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energy (product of acceleration and time) is not sensed throughout the arming distance. Upon |
impact, the firing pin body walls are crushed between the target and the oncoming fuze body. The |
firing pin contained in the firing pin body then impacts the oncoming S&A mechanism within the |
fuze body, initiating the explosive train. The explosive consists of the M104 primer, M85 |
detonator, lead, booster and warhead explosive which are initiated in sequential order. The M423 |
is used for launch from low speed aircraft. The M427 is a variation used for launch from high |
speed aircraft and requires 180 to 426 meters rocket travel to arm. The PD fuzes do not require |
an umbilical connection to the launcher. |
Tabulated data: |
M151 HEPD Rocket w/ MK 66 MOD 3 Motor |
DODIC: H583 |
Hazard Classification: Quantity-Distance Class 1.1, Storage Compatibility Group E |
UNO Serial No. 0181 |
DOT Label "Explosive 1.1E", Proper Shipping Name "Rockets" |
M151 Warhead w/ M427 |
NSN: 1340-00-725-8382 |
DODIC: H842. |
M229 HEPD Rocket w/ MK 66 MOD 2 Motor |
NSN: 1340-01-309-8300 |
DODIC: H642 |
UNO Serial No. 0181 |
DOT Label "Explosive 1.1E", Proper Shipping Name "Rockets with Bursting Charge". |
an integral fuze, 9 submunitions, and an expulsion charge assembly. The nose cone assembly, a |
of 80% M10 double base propellant and 20% Class 6 black powder. The expulsion charge is |
stack of submunitions through the nose cone. |
The primary cargo warhead fuze is the M439 Fuze. It 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, providing a variable range of 0.5 to 7.2 |
kilometers. The fuze does not have an internal battery; instead energy is supplied from by the |
aircraft setter at the time of fuze setting. The energy is stored in a capacitor and will operate the |
electronic timer and fire the M84 electronic detonator. The charging cycle takes place |
approximately 50 milliseconds prior to rocket motor firing. The fuze begins timing at the first |
motion of the rocket and will function at the prescribed time if the Safety and Arming (S&A) |
device is armed. The S&A mechanism also prevents the fuze from being charged if it is in the |
partially-armed or fully-armed position. 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 is necessary to arm the fuze. The M439 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 connector. |
The HE, MPSM M73 Grenade consists of a steel body with a fragmenting wall filled with |
Composition B explosive incorporating a shaped charge liner, LX14 booster, explosive lead |
charge, M230 omnidirectional fuze with M55 detonator, wave shaper, and fabric drag device |
(RAD). The fragmenting body produces 10 grain fragments with a maximum velocity of |
approximately 5,000 feet per second. The shaped charge sprays lethal fragments nearly horizontal |
360 degrees. The submunitions consistently impact within a 40-meter radius of each other. |
Submunition self destruct has not been a consideration. EOD procedures obviate the need for self |
destruct. Lethality (penetration) is classified and can be made available through licensed |
agreement. The performance is roughly a 70 percent (SMCAR-CCH-A Memorandum, 23 Jun |
1988) increase in lethal area over the M151. |
Tabulated data: |
M261 MPSM Rocket w/ MK 66 MOD 3 Motor |
NSN: 1340-01-269-1447 |
DODIC: H165 |
Hazard Classification: Quantity-Distance Class 1.2, Storage Compatibility Group E |
UNO Serial No. 0182 |
DOT Label "Explosive 1.2E", Proper Shipping Name "Rockets". |
Temperature Limits: |
Firing: -50 oF to +150 oF |
Storage: -50 oF to +160 oF |
The M255A1 Flechette Warhead is intended to be used against light material and personnel |
targets. The warhead is also a cargo warhead, using the M439 Fuze, and functionally equivalent |
to the M261 cargo warhead. At expulsion, 1,179 flechettes separate and form a disk-like mass |
which breaks up with each flechette assuming an independent trajectory, forming a repeatable |
produce the desired impact and penetration effect on the target. |
Tabulated data: |
M255A1 Flechette w/ MK 66 MOD 2 Motor |
NSN: 1340-01-309-5799 |
DODIC: H462 |
Flechette: 60 grain, steel, phosphate coated |
Hazard Classification: Quantity-Distance Class 1.4, Storage Compatibility Group G |
UNO Serial No. 0191 |
DOT Label "Explosive 1.4G", Proper Shipping Name Rockets" |
The M264 RP Smoke is also a cargo warhead. The warhead is used as a red phosphorus (RP) |
filled smoke rocket propelled by the MK 66 motor and functions at a remote settable range from |
1000 to 6000 meters. Upon functioning, the M439 Fuze ignites the expulsion mix which |
rows of 4 each and are separated by felt pieces impregnated with a phosphine gas adsorbent |
mixture, manganese dioxide/cuprous oxide. |
Tabulated data: |
M264 RP Smoke w/ MK 66 MOD 3 Motor |
NSN: 1340-01-289-4719 |
DODIC: H184 |
RP: JXS-10 Smoke Composition Pellets, 0.035 kg/wedge (31.5 gms) |
UNO Serial No. |
DOT Label "Explosive 1.4G", Proper Shipping Name Rockets" |
The M257 illuminating warhead consists of an ignition system, flare, main parachute, drogue |
feet at 3000 meters downrange. The M257 candle descends at 15 feet per second, burns for |
Except for the illuminent, the M278 is identical to the M257 warhead. At the aft end of the |
Separation and Drogue Assembly is the Motor Adapter which is the threaded interface for the |
launch rocket motor. Inside the adapter is the M442 fuze which initiates the firing sequence for |
the M278 flare. The fuze must sense an acceleration of at least 17-22 G for about 1 second prior |
to arming. Upon deceleration of the burnt-out rocket motor the armed fuze fires, directing its |
output into a 9-second pyrotechnic delay column which in turn ignites a separation charge. The |
separation charge produces a rapid increase in pressure inside the motor adapter which is reacted |
by a pusher plate on top of the Drogue Housing. This shears 12 holding pins that are evenly |
spaced around the circumference of the joint. The pressure also provides an accelerating force for |
the flare and a decelerating force for the launching rocket motor with the Motor Adapter |
attached. This ensures positive separation for the flare, and a Deflector plate pulls the expended |
motor out of the flare flight path. When the Pusher Plate falls into the airstream it pulls the |
Drogue Chute out of the aft end of the Drogue Housing. Attached to the shroud line bridle of the |
Drogue Chute is a nylon cord which is attached to the Pull Wire “Quickmatch” of a 2-second |
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