Fuzes: (With magazine) A-3 (a), or A-3 (b).

Over-all length: 40 inches.

Length of body: 21 3/4 inches.

Diameter of body: 7 7/8 inches.

Thickness of wall: 1/4 inch.

Material of wall: Steel.

Type of suspension: Horizontal.

Suspension lug: Normal Navy suspension lug.

Color and markings: Gray over all with a red nose band and red tail struts. New type co-lor markings will be found.

Length of tail: 18 3/16 inches.

Width of tail: 10 5/8 inches.

Material of tail: Sheet steel.

Dimensions of tail struts: Length, 7 7/8 inches; width, 1 3/8 inches; thickness, 3/32 inch.

Type of filling: Four thermite-filled electron fire pots are contained within the bomb. The nose and tail fire pots are cylindrical, while the two in the body are semicircular. A cen-tral channel filled with quick match runs the length of the bomb. A blackpowder charge is located in the circular recess in the nose piece.

Weight of filling: 81 pounds.

Total weight of bomb: 156 pounds.

Charge/weight ratio: 51 percent.

Construction of body: A cast-steel nose is riveted with 2 rows of 10 rivets each to a tubular-steel body. The tail cone is held by 1 row of 24 rivets to a collar which is held in the base of the bomb by 2 rows of screws (14 per row).

Construction of tail: Four steel fins are welded to the tail cone and are braced by a single set of box-type struts.

Operation: On impact the magazine in the nose fuze fires the black powder and the ig-niting charge. The black powder ejects the fire pots from the bomb case. The igniting charge ignites the quick match which initiates combustion of the thermite.

Figure 56 - Type 98 No. 7 Mk 6 Bomb Model 1.