Description
The warhead contains three smoke signature multipurpose submunitions and six simulators for use in training and for practice firing.
The complete round consists of a warhead with an integral fuze and an Mk 66 Mod 1, 2, 3 or 4 spin-stabilized, wraparound fin rocket motor.
The warhead consists of a nose cone assembly, a warhead case. an integral fuze, nine submunitions, and an expulsion charge assembly. The nose cone assembly is a plastic cone bonded to a metal cup-shaped base and is attached to the body by shear pins. The body is a hollow cylinder loaded with three full caliber practice submunitions and six simulators. Each submunition has a folded Ram Air Decelerator (RAD) which nests into the shaped charge cone of the submunition ahead. The ninth forward simulator assembles into the base of the nose cone. A metal pusher plate is located just aft of the submunition cargo stack and is forward of the expulsion charge assembly. The threaded end of the body is machined internally to accommodate a base detonating, remote settable, variable range fuze.
The primary warhead fuze, M439 RC, is a resistance-capacitance electronic variable time delay fuze. The time delay is remotely set for the desired functioning distance (time) by charging the circuit from the fire control center. The fuze begins timing at the first motion of the rocket and will function at the prescribed time if the safety and arming device (S&A) is armed. The S&A is a mechanical acceleration integrator with an unbalanced rotor holding the M84 electric detonator and a runaway escapement. An acceleration greater than 27G's is necessary to arm the fuze. The M439 RC fuze is a base mounted, forward firing fuze. The fuze connector cable extends from the fuze, through the warhead (in a lengthwise channel), and exits the ogive for connection to the launcher by an umbilical cable.
The M75 submunition consists of a steel body with a smoke signature flash charge and the identical outside configuration as the M73 HE grenade. It has the same weight and center of gravity as the loaded HE grenade. The M231 omni-directional fuze is used in this practice grenade.
The spin stabilized wrap-around fin aircraft rocket is an air to ground rocket primarily deployed from rotary-wing and other low-speed aircraft. It can also be used on Air Force and Navy jet aircraft as well as in the Mobile Ground Launcher System.
Functioning
No information about functioning.
Hazardous Components
No information about hazardous components.
See Also
Rocket Motor, 2.75 inch SSWAFAR, Mk 66 Mod 1, 2, 3, 4
Source(s)
TM 43-0001-30, Rockets (chg 14, 2001)
