Fuzes: B-5 (b).

Over-all length: 17 1/2 inches.

Length of body: 8 1/2 inches.

Diameter of body: 1 3/4 inches.

Thickness of wall: 1/16 inch.

Material of wall: Steel.

Type of suspension: Carried in clusters of 40 in a container.

Suspension lug: None.

Color and markings: Body is a natural steel color. The tail assembly is aluminum colored.

Length of tail: 9 inches (includes fuze).

Width of tail: 1 3/4 inches.

Dimensions of tail struts: Length, 1 3/8 inches; diameter, 1 3/4 inches; thickness, 1/32 inch.

Material of tail: Light sheet tin.

Type of filling: Type 98 (TNT, 70 percent, HND, 30 percent). Tetryl booster.

Weight of filling: 11 ounces.

Total weight of bomb: 2 pounds 3 ounces (exclusive of nosepiece). Weight of tail as-sembly: 10 ounces; weight of body: 14 ounces.

Charge/weight ratio: 31 percent.

Construction of body: The body is constructed of tubular steel. An aluminum nose cap and hollow metal cone are crimped into the nose. The fuze and tail assembly are thread-ed into the base of the body.

Construction of tail: Four fins are soldered to the tail cone and braced at the after end by a circular strut. The tail cone is secured to the fuze body by four small screws.

The arming system consists of arming vanes at the after end of the tail connected to the inertia weight by a threaded reach rod which passes through the tail cone. A spring loaded safety detent which fits into the inertia weight is located on the side of the tail cone and is held in the safe position by an arming wire. A thin metal disk attached to the arming wire is placed on top of the arming vanes. It prevents the vanes from rotating and acts as a drogue to withdrawn the arming wire when the bomb is released.

Operation: When the bomb is released from the canister the pressure of the air on the drogue forces it from the bomb thereby withdrawing the arming wire. The safety detent spring ejects the safety detent. The vanes rotate and unscrew the reach rod from the inertia weight. The inertia weight and striker are then free to move forward on impact and hit the primer.

Figure 61 - 1-kg. Hollow-Charge Bomb.