Description
Proximity Fuze M728 is the latest model of the adjustable delayed-arming type designed for use with projectiles fired from 4.2-inch mortars, 105mm and 155mm howitzers, 175mm gun, and 8-inch howitzers against surface targets.
The fuze contains a radio continuous wave transmitter/detector with antennas and a power supply which performs the target detection function. A nose cone is fixed to a rotatable setting ring which has a single index line. The setting ring is connected to a clockwork timing mechanism within the fuze sleeve which energizes the proximity element u on approach to the target. In addition, a PD element is included to detonate the projectile on impact, or if the proximity element fails to operate. Graduations from 5 to 100, representing seconds to target, and a PD set line are inscribed around the shoulder of the sleeve. On this model, the PD mark coincides with the 90 second proximity setting. The plastic nose cone of the fuze has an anti static protective coating, The setting ring and sleeve are metal. The slot in the setting ring is for time setting only. Slots in the fuze sleeve are for the fuze wrench when assembling the fuze to the projectile. The fuze is shipped with the index mar alined with the 10-second mark on the fuze sleeve. The major difference between the M514A1E1 and the M728 is that the latter has a black anti-static coating which prevents the fuze from functioning prematurely during some adverse atmospheric conditions.
Functioning
No information about functioning.
Hazardous Components
No information about hazardous components.
See Also
Source(s)
TM 43-0001-28, Artillery Ammunition (chg 11, 2003)
