Fuzes: B-5 (a).

Over-all length: 10 1/4 inches.

Length of body: 4 1/4 inches.

Diameter of body: 1 9/16 inches.

Thickness of wall: 1/32 inch.

Material of wall: Steel.

Type of suspension: Carried in clusters of 30 or 76 in a container.

Suspension lug: None.

Color and markings: Body is black with yellow band around center. The tail extension and tail are grey.

Length of tail: 6 inches.

Width of tail: 1 3/4 inches.

Width of tail fins: 7/8 inch.

Dimensions of tail struts: Diameter, 1 3/4 inches; width, 1 1/2 inches; thickness, 1/16 inch.

Material of tail: Aluminum.

Type of filling: TNT, 60 percent; RDX, 40 percent.

Weight of filling: 4 ounces.

Total weight of bomb: 11 ounces.

Charge/weight ratio: 37 percent.

Construction of body: The cylindrical steel body is crimped around the nose-piece and screwed into the forward end of the tail extension. An inner cone is found at the forward end of the body which gives a "Monroe effect" on exploding. The tail cone which houses the fuze is screwed into the after end of the tail extension. The booster assembly is contained in the tail extension.

Construction of tail: Three aluminum tail fins are attached to the tail cone by screws. They are braced by a single hexagonal strut and by a hexagonal end plate. (See modifed bomb).

Remarks: Modifed bomb: A container full of modifed type 2 40-mm bombs has been re-covered. These bombs are filled with Japanese Army Mark 2 explosive (TANOYAKU - 50 percent TNT - 50 percent RDX.) A 5/16-inch layer of pure cyclonite poured in on top fills up the bomb body.

Evidently in an effort to reduce UXB's the arming spindle of recent bombs was lengthened about 1/8 of an inch. This increase allows the cup-shaped vanes to protrude further into the wind stream.

The end plate on the modified bombs is omitted. A 3/16-inch strut at the extreme end of the fins is subsituted. A golden lacquered, thin, tinned steel is substituted for the older type aluminum tail fins.

Captured documents describe the use of this bomb in air bombing.

Figure 25 - Type 2 1/3-kg. Cluster Bomb.