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by The Unitary Technocracy of Etoile Arcture. . 4 reads.

M92 Arblast Improved Multipurpose Attack Weapon

This page is a work in progress by its author and should not be considered final.

M92 "Arblast"


Type

Multi-role (anti-armor,
anti-fortification, anti-
personnel)

Place of origin

Etoile Arcture

Service history

In service

2005 - present

Used by

Etoile Arcture
Ground Forces

Arme de Terre
Royal Imbrinium
Marine Corps

Production history

Designer

Sequoia Dynamics

Designed

1997-2002

Manufacturer

Sequoia Dynamics
Armament And
Technical Products

Unit cost

US$15,000

Number built

only Count von Count knows

Variants

See below

Specifications

Weight

13.5 kg (with sights)

Length

1200 mm

Crew

2 (gunner, loader)


Calibre

88.9 mm

Muzzle velocity

250-270 m/s

Rate of fire

3 rounds per minute (practical)

Effective firing range

600 m (point target)

Maximum firing
range

2,000 m (area target)

Feed system

detachable single-rocket casing

Sights

iron sights, clip-on
electro-optic sight

The M92 "Arblast" Improved Multipurpose Attack Weapon (IMAW) is a lightweight, multifunctional, single man or crew-served, 3" (88.9 mm) calibre, shoulder-launched, reusable weapon system used against infantry, vehicles, structures, emplacements and fortifications. The M92 consists of three major sub-assemblies:

1. Reusable launcher unit with high reliability electro-mechanical firing mechanism;

2. Reusable clip-on day/night/laser sight combining target acquisition, fire control and warhead fuse programming functions;

3. Disposable munition canister that loads into the breech end of the launcher containing a pre-loaded free-flight rocket with smart electronic fuse and tandem high-effect warhead.
The weapon is designed to be operated by a crew of two personnel (a gunner and a loader), but can rapidly be brought into action by a single crewperson in an emergency. A trained and experienced crew can load/reload, sight, program and fire a round in under 20 seconds. The weapon can be launched from a prone, kneeling or standing position, and has a soft-launch fire-from-enclosure (FFE) capability from ventilated rooms and bunkers.
The M92 IMAW is derived from many key elements of the disposable M90 "Arrowhead" Improved Lightweight Attack Weapon (ILAW), including mechanical, electrical and pyrotechnic components, warheads, propulsion systems and fire control. Available munitions also mirror those developed for the M90 ILAW, include bunker-buster, thermobaric, anti-personnel and anti-armour warheads that are actuated by impact, impact/delay and timed air burst fuses programmed by an Emerson Optronics XM743 Day/Night/Laser Sight that is electronically coupled to the launcher.


M92 Arblast Improved Multipurpose Attack Weapon broken down into its component
parts: the separate firing mechanism with pistol grip controls, folded forward grip
and shoulder rest; and a detached disposable launch tube/shipping container
assembly, shown with the transport end-cap still attached.

Description


The M92 breaks down into a reusable clip-on sight and two man-portable elements: a reusable launcher unit with moulded pistol grip containing the trigger and ambidextrous safety levers, folding forward hand grip and shoulder rest, arming and launching mechanisms, mounting plate with electrical connections for the clip-on sight and smoothboore open launch tube; and a rocket encased in a disposable shipping container that loads into the breech end of the launcher. Both assemblies are constructed as single-piece mouldings of filament-wound glass-reinforced plastic (GRP) with a high temperature and flame resistant epoxy gel coat lining the bore. The throat of the launcher is further reinforced by a light aluminium liner that provides a minimum service life of at least 100 firings before needing disposal.
The munition container is pre-loaded with the munition - a folded fin-stabilised unguided free-flight rocket - and a low-smoke producing expeller charge. The tube is fully sealed with fire-through plastic covers, rubber gaskets and frangible discs to secure and protect the encased rocket. A back blast diffuser containing compressed ceramic powder ballast is built into the rear end cap of the container. On firing the gas that is vented rearwards is absorbed by the ballast to reduce blast and launch signature, and act as a counter-mass to dampen recoil.

Operation


When inserted into the launcher unit the round completes the firing circuit and is ready to fire on release of the safety catch and pressing of the trigger to generate an electrical impulse to the firing mechanism. On firing the rocket is ejected from the container by a low flash/smoke generating expeller charge that produces a minimum launch signature, and then powered by a sustainer motor that ignites on a delay as soon as it leaves the launch tube. The propellant grain ensures the rocket motor burns consistently throughout the time of flight to maintain a constant velocity and flat trajectory towards the target with minimum drift to affect accuracy. In-flight spin stabilisation is provided by eight spring-locked folding switchblade fins that deploy immediately upon leaving the launch tube.

Specifications

Munition

M922A2 HEAA

M923A1 MPP

M925E1 HIT

Warhead

tandem HEAT

HESH +
follow-through
grenade

HESH +
follow-through
thermobaric

Muzzle velocity

270 m/sec

240 m/sec

250 m/sec

Armour penetration performance

740 mm in RHAe
after ERA @ 300 m

457 mm in RHAe
after ERA @ 600 m

740 mm in RHAe
after ERA @ 300 m

Wall penetration

triple brick/double
reinforced concrete

masonry 75-100 cm mousehole

masonry 50 cm hole

Maximum effective
range

1,200 m

1,000 m

500 m

Fusing

impact or delay

impact, delay or variable

impact only

Ammunition


All warheads are based on the M90 Arrowhead family of rocket-assisted multipurpose munitions.

  • The M922A2 HEAA (High Explosive Anti-Armour) rocket is configured around a tandem high-explosive anti-tank (HEAT) armour defeat mechanism, consisting of a probe fitted with a point-initiating base-detonating (PIBD) piezoelectric fuse and 100 g shaped charge precursor to initiate explosive reactive armour (ERA) blocks at stand-off distance, and a 500 g full-calibre shaped charge to defeat composite armour and armour plate behind ERA and produce beyond-armour effects. The main shaped charge is configured with an insensitive plastic-bonded explosive (PBX) filler and hollow conical bonded bimetallic liner. The liner is deformed on detonation to focus the explosive force as a narrow high-velocity jet of molten metal able to perforate 29 inches (740 mm) of homogenous steel. Single shots are effective against the side, rear and top armour of main battle tanks, and two shots effective against the frontal arc (the first to knock out ERA and partly penetrate frontal armour, and the second to travel through the initial hole to complete the penetration.) The warhead can also be employed in an anti-materiel role against light armoured vehicles and field fortifications.

  • The M923A1 MPP (Multi-Purpose Programmable) rocket is the most common variant due to its versatility and is primarily designed for barrier penetration and neutralising troops inside buildings and bunkers, or behind reinforced concrete, brick or stone walls. It is similarly arranged in a tandem layout but with a crushable double ogive housing a PIBD fuse connected to a multifunctional electronic time (ET) fuse with dual mode impact/graze and impact-inertia-fired delay functioning powered by a setback generator on firing and programmed with range data; a high-explosive squash head (HESH) break-in charge that punches holes through walls; and a high-explosive follow-through (HEFT) grenade derived from the M8 offensive/defensive grenade containing 4,000 pre-formed forged steel ball fragments. The programmable ET fuse allows selection between three modes of operation to match different classes of targets.

    • Delay Action (DA) fuses the HESH precursor in impact mode to break through the target leaving a hole that allows the HEFT grenade to enter the structure, where it detonates on a piezoelectric delay fuse to produce behind-the-target fragmentation effects.

    • Super Quick (SQ) mode is optimised for dynamic breaching or mouse-holing. The break-in charge and follow-through grenade are fused to detonate in quick succession on contact by PIBD impact/graze fuse as if a unitary HESH charge. The enhanced blast effect has a circular cutting motion that creates a man-sized "mousehole" without compromising the structural integrity of the target. This mode is also effective against fortifications, emplacements and light armoured vehicles.

    • Variable Time (VT) mode is used for anti-defilade defeat. A time delay is set for a particular range by the fire control system (using laser rangefinder data) so that the weapon can employ a timed air burst to produce maximum fragmentation effects against troops in open terrain, entrenchments and dense vegetation.

  • The M925E1 HIT (High Impulse Thermobaric) rocket is based on the M923 MPP pattern with the follow-through fragmentation grenade exchanged by a metal augmented charge (MAC) and a setback-armed PIBD fuse. The warhead contains a novel explosive (NE) consisting of an insensitive plastic-bonded explosive (PBX) bursting charge and slurry of reactive metal and liquid fuel to produce the thermobaric effect. The high sustained blast overpressure this produces is effective against personnel in both open terrain and confined spaces including entrenchments, fighting positions, and clearing multiple rooms within a building or bunker.

    Users


    Etoile Arcture

    • Etoile Arcture Ground Forces

    Arcturia

    • Arme de Terre

    • Corps des Marines

    Imbrinium

    • Royal Imbrinium Army

    • Royal Imbrinium Marine Corps

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    Specifications (M92 Arblast)


    • Diameter: 88.9 mm

    • Overall length: 1200 mm

    • Unloaded length: 800 mm

    • Weight, ready to fire: 13.5 kg complete w/ sights

    • Feed system: reusable

    • Practical rate-of-fire: 3 rounds/min

    • Backblast danger zone: 5 m

    • Maximum effective range: 600 m

    • Maximum range: 1.2 km

    • Maximum sighting range: 2 km w/ electro-optics

    • Primary sights: clip-on day/night/laser sight

    • Operational temperature range: -46C to +71C

    • Shelf life: 10 years

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