can be achieved in several different ways which to a certain extent can be combined in one and the same projectile. At present work is proceeding along three different lines, of which the first involves attempting to produce a low-resistance projectile where the air resistance is reduced to a minimum. This work has resulted in longer and slimmer projectiles. The second line involves equipping special projectiles with their own source of power in the form of a built-in rocket motor, so-called "reatiles" or Rocket Assisted Projectile (RAP). With regard to the third line, the work has been concentrated around reducing the base resistance of the projectile, caused by the stream of air round the projectile generating a lower pressure immediately behind the projectile base than in the surrounding air.
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