DESCRIPTION. This rocket consists of a large, bomb-shaped head, filled with an incen-diary mixture and burster ignition tube, and a motor body to which the head is threaded. The head has been raised ridges fore and aft to provide bearing surfaces, and near the nose is a filling plug. An adapter is threaded into the burster container, the base of the adapter containing a booster charge. The burster container two sets of one solid and one ring penthrite pellet. Between the sets of pellets is located a magnesium filled igniti-on charge container, through the center of which passes a burster stick of penthrite.

The motor contains a single propellant grain with one central perforation and eight smal-ler perforations arranged at equal intervals around the central one. Eight longitudinal grooves are formed along the exterior of the grain. In each groove is fitted a tubular cel-luloid inhibitor. Through the large central perforation is passed a length of quickmatch in a celluloid tube. This serves to connect the head igniter with a primary ignition charge located in a cloth bag at the after end of the propellant grain. The primary ignition char-ge and the propellant grain are supported by a metal grid attached to the venturi as-sembly. The venturi assembly, drilled to form 26 jets at a 16° angle, is threaded to screw into the after end of the motor body. A threaded hole in the base of the venturi assemb-ly accommodates the electric igniter. (See fig. 218.)

3. Although recovered only with an incendiary filling, it is reported that this round may also contain a chemical charge.

Figure 218 – 32-cm Incendiary Rocket