SCMITR was part of an experimental

military A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. It is typically authorized and maintained by a sovereign state, with its members identifiable by their distinct ...

shotgun A shotgun (also known as a scattergun, or historically as a fowling piece) is a long-barreled firearm designed to shoot a straight-walled cartridge known as a shotshell, which usually discharges numerous small pellet-like spherical sub- pr ...

ammunition Ammunition (informally ammo) is the material fired, scattered, dropped, or detonated from any weapon or weapon system. Ammunition is both expendable weapons (e.g., bombs, missiles, grenades, land mines) and the component parts of other we ...

created in the 1970s by

AAI Corporation AAI Corporation is an aerospace and defense development and manufacturing firm, located in Hunt Valley, Maryland, US. Formerly a wholly owned subsidiary of United Industrial Corporation, AAI was acquired by Textron in 2007. It currently operate ...

. It was a variation on

flechette A flechette ( ) is a pointed steel projectile with a vaned tail for stable flight. The name comes from French , "little arrow" or "dart", and sometimes retains the acute accent in English: fléchette. They have been used as ballistic weapons sinc ...

ammunition, but instead of containing a bundle of tiny needle-like

steel Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistan ...

darts Darts or dart-throwing is a competitive sport in which two or more players bare-handedly throw small sharp-pointed missiles known as darts at a round target known as a dartboard. Points can be scored by hitting specific marked areas of the bo ...

, the cartridge contained a stack of

razor A razor is a bladed tool primarily used in the removal of body hair through the act of shaving. Kinds of razors include straight razors, safety razors, disposable razors, and electric razors. While the razor has been in existence since bef ...

-edged stamped sheet-metal

arrow An arrow is a fin-stabilized projectile launched by a bow. A typical arrow usually consists of a long, stiff, straight shaft with a weighty (and usually sharp and pointed) arrowhead attached to the front end, multiple fin-like stabilizers ...

shapes designed to fly

aerodynamic Aerodynamics, from grc, ἀήρ ''aero'' (air) + grc, δυναμική (dynamics), is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dyn ...

ally. It was considered to be very promising (in terms of

lethality Lethality (also called deadliness or perniciousness) is how capable something is of causing death. Most often it is used when referring to diseases, chemical weapons, biological weapons, or their toxic chemical components. The use of this ter ...

and effective range) but prohibitively expensive to manufacture, so it has never been mass-produced.

Development

SCMITR was part of the CAWS (Close Assault Weapon System) program, which investigated ~20 mm

smoothbore A smoothbore weapon is one that has a barrel without rifling. Smoothbores range from handheld firearms to powerful tank guns and large artillery mortars. History Early firearms had smoothly bored barrels that fired projectiles without signi ...

weapons (basically

combat shotgun A combat shotgun is a shotgun issued by militaries for warfare. The earliest shotguns specifically designed for combat were the trench guns or trench shotguns issued in World War I. While limited in range, the multiple projectiles typically ...

s) designed to be effective to ranges of 150 metres against combatants wearing

body armor Body armor, also known as body armour, personal armor or armour, or a suit or coat of armor, is protective clothing designed to absorb or deflect physical attacks. Historically used to protect military personnel, today it is also used by variou ...

. Flechettes, with their high sectional

density Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematicall ...

, were ideal for penetrating rigid or soft composite armor, but the wounds caused by the tiny darts were considered insufficient to disable an enemy combatant, as the tiny hole would quickly clot and cause relatively little bleeding. The SCMITR darts had the same sectional density as flechettes, but the wide, flat shape of the SCMITR produced a larger, more disabling wound. Since the SCMITR darts were stamped from sheet metal, they had only two fins, which is not enough to provide stability. To overcome this, the fins were twisted slightly, which causes the dart to spin when flying, producing a stable projectile. The SCMITR cartridge was loaded with eight of these flechettes, each weighing about 1 gram. Dispersion was low, with all eight flechettes capable of hitting within a four-metre circle at a range of 150 metres. Retained velocity at 150 metres was 365 m/s, sufficient for the flechettes to penetrate 76 mm of pine or 3 mm of mild steel.

Applications

The SCMITR project was cancelled with the cancellation of the CAWS project in the late 1980s. The most commonly encountered photograph, in Thomas Swearengen's book ''The World's Fighting Shotguns'', shows a SCMITR shell clearly marked as a 20

gauge Gauge ( or ) may refer to: Measurement * Gauge (instrument), any of a variety of measuring instruments * Gauge (firearms) * Wire gauge, a measure of the size of a wire ** American wire gauge, a common measure of nonferrous wire diameter, es ...

, smaller than the nominal 12 gauge bore used by the AAI CAWS entry.

References

{{reflist

External links

"Up in arms"
��''Australian Shooter'' Ammunition Flechette firearms Shotgun shells

Development

Applications

See also

References

External links