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M734 multi-option fuze
#WIP FUZES
Region
United States
Category
Ammunition, Missiles and precision weapons
Armament 60 mm mortar bomb, M224 and 81 mm mortar bomb, M252 or any bomb with fuze cavity threads of 1.5-12-UNF-1A. Development By US Army Ordnance. Description The M734 is a multi-option fuze that may be set in any one of four options: proximity with burst height of 1 to 4 m; near surface burst with burst height of 0 to 1 m; super-quick impact and delay of 50 to 1.5 ms. The fuze is delivered in proximity mode, but settings can be changed manually by the user. The fuze is made safe by restraining the rotor with an
acceleration/time sensing device and an airflow-operated detent. The fuze is set by rotating the head to the desired function. Upon firing, setback forces move a weight rearward through a zig-zag track to sense proper time and acceleration. This partially releases the rotor and frees a turbine alternator. In flight, airflow through the turbine retracts the threaded detent, completely freeing the rotor. The rotor is spring driven and, when free, moves into the `armed' position, completing the fuze electrical circuits. The alternator also powers the fuze electronics, including a timing circuit that delays firing until 2 to 3 seconds after the rotor has fully armed. When the continuous-wave radio frequency Doppler radar signal reaches the proper value, the firing circuit functions, firing the M100 detonator. When set SQ, an electric switch closes at impact and fires the M100 detonator. When set delay, an inertial firing pin functions a delay that initiates the M61 detonator. Manufacturer US government contractors.