Figure 6-3.Common projectile types.
Large HC projectiles (fig. 6-3, view D) are provided
with an auxiliary booster to supplement the booster
charge in the nose of the main charge. With threads in
both the nose and base, HC projectiles may receive a
variety of fuzes or plugs to accomplish different tactical
purposes. An adapter ring (or rings) is provided on the
nose end of most HC projectiles to allow installation of
point detonating fuses (PDFs) or nose plug and auxiliary
detonating fuses (ADFs) with different size threads. An
adapter is removed for larger fuzes. HC projectiles are
normally shipped with a PDF installed in the nose. The
base fuzes that are shipped installed in the projectile may
not be removed except at an ammunition depot.
ILLUMINATING (ILLUM). Illuminating
projectiles (fig. 6-3, view E) are made with thin walls.
Each contains a time fuze, an ADF, a small black powder
expelling charge behind the ADF, an assembly
consisting of a pyrotechnic star or candle with a
parachute, and a lightly held base plug. The time fuze
serves to ignite the expelling charge. Explosion of the