CONSTRUCTION. Bomb is made in five sections. The central section is 2 feet 4 3/4 in-ches long and remaining sections are 1 foot 10 1/4 inches long. Sections are cylindrical in shape and of sheet steel constrcution. (See fig. 48.)

Each section has ends closed by a circular steel plate in which six holes are drilled and six steel tubes welded into position. When the five sections are assembled, six tie rods are passed through the steel tubes and secured at the extreme ends of the bomb by a washer and two nuts.

A central exploder tube is formed in each section in the same manner as the connecting tubes. Twenty-four picric acid pellets are stowed in the exploder tube of the central section and 18 pellets in each of the other exploder tubes. Exploder tubes are closed at each end by a cardboard disc held in position by a threaded washer.

A circular felt pad is placed between each section when bomb is assembled.

Three filling holes are provided in each section.

The nose fairing consists of a truncated conical section to which is welded a convex section; an internally threaded collar is welded to the convex section. A steel tube 3 feet 1 1/4 inches long is screwed into this collar. Three similar collars at an angle of 120° to each other are positioned off center on the convex section. Three steel tubes 9 1/8 inches long are screwed into these collars. The truncated conical section of the nose fairing is recessed at eight points to accommodate bolts which secure fairing to bomb.

The end of the long and three small tubes are fitted with steel closing plugs.

A transverse fuze pocket is located in the central section. Fuze pocket appears to termi-nate at central exploder tube.

No fuze has been found with the bomb but the threaded holes in the steel plugs accept the nose which of the (55) A fuze. Also, there are slots in the truncated conical section of the nose that may be for electric cable leads. Locating ring attached to each bomb is of normaly type and not slotted type used with (55) A fuze.

Eight bolts which screw into the external plate of the after section appear to be for at-tachment of a tail unit, but no tail unit was found.

SUSPENSION. The central section is fitted with a suspension lug. Lug being capable of limited lateral rotation. Section is also recessed and threaded at sides for fitting of trunnions.

COLOR AND MARKINGS. Fawn colored over-all, section are marked I, II, III, IV, and V. SA 4000 is painted in large black letters on the body. The letter V plus serial number of bomb is also present. The three specimens examined were 2, 3, and 7.

Figure 48 – SA 4000-kg Bomb