Description
This electronic fuze is designed to be base mounted in flechette and cargo warheads. The output is a forward, axially directed detonation. It is a resistance capacitance variable time delay fuze which allows the pilot to remotely set the fuze for an air burst at the desired functioning range from the round. The fuze and Remote Set Fuze Subsystem are calibrated to provide proper standoff of the warhead when fired at ranges of five hundred (500) to six thousand nine hundred (6900) m.
The fuze consists of a module plastic housing assembly, a safety and arming device plastic housing, a mechanical safety and arming device, and a molded electronics assembly.
The S&A device consists of an unbalanced rotor assembly which houses the M84 electrical detonator, an escapement and gear assembly (delay mechanism), a single pole double-throw (SPDT) switch, and a spring loaded setback weight. The SPDT switch is in the closed position to connect the fuze electronic time circuit to the umbilical cable assembly for charging.
On initial setback, the switch is transferred to the open position which disconnects the fuze time circuit from the umbilical assembly, as a safety provision. If the fuze is armed or partially armed prior to rocket launch, it cannot be charged. A rocket launch in this condition will result in a dud. The detonator is held shorted and disconnected from the fuze circuit until it reaches an in-line position with the expelling charge.
The fuze must be subjected to a sustained acceleration in order to arm. If acceleration is too low, the spring loaded setback weight will not release the rotor. If acceleration is sufficient for the setback weight to release the rotor, but time-of-acceleration (rocket motor burn) is too short, the setback weight will return the rotor to the unarmed (safe) condition.
The fuze has a selectable time delay range which may be set manually by the pilot or automatically by the advanced fire control system. It has no internal battery and the required voltage is supplied by the aircraft via the Remote Set Fuze Subsystem, just prior to firing the round.
If the fuze has been charged and fired, and duds, it will take approximately 45 days for the charge to decay so that the fuze is safe. If the fuze is set (charged) and the motor fails to ignite, it may be loaded into another tube and fired. The fuze may be set a second time; however, it will function longer than set time and should not be used for accurate measurements: for accuracy, 10 days should elapse before resetting.
Functioning
No information about functioning.
Hazardous Components
No information about hazardous components.
See Also
Nothing else to see.
Source(s)
TM 43-0001-30, Rockets (chg 14, 2001)
