British Bomb, 400 lb IB, Mk 1




The bomb body consists of a thin sheet-steel cylinder with a tail plate welded at one end and a nose at the other. The nose is recessed to accommodate a cast-iron weight, which is secured in position with bolts.

Three perforated baffles are welded internally to the bomb case to reduce surging of the filling while the bomb is suspended aboard the aircraft. An internally threaded adapter in the center of the tail plate serves as a charging hole and also for the fitting of the exploder container. A cowl welded to the tail plate has six equi-spaced springs riveted inside it. These springs form an attachment for the six fasteners which secure the tail unit to the bomb. These fasteners consist of a stud and a leaf spring. The studs have an external screw-driver slot and an internal cam slot. The cam slot engages the spring attached to the cowl.

The Tail No. 79 Mk I consists of a cylindrical strut attached to the tail cone by means of three tail fins. The arming fork has only one prong, which engages the T-bar of the Pistol No. 60.

This bomb is equipped for suspension in either British or American aircraft, having on one side a single suspension lug, and dual lugs 180° removed.

This bomb is filled with a highly volatile, inflammable gel which is readily ignited by naked flame, or by contact with water. The filling may smell of gasoline, or carbolic acid. Rubber boots, gloves, and eye-shields are recommended for all personnel engaged in disposal operations on this bomb. If the filling comes into contact with the skin, all traces should be swabbed off with a rag soaked in gasoline or paraffin, and the effected area should then be washed with water and the patient treated for alkali burns. Contaminated equipment should be cleaned with gasoline or paraffin, and then washed with water.

See Also

British Bombs - Construction

British Bombs - Designation and Classification

British Bombs - Fillings


OP 1665, British Explosive Ordnance (1946)