Over-all Length: 72 in.

Filling: Main filling – Dinitro benzine, 48%; RDX 15%; ammonium nitrate, 37%; biscuit fil-ling – ammonium nitrate; 51%; calcium nitrate, 31%; RDX, 16%.

CONSTRUCTION. The parallel sides body of the SB 1000 is made of steel plate and is roughly elliptictal is end section. It is found by two halves which are welded together ex- ternally. The bomb body is strengthened by a longitudinal bulk-head and two perforated diaphragms all welded into position. The base plate is welded into the body 2 1/2 inches from the end. The recess so formed is used to house the parachute container. The fuze pocket is welded into a slot in the longitudinal bulkhead. Nose plate is welded into posi-tion and has in it filling holes. The-re is a nose extension in the center of the nose plate which houses the impact switch 55 A/M fuze. The fuze pocket is connected to the im-pact switch by two wires which are housed in a metal tube. The parachute container, a thin metal box, is positioned between two ribs riveted to the base plate. It is secured to the base of the bomb by bolts. Inside the outer box an inner container is welded to the base of the outer box. Four extension springs are secured to the base of the inner con-tainer and are also attached to a plywood platform which is the base for the plywood, the platform depressed, compressing the spring then held in place by canvas flaps secu-red over the top. The under flap carries a loop of cord which is threaded through eyelets of the other three flaps, a quick release pin is passed through the loop, thus retaining assembly against action of spring. (See fig. 21.)

OPERATION. On release from aircraft the quick release pin is withdrawn from the loop by a  time parachute release which can be set for delays of 2, 3,4, 5, or 6 seconds. This device obtains its delay means of a spring and cog wheel.

The parachute is of coarse weave vegetable matter. Red, green, and blue parachutes have been found. There are 16 double parachute shroud lines.

SUSPENSION. Horizontal.

COLOR AND MARKINGS. The bomb casing is painted feld gray which the following mark-ings stenciled in black along the body.

SB 1000/410–52A+, 52A.

It has been assumed that the figure "410" refers to the type of aircraft by which the bomb is carried. ME410.

Figure 21 – SB 1000-kg Parachute Bomb