FUZING

COLOR & MARKINGS

TAIL NO.

BURNING TIME

OVERALL LENGTH

BODY LENGTH

MAX. BODY DIAMETER

WALL THICKNESS

TAIL LENGTH

TAIL WIDTH

TOTAL WEIGHT

120 lbs.

CHARGE/WEIGHT RATIO

BODY CONSTRUCTION:

The bomb consists of a cylindrical body, to which the tail unit is secured, housing a metal container filled with a smoke composition, and a gunpowder ejection charge con-tained in nine celluloid capsules. The bomb body is a steel tube welded to a flattened nose-piece. The nose-piece is centrally tapped to receive the fuze and, during transit and storage, is sealed by a nose transit plug and leather washer. To the exterior of the bomb body is welded a suspension lug.

A steel flash plate, abutting the nose-piece within the bomb body, has secured to it a steel collar. A small centrally-located hole is drilled through the flash plate and is sea-led by a paper disc. The nine celluloid capsules, each filled with 1 oz. 1 drm. of gun-powder, are retained in the collar by a cardboard sleeve and felt and cardboard washers. The sleeve has six equi-spaced holes near its inner end.

The metal container, filled with approximately 50 lbs. of smoke composition (H.C.E.), is housed in the bomb body against the flash plate and has, at this end, a 3 in. diame-ter hole sealed with a celluloid disc. Between this disc and the smoke composition there are four strawboard washers, each with a 1½ in. diameter hole, the hole is so formed being sealed by two squares of primed fabric. The container is retained in position against the flash plate by a closing plate fitted into the rear end of the bomb body and secured by four metal tabs turned over.

The tail unit is secured to the bomb body by eight drive screws and consists of a tail cone to which a cylindrical vane is secured by four vane supports.

FUNCTIONING:

On impact of the bomb with the target, the magazine of the fuze explodes after a delay of not less then ¼ sec., during which period the bomb will have come to rest. The flash from the fuze magazine, passing through the hole in the flash plate and the celluloid disc, ignites the two primed cambric squares, which in turn ignite the smoke composition in the container.

Concurrently with the ignition of the smoke composition, the flash from the fuze ma-gazine also passes through the holes in the cardboard sleeve to initiate the gunpowder eejction charge contained in the nine celluloid capsules. The resulting explosion of the gunpowder ejects the tail, the closing plate, the container of burning smoke composi-tion, and the flash plate, clear of the crater formed by the bomb.

SUSPENSION:

Two bombs may be carried in a 250 lb. Small Bomb Container, or the bombs may be suspended individually by a single lug. The Mk II bombs may be fitted with twin lugs for suspension in American aircrafts.

EXPLOSIVE COMPONENTS:

REMARKS:

The smoke composition contained in these bombs is liable to spontaneous ignition should it become wet, particularly with sea water.

The Mk II bomb is similar to the Mk I in operation, the principal differences being a modified tail assembly and arrangement for twin suspension lugs for carrying in Ameri-can aircraft.