(Fig. 21)

The bomb is fired from the 3.7 cm Pak (anti-tank gun) by inserting the rod at the tail of the bomb in the muzzle of the gun and using a separate Q.F. cartridge.

The streamlined body of the bomb has a dome shaped impact cap carrying a nose fuze and is fitted with a tail unit consisting of a steel rod surrounding by a perforated steel sleeve carrying three pairs of vanes. The overall length of the fuzed bomb is 29.1 inches and weight, filled and fuzed, 19 lb. The exterior, except the rod, is painted deep olive green and stencilled in black. The stencilling includes the H.E. numeral "95" indicating the filling to be cyclonite/T.N.T. 60/40.

Fuze A.Z. 5075.

Bomb with tail unit.

Two small gaines, kl.Zdlg. C/34 Np.

Base fuze Bd.Z. 5130.

Cartridge case model 6331 St.

Propellant charge of Ngl.R.P. – 9.5 – (188 x 2.5/0.9).

Primer Percussion C/13 n.A. St.

Fuze A.Z. 5075 and Bd.Z. 5130 and the gaine kl.Zdlg. C/34 Np are described under sepa-rate heading in this Pamphlet. Primer C/13 n.A. St. is described in Pamphlet No. 7.

The estimated performance against homogeneous armour is about 5 inches (127 mm) at normal, and 3 ½/4 inches (89 - 102 mm) at 30 degrees.

The steel cup-shaped streamlined body has a thin wall and a flat base with a hole in the centre. Welded to the base is a steel ring carrying a fuze socket which fits into the hole in the base and protrudes below the ring. The socket is screwthreaded internally near the base for the insertion of the base fuze and is also screwthreaded externally for the assembly of the tail unit. The bursting charge, consisting of approximately 5 lb. 5 oz. of cyclonite/T.N.T. 60/40, is contained in a waxed carton and comprises two pellets. The pellets are shaped to fit closely in the body and to receive the cavity liner for the "hol-low". The liner is of 2 mm mild steel and is coned at approximately 40 degrees toward the base which is well rounded. A short metal flash tube, fixed in a hole at the base of the liner, leads to a cavity containing a gaine in the base of the lower pellet of the bursting charge. The liner has a small external flange at the top. The usual black bituminous com-position secures the paper carton of the bursting charge to the body and the whole is retained by a thin steel collar which is rolled into the body near the top and has an inter-nal rim overlapping a number of plastic washers assembled on the flange of the liner.

The steel dome shaped impact cap is cannelure near its base where it is supported by the collar to which it is attached by spot welding. A fuze socket is welded in a hole at the top of the cap for the insertion of the nose fuze.

The gaines are inserted through the socket for the base fuze. The upper gaine has its detonator towards the nose fuze and the lower, which is practically wholly contained in the socket, has its detonator towards the base fuze.

The hollow steel tail rod is approximately 15 inches long and 1.42 inches in diameter. The base end is closed and near this end there are circumferential grooves which probably serve to obstruct the passage of the propellant gases over the rod. The upper end of the rod is screwthreaded internally for assembly to the fuze socket at the base of the bomb body. A steel ring welded at the top of the rod carries a steel perforated sleeve of approximately 2.4 inches diameter which surrounds the rod and extends down to three inches form its base. The perforations are of about 0.75 inch diameter and extend throughout the length of the sleeve. Six vanes, formed in pairs, are attached near the base end of the sleeve.

The case is the normal 3.7 cm Pak model 6331 St. closed at the mouth by a cork disc. The propellant charge consists of 216 grams of Ngl.R.P. –9.5– (182 x 2.5/ 0.9). This is a double base propellant of nitroglycerine and nitrocellulose in tubular form. The dimensions of the tubular cords are:– lenght 7.4 inches, external dia-meter 0.098 inches, internal diameter 0.035 inches.

The igniter at the base of the charge contains 10 grams of Nz.Man.N.P. (1.5 x 1.5). This is the nitrocellulose powder in the form of small cylindrical grains normally used in igniters.

Fig. 21