ALLIED BOMBS AND FUZES

DESIGNATION:

TYPE OF MISSILE:

CLASSIFICATION:

MARKINGS:

DATA

M-100

M-101

M-102

1

COLOR

Unpainted

Unpainted

Unpainted

2

OVERALL LENGTH
(less booster)

10 inches.

12 inches.

16 inches.

3

OVERALL WIDTH

4

Body.

2.3"

2.3"

2.3"

5

Vanes.

5.0"

5.0"

5.0"

6

MATERIAL OF CONSTRUCTION

The fuze are made of cadmium plated steel with brass stri- ker block, brass primer-detonator holder and several small brass parts.

7

DIFFERENCES

These fuzes are identical except for the variations in the length of arming stem cases.

8

PARTS

1

10

2

11

3

12

13

4

14

5

15

6

16

7

8

9

7

OPERATION

When the bomb is dropped, the arming wire is withdrawn, freeing the vanes (2) which then rotate. This caused the idler gear to walk around the movable (top) gear and the stationary gear (bottom). Due to the fact that the move- able gear has 30 teeth and the stationary gear 29 teeth, the moveable gear must begin rotating one tooth in relea- tion to the stationary gear per rotation of the vanes. The stationary gear is held fixed by the carrier stop (5). A col- lar, integral with the moveable gear, is fixed to the arming stem (7) by a cotter pin. Therefore, the arming stem will also rotate in a clockwise direction. Since the arming stem is lefthand threaded, it will unscrew from the striker block (12) and the fuze body (9). After 720 revolutions of the vanes, the arming stem will be unscrewed from the striker block (12) and after approximately 1200 revolutions, it will be unscrewed from the body. At this point, the arming stem, vanes, and gear assembly will fly off. On impact, the striker which is held up now only by a creep spring (15), will be driven into the primer-detonator by inertia.

8

POSITION & METHOD OF FIXING IN BOMB

Screwed into the base plate of the bomb, hand tight.

9

FUZES LIKELY TO BE FOUND WITH

Normally used with M-103, AN-M-103.

10

COMPONENTS OF EXPLOSIVE TRAINS

Primer, delay, relay and detonator contained in brass hous- ing in base of fuze.

11

ARMING AND FUNCTIONING TIME

These fuzes are armed after 720 revolutions of the vanes. Have .10 second delay.

12

INDICATION OF ARMING

Fuze is armed when gear carrier stop protrudes less than one inch below the vane cup.

13

PRE-ARMING FOR DIVE BOMBING

Either (a) rotate the vanes 350 revolutions or (b) remove arming stem after inserting safety pin through striker block, drill hole in arming stem .4 inch below present hole and in- sert cotter in this hole. This method safer than (a) above. State on tag on fuze indicates - Pre-armed. Some of these are pre-armed at the factory.

AN-M-100 A1
AN-M-101 A1
AN-M-102 A1

Bombs used in:
Same as M-100 series except an M-102A1 can be used in 4000 lb. AN-M-56 bomb.

Same as M-100, M-101, M-102 except:

This series incorporates the M-14 Primer-detonator which has four functio- ning times (non-delay, .025 second, .01 second, .10 second) rather than a fixed delay of .10 seconds as the M-100 series. The delay is stenciled on the base of the M-14 primer-detonator. In addition the base of the non delay is painted white or unpainted, the base of the .01 se-cond delay is painted one-eighth black, and the base of the .10 second is painted all black. The base of the .025 sec. is painted ¼ black.

Prearming this series:

Rotate the Vanes 350 revolutions; or
Remove arming stem, after inserting safety pin through the striker block. Drill hole in arming stem .4 inch below present hole and insert cotter in this hole. This method is safer than above. Some are pre-armed this way at the factory. All A1 fuzes are pre-armed at the factory. State on tag on fuze of it is pre-armed.

AN-M-100 A2
AN-M-101 A2
AN-M-102 A2

Bombs used in:
This series same as M-100 series with the following exceptions: Can be used in 4000 lb. AN-M-56 bomb.

Same as AN-M-100-A1 series except:

1.

Reduced number of threads from 24 single to 16 double threads which re-duce number of revolutions necessary to arm, from 720 to 150-170.

2.

Reduced number of vanes from eight to four.

3.

Changed shape of vanes, making them narrower and increasing their pitch.

REMARKS:

Do not try to pre-arm this fuze. This fuze, as received in the field is suitable for horizontal, glide, or dive bombing but not for skip bombing.

SAFETY PRECAUTIONS WITH THESE SERIES

1.

Do not take gear assembly down in the field.

2.

Insert safety pin in striker before removing stem.

3.

Remove primer detonator only when changing delay. This applies only to A1 and A2 series. The primer-detonator cannot be changed on the M-100 series.

4.

Do not try to unarm fuze by rotating vanes in reserve direction.