H.C. 4,000-lb., Mk I (Obsolescent)

Fuzing

Color markings

Tail No.

Over-all length

Body length

Body diameter

Wall thickness

Tail length

Tail width

Total weight

Charge/weight ratio

Body Construction: The body is a cylindrical shell which has a hollow, conical nose piece welded to it, parallel sides, and a closing plate bolted to an angle ring. The angle ring is welded in position a short distance inside the after end. The shell is strengthened by a T-section beam welded to its inner surface. Steel blocks, consituting pads for sus-pension lug and hoisting brackets, are welded in the angle of the beam. The central tube is fitted over, and cemented to, the stem of the exploder container, extending almost to the closing plate. Two exploder containers are fitted near the rear of bomb at 45° angles to the strengthening beam.

Tail Construction: The tail is a cylinder of light-gauge plate, closed at rear by a dia-phragm plate which is welded in position. Tail securing screws thread into corresponding holes near the rear edge of the body shell. The forward portion of the cylinder has saw-cuts between adjacent screw clearance holes, so that the tail can be sprung into the rear of the bomb body.

Suspension: A single suspension lug at the center of gravity is bolted to the body and internal strengthening beam.

Explosive Components

Detonator – (See Part 2, chap. 4, Detonators.)

Exploders – Exploder containers house one solid and two perforated C.E. pellets. The central tube is filled with 36 pellets of pressed TNT.

Filling – 2,882 lb. of Amatol 60/40.

Remarks: The bomb may be fitted with a nose attachment to retard it in flight, con-sisting of a light-gauge plate around the forward end of the shell, which projects beyond it around the conical nosepiece. Side fuze pockets are usually not used, but might con-tain a Time Pistol No. 47.

Figure 20 – H.C. 4,000-lb. Bomb Mk I