ALLIED BOMBS AND FUZES

DESIGNATION

PRINCIPAL MARKING

(A) D.A. No. 14 Mark I

(A) D.A. No. 13

(B) D.A. No. 15 Mark I

Mark I

(C) D.A. No. 15 Mark II

(B) D.A. No. 15

CLASSIFICATION

Mechanical Nose Impact

Mark I

TYPE OF MISSILE

(A) - (B) New Bombs

(C) D.A. No. 15

(C) - H.E. Aircraft Bombs

Mark II

MARKINGS AND

BOMBS USED IN:

SUBSIDIARY

(A) - (B) New Bombs

MARKINGS:

(C) - H.E. Aircraft Bombs

Then the bomb is released from the plane, the pressure plate stop (D) is retained on the carrier by the fuzing wire. The arming vanes are then free to rotate, causing the striker to be screwed inwards. On impact, the pressure plate is driven forward, shearing the shear wire (M) and carrying the striker to the detonator.

Data

(A)

(B)

(C)

1

COLOR

Brass

Brass

Brass

2

OVERALL LENGTH
(less booster)

3.8"

4.3"

4.16"

3

OVERALL WIDTH

Body 1.9"
Vanes 4.6"

Body 1.9"
Vanes 4.6"

Body 1.9"
Vanes 3.0"

4

MATERIAL OF CONSTRUCTION

Arming vanes - steel. Brass Body and arming vane spindle.

Body brass, vanes Aluminum alloy.

5

DESCRIPTION

These fuzes consist of a brass body with admiralty taper nose threads on the D.A. No. 14 Mark I and standard pa- rallel threads on the D.A. No. 15 Mark I and D.A. No. 15 Mark II. The lower portion is threaded to screw into an ex- ploder. Das escape holes (H) are drilled above the lower threads into the interior of the body. A gland (G) screws into the center of the body. At the top of the body there are eight semi-circular notches cut into the upper periphery of it. The pressure plate (J) is permanently attached to the stem (F) which is located in the body by an eccentric shearing wire (M), 1/16 inch in diameter, passing through the stem (F) and the gland (G). The stem is bored centrally and threaded to take the arming vane spindle (B). Two steel vanes are permanently attached to the brass arming vane spindle, which terminates in the striker (O). A pres-sure plate stop (D) is interposed between the body any the pressure plate and is secured by a safety pin (E) for tran-sit. A small lug (I) on the outer end engages in a serration in the body. The arming vane stop (K) is attached to the outer end of the pressure plate stop.

Safety Devices: - A U-shaped spring rivetted to the pres- sure plate stop fits around the pressure plate spindle. An eccentric shearing wire (M) passes through stem (F) and gland (G). A pressure plate stop pin (L) prevents the striker spindle from moving forward or rotating. The arming vane stop (K) prevents the arming vanes from rotating. If the red ring (C) is visible, the fuze is safe.

6

POSITION AND METHOD OF FIXING IN BOMB

Screwed into the nose of bomb by spanner wrench.

7

FUZES LIKELY TO BE FOUND WITH

8

COMPONENTS OF EXPLOSIVE TRAIN

Detonator screwed onto lower part of the fuze body. Entire fuze assembly fits into exploder tube.

9

ARMING TIME

10

Remarks

1) Fuzes D.A. No. 14 Mark I and D.A. No. 15 Mark II are not at present included in the fuzing diagrams, but the design is retained in the service for possible in new types of bombs.

2) Fuze D.A. No. 15 Mark II is similar to Pistol, Bomb, D.A. No. 15 Mark I, and dif-fers principally in the following respects:

a. The arming vanes are of cast aluminum alloy, and are of a different shape.

b. A split ring is used on the safety pin instead of the loop formely used.