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| U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS |
| SECTION III - BOMB FUZES |
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DATA: |
U.S. NAVY NOSE FUZE |
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Mk 233 |
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BOMBS USED IN |
100 lb. G.P. Mk 4, Mod 4 | |
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FUNCTIONING |
Electrical impulse | |
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ARMED CONDITION |
When cable is pulled free | |
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from rotor cap, and cap | |
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is in a locked condition. | |
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FUZES USED WITH |
Used in conjunction with |
(Spezial) |
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bombs which are fuzed | |
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with U.S.N. Mk 232 Mod 1 |
ELECTRICAL FIRING |
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ARMING TIME |
Rotation of the rotor cap | |
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180 degrees, when pulled |
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by the cable attached to it. | |
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OVERALL LENGTH |
4.51" | |
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MAX. BODY DIAMETER |
2.375" | |
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MATERIAL |
Steel. |
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GENERAL: |
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The fuze will function instantly upon explosion of the electric semi-cap. It is mech-anically armed by means of a motor in the plane. The body is that of an AN-Mk 219, in which the vanes, cap, and rotors have been removed, and a hole has been drilled in the shoulder for the accomodation of electric wiring. A rotor block has been inserted in the rotor cavity in the fuze body. The rotor blocks contains an electric semi-cup with lead-in wires and a detonator. These units are assembled, unarmed, 180 degrees from the booster lead-in in the fuze body. |
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OPERATION: |
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In the unarmed position the detonator in the rotor is off-set 180 degrees from the booster lead-in. To arm the fuze, the rotor is rotated 180 degrees at which point the detonator and booster lead-in are aligned. This is accomplished by means of a motor in the airplane, exerting a pull on one end of the arming cable. This pull rotates the pulley to which the other end of the cable is secured, and thereby rotates the rotor to the armed position. There it is locked by the lock detent. Continuing force of the motor's pull on the arming cable shears the 0.035" copper shear wire which secures the cable to the pulley. |
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The protective shipping cap covering the connector plug is removed when the fuze is assembled to the bomb and connection is made with the source of electrical current in the airplane. Closing the electrical circuit after the fuze is armed successively initiat-es the semi-cap, detonator, booster charges and explosive charge in the bomb. |
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REMARKS: |
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The detonator consists of lead azide, and the booster lead-in and booster consist of tetryl. |
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