|
|
|
ALLIED BOMBS AND FUZES |
| PART II - U.S. BOMB FUZES |
| A. ARMY FUZES |
|
FUZE DATA |
FILE NO.: 2111.B5 |
||
|
NATIONALY: U.S. Army. |
INFORMATION DATE: Sept. 1943 |
||
|
DESIGNATION: |
M-106, M-106 LONG |
TYPE OF MISSILE: |
G.P.H.E. Bombs |
|
M-106A1, M-106-A1, M-106A2 |
|
||
|
CLASSIFICATION: |
Mechanical Impact |
PRINICPAL MARKINGS: |
Tail Bomb fuze |
|
Tail Fuze (with Pyrotechnic delay) |
M-106 or M-106 Long. |
||
|
|
|
MARKINGS: |
|
Tail Bomb fuze M-106, Tail Bomb Fuze M-106 LONG (on top closing plug of fuze) Typical subsidary markings: P.A. 9-39, LOT 1234-5. |
|
BOMBS USED IN: |
|
All standard G.P.H.E. Bombs of the Mark and M Series M-106 LONG used in Mark Series 2000 lb. G.P.H.E. |
|
|
DATA |
M-106 and M-106 Long |
|
1 |
COLOR |
The fuzes are unpainted cadmium-plated steel. |
|
2 |
OVERALL LENGTH |
M-106 (regular) 9.4 inches |
|
3 |
OVERALL WIDTH |
1.6 inches |
|
4 |
MATERIAL OF CONSTRUCTION |
Cadmium-plated steel except percussion cap housing which is brass. |
|
5 |
PARTS |
|
1 |
Arming pin spring |
6 |
Primer | |
|
2 |
Arming pin |
7 |
Safety fuze or delay train | |
|
3 |
Striker block |
8 |
Upper detonator | |
|
4 |
Creep spring |
9 |
Lower detonator | |
|
5 |
Striker |
|
6 |
DESCRIPTION |
|
|
These fuzes consists of a hollow steel striker block holder closed at the upper end by a threaded plug. This holder contains the striker block which is of steel with two grooves for air-pressure release. Both the holder and the striker block have a 1/2 inch hole drilled through near the top to receive the spring-loaded arming pin. A brass fitting housing the percussion primer is threaded into the base of the hol-der. Between the striker block and percussion cap is a steel creep spring. The brass fitting is externally threaded to receive a steel sleeve into which is placed a length of safety fuze with aluminum collars at top and bottom to to correctly po-sition the fuze. The sleeve is externally threaded to screw into the bomb. A steel bushing is screwed into the sleeve and the detonator cap is secured to the bush-ing by a collar. |
|
7 |
POSITION AND METHOD OF FIXING IN BOMB |
The fuze is screwed into the base plate of the bomb, hand-tight and extends up through the center of the tail assemb-ly. |
|
8 |
FUZE LIKELY TO BE FOUND WITH |
Normally used with M-103 or M-105 Nose fuze. |
|
9 |
COMPONENTS OF EXPLOSIVE TRAIN |
|
|
The percussion primer is a No. 26 cap. The primer of the safety fuze is black pow-der. The safety fuze is pyrotechnic mixture. The detonator is in three parts: Black powder pellet; lead azide pellet; and a tetrly pellet. The booster is the M-104 au-xiliary booster of tetrly in a bakelite case. |
|
10 |
ARMING AND FUNCTIONING TIME |
|
|
These fuzes are instantaneous on removing of the arming pin but have delay of 45 seconds (may be as long as 60 seconds but should be varied considerably) in fun-ctioning after impact due to the safety fuze. |
|
11 |
OPERATION |
|
|
On withdrawing of the arming pin when the bomb is released the fuze is armed. On impact the striker block 'sets forward' overcoming the creep spring and detonating the cap. The cap ignites the black powder pellet which fires the safety fuze. When the safety has burned its entire length the second black powder pellet which is in the detonator is fired in turn igniting the remainder of the detonator. |
| M 106A1 – |
Reduced functioning time from 45-60 seconds to 8-11 seconds. |
|
| M 106A2 – | Reduced to functioning 3-5 seconds. |
|
12 |
Remarks |
|
|
This fuze is dangerous to handle if the arming pin is out because it has a heavy striker and a weak creep spring. |
|
|
Never use this fuze horizontal glide or dive bombing if there are any fuzes of the M-100 series. |
|
|
Never use this fuze for skip or masthead bombing if there are any fuzes of the M-112 or AN-M 115 series present. |
|
|
Use the M-106 fuze for skip bombing, if there are no M-112 through M-117 pre-sent, rather than using one of the M-100 series. |
|
|
