Filling: In earlist specimens, TNT. In all later specimens a naphtalene explosive mixture. This latter is a lower performance explosive, used perhaps for better fragmentations.

Total Weight: 49-52 kg.
Fuzing: 55.

CONSTRUCTION. The concrete walls in all these models are loaded with small fragments of scrap metal. (See fig. 46.) The explosive filling of the model A1 is surrounded by a thin steel metal container which acts as a former for the concrete. The fragmentation effect of this bomb was apparently unsatisfactory, owing to excessive weight of explosive cau-sing pulverization of the concrete. An attempt was made to improve it in Model C by re-ducing the weight of the explosive and increasing the thickness of concrete while still retaining the metal explosive container. A further modification along these lines was made in Model D, but it seems that the quantity of explosive had been reduced to too low a limit, and in Model E the weight of explosive is increased in amount to be the same Model C. The metal explosive container, however, has been dispensed with, and the con-crete has been precast on a gridded steel rod framework. The steel frame-work is welded to a cast steel plug at the nose and a cast steel ring at the tail. The tail are of sheet steel. Early models had the tail set in concrete. Later models have a detachable tail.

SUSPENSION. Vertical or horizontal suspension is used.

COLOR. Bright green over all.

Figure 46 – SBe 50-kg Concrete Bomb