G.P. 4,000-lb., Mks I and II (Service)

Fuzing

Color markings

Tail No.

Over-all length

Body length

Body diameter

Wall thickness

Tail length

Total weight

Charge/weight ratio

Body Construction:

Mk II – The body consists of a hollow steel casting open at each end, with six strengthening beams welded inside the nose end. The nose bush is screwed and welded into the nose, and a male base plate is screwed into the base. Exploder containers are threaded into the nose bush and the base plate, and are secured in place by locking screws. The rear end of the body is shaped to receive the tail assembly. The rear face of the body has two sets of four threaded holes for the wing bolts of the tail assembly, or the transit base.

Mk I – Similar to the Mk II, with the exception of two side fuze pocktes near the rear end of body, afforded by two adapters welded into the body and fitted with exploder containers which extend inward at a 45° angle to the axis of the bomb.

Tail Construction: The tail assembly consists of a cylindrical strut supported by four fins from the tail cone, and an arming mechanism for the tail psitol. The forward end of the arming spindle has a fork which engages another fork of the tail pistol. The rear end is fitted with a four-bladed arming vane. The arming vanes protrude beyond the cylindri-cal strut.

Suspension: The bomb body has three sets of tapped holes for the securing screws of a central suspension lug, and the fore and the aft hoisting brackets. The suspension lug is secured by four bolts at the center of gravity.

Explosive Components

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

Exploders – TNT and C.E.

Filling – 1,070 lb. Amatol 60/40, or 1,018 lb. of Amatex 51/40/9. The filling is sealed nose and tail with an approved composition.

Remarks: The Ant-Disturbance Fuze No. 845, formerly incorporated in the nose when the Tail Pistol No. 37 was used, is now obsolete.

The tail fins are usually painted red when a time pistol is used.

Figure 14 – G.P. 4,000-lb. Bomb Mk II