Further to the point: until recently, the artillery world was divided into two camps -- those who had embraced Extended Range Full Bore (ERFB) technology and those who had not.Further to the point: until recently, the artillery world was divided into two camps -- those who had embraced Extended Range Full Bore (ERFB) technology and those who had not. ERFB adherents enjoyed the artillery benefits of ranges once regarded as in the science fiction bracket, while the more conventional gunners pointed to ERFB manufacturing and handling difficulties and to the long and heavy barrels (and carriages) that had to be used to gain maximum advantage from the ERFB. (Technology)
The debate continues, even though it has become apparent that the differences between the two camps have all but vanished. One of the main reasons is that ERFB technology has been advanced to the point where what may be regarded as the original variations from conventional projectile projectile
something thrown forward.
see blow dart.
forceful vomiting, usually without preceding retching, in which the vomitus is thrown well forward. design (the long conical streamlined outline, the necessary and expensive bore-riding nubs and drive band niceties ni·ce·ty
n. pl. ni·ce·ties
1. The quality of showing or requiring careful, precise treatment: the nicety of a diplomatic exchange.
2. ) have now been all but eliminated. The latest generation of projectiles has all the long-range advantages of the early ERFBs but now combined within a seemingly conventional but still carefully profiled and streamlined package.
Most of the old carpings relating to relating to relate prep → concernant
relating to relate prep → bezüglich +gen, mit Bezug auf +acc ERFB (Extended Range Full Bore) have also all but vanished. Artillery fire control system capabilities can take full advantage of the 50,000-metre plus ranges now possible. Target acquisition at such ranges, once a major argument against the immediate procurement of ERFB, can be overcome by the employment of suitable remotely controlled aerial platforms or even space satellite observation. Such measures may be taxing in terms of cost, resources and skilled personnel, but to the gunner the expense is worth such investments. Apart from the fact that battlefield survivability sur·viv·a·ble
1. Capable of surviving: survivable organisms in a hostile environment.
2. That can be survived: a survivable, but very serious, illness. chances are enhanced and fewer gunners are needed, a single ERFB-equipped battery can deliver payloads to a much larger swathe swathe 1
tr.v. swathed, swath·ing, swathes
1. To wrap or bind with or as if with bandages.
2. To enfold or constrict.
A wrapping, binding, or bandage. of terrain than is possible with more conventional batteries, and with better long range accuracy than was once the case.
As for the criticisms regarding barrel length, 52-calibre barrels are now accepted as a norm.
These recent changes can be readily appreciated by an examination of the Assegai family of 155 mm projectiles available from Naschem, part of Denel in South Africa South Africa, Afrikaans Suid-Afrika, officially Republic of South Africa, republic (2005 est. pop. 44,344,000), 471,442 sq mi (1,221,037 sq km), S Africa. . The South Africans This is a list of notable South Africans with Wikipedia articles. Academics, Medical and Scientists
Naschem has developed its 155 mm Assegai family to the point where not only is it optimised for the latest 52-calibre barrels but also compatible with 47-, 45- and 39-calibre barrels. This is a considerable technical achievement brought about by, among other details, a carefully designed drive band configuration. In addition, the revised bourrelet outline (that is, the nose shape) renders it fully compatible with Nato standard requirements (the original ERFBs were not). Assegai projectile natures remain as varied as with the original ERFB generation, including cargo (containing 42 dual-purpose bomblets with self-destruct mechanisms), illuminating, smoke and incendiary INCENDIARY, crim. law. One who maliciously and willfully sets another person's house on fire; one guilty of the crime of arson.
2. This offence is punished by the statute laws of the different states according to their several provisions. payloads. All projectiles within the Assegai family are ballistically matched, including a practice projectile with a spotting charge.
Assegai ranges are considerable once base bleed Base bleed is a system used on some artillery shells to increase their range, typically by about 30%.
Most of the drag on an artillery shell comes from the nose of the shell, as it pushes the air out of its way at supersonic speeds. (or base burn -- BB) units are added to the projectile bases. Existing BB units can be employed with Assegai projectiles so that ranges of more than 40,000 metres can be achieved from a 52-calibre barrel. Even without BB the maximum range is over 30,000 metres.
For HE (High explosive) rounds, the Assegai on-target effects are considerably amplified by the 8.3 kg TNT TNT: see trinitrotoluene.
in full trinitrotoluene
Pale yellow, solid organic compound made by adding nitrate (−NO2) groups to toluene. payload creating more lethal fragments than more conventional equivalents, thanks to the forged high grade steel employed for the shell casing.
At one time the most widely applied method of extending the ballistic trajectories of artillery projectiles was adding a rocket motor to be ignited at the point during the trajectory where the initial barrel-induced momentum starts to fade away Verb 1. fade away - become weaker; "The sound faded out"
dissolve, fade out
change state, turn - undergo a transformation or a change of position or action; "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the . This technique, Rocket-Assisted Propulsion or Rap, has been widely adopted, especially in the USA where it was for long preferred as a range extension technique, even after BB became available. The application of BB results in far better long range accuracy than when using Rap as there are too many variables regarding rocket ignition and burn times, even after following carefully-controlled manufacturing and handling procedures. As BB merely disrupts tail drag eddies and does not impart any propulsion, its effects can remain fairly constant compared to those for Rap.
However, Rap can still impart extra range and has thus been adopted, by Somchem in association with Naschem, for the Velocity-enhanced Long Range Projectiles (V-Lap), but in association with BB. First applied to the original `nubbed' Naschem/Somchem HE ERFB projectile, the V-Lap approach has now been adapted for the Assegai M2005 HE projectile. After firing, the BB unit ignites as before and is completely consumed before the Rap motor is ignited. The resultant thrust then provided enables ranges of over 53,000 metres to be reached when 52-calibre barrels are involved. There are few gunners who would consider firing V-Lap from anything less than the optimum 52-calibre barrels, although even when fired from a 39-calibre barrel Assegai M2005 HE V-Lap range is still over 41,000 metres.
Needless to say, this performance enhancement has to be paid for. The Rap and BB units occupy space inside the V-Lap projectile so the payload has to be reduced to 4.5 kg of TNT. It is doubtful if a recipient would appreciate the difference in the resultant detonation, especially if the V-Lap projectile is delivered to a target previously thought of as safely within a rear area.
Naschem and Somchem have yet to finish with the V-Lap concept. It is understood that they are currently investigating the installation of a nose-located ramjet ramjet: see jet propulsion.
Air-breathing jet engine that operates with no major moving parts. It relies on the craft's forward motion to draw in air and on a specially shaped intake passage to compress the air for combustion. motor that will start to produce thrust only when the projectile's maximum velocity maximum velocity
1. The maximum rate of an enzymatic reaction that can be achieved by progressively increasing the substrate concentration.
2. has been achieved soon after firing. No range figures have yet been announced but they will no doubt display a considerable improvement compared to current achievements.
Leo Leo, in astronomy
Leo [Lat.,=the lion], northern constellation lying S of Ursa Major and on the ecliptic (apparent path of the sun through the heavens) between Cancer and Virgo; it is one of the constellations of the zodiac.
Before leaving the South African scene, mention must be made of the recently announced Denel 105 mm Light Experimental Ordnance, or Leo. Leo is an interesting development for, until only a few years ago, the 105 mm calibre was becoming increasingly neglected, apart from a few exceptions such as the BAE Systems/RO Defence 105 mm Light Gun. The 155 mm calibre offers so much potential range, destructive effect and versatility that, within most armies and apart from special or airborne forces Airborne forces are military units, usually light infantry, set up to be moved by aircraft and 'dropped' into battle. Thus they can be placed behind enemy lines, and have an ability to deploy almost anywhere with little warning. , applications for 105 mm artillery have seemingly dwindled.
Recent developments have instigated a rethink. As the prospects of full-scale warfare between major powers are reducing by the year, the need for any extensive retention of heavy artillery See: field artillery. calibres, including 155 mm, is being increasingly questioned. 155 mm artillery is heavy, bulky, expensive and demanding in personnel, so any alternative is now being considered when it is offered.
The Denel Leo approach could be just such an alternative. It has to be emphasised that the prototype Leo was constructed merely as a technology demonstrator and was never intended to be a practical field piece in its present form. Even so, the Leo test bed promises much.
Leo is a towed, split-trail design with a 105 mm 52-calibre barrel, or 57 calibres if the rifled muzzle brake A device attached to the muzzle of a weapon that utilizes escaping gas to reduce recoil. is considered. It fires a 15.8 kg high explosive, pre-formed fragment (HE-PFF) projectile to a range of 24,000 metres, considerably less than for modern 155 mm equipment, but the gun and carriage weight is less than four tonnes. That range is without BB as compatible units are still under development. It is anticipated that with BB the maximum range will increase to 30,000 metres. A combustible com·bus·ti·ble
Capable of igniting and burning.
A substance that ignites and burns readily. modular propellant pro·pel·lant also pro·pel·lent
1. Something, such as an explosive charge or a rocket fuel, that propels or provides thrust.
2. charge system has been involved with Leo since its conception.
The Leo 105 mm projectiles are scaled down versions of the Assegai family, essentially having a similar profile and made from the same special high grade fragmenting steel -- the HE-PFF projectile with a proximity fuze proximity fuze
An electronic device for detonating a warhead as it approaches a target, used in antiaircraft shells. Also called VT fuze. is stated to produce a lethal radius greater than a 155 mm HE M107 projectile. In the pipeline are smoke, illumination and cargo projectiles, the latter carrying 15 dual-purpose bomblets. One unusual feature regarding Leo is that its barrel length enables it to fire 105 mm armour-piercing, fin-stabilised, discarding sabot (APFSDS APFSDS Armor-Piercing Fin-Stabilized Discarding Sabot ) projectiles normally fired from tank guns and with similar on-target effects, considerably extending the combat potential of what was meant to be a field artillery piece.
At the time of writing it was understood that all further development of the Leo had been suspended, not for technical reasons but for the usual future financing problems. However, it is difficult to believe that the potential of the Leo will be lost.
Good as the Assegai, V-Lap and Leo projectiles might be, they remain `dumb' in that they lack `smart' target-seeking guidance. Examples of current smart system submunitions are limited to the Giat/Bofors Bonus and the Rheinmetall SMArt 155, the US M898 Sadarm having finally been laid to rest after the expenditure of many millions of dollars. Similar systems have been mentioned from within the old Eastern Bloc During the Cold War, the term Eastern Bloc (or Soviet Bloc) was used to refer to the Soviet Union and its allies in Central and Eastern Europe (Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, Romania, and—until the early 1960s—Albania). but they do not appear to have advanced much beyond the early development or search for technical co-operation stage. 152 and 155 mm examples of the Russian Krasnopol laser-guided projectile have been produced in quantity but no follow-on has yet appeared (although a Krasnopol technical package has been sold to Norinco of China). Any remaining US M712 Copperheads are now fast approaching (or even past) the end of their anticipated service lives.
Perhaps the main reason for this stasis stasis /sta·sis/ (sta´sis)
1. a stoppage or diminution of flow, as of blood or other body fluid.
2. a state of equilibrium among opposing forces. is that there no longer appears to be targets for such technical marvels. All the smart systems mentioned above were intended for the attack of massed armoured formations in the event of major conflict. The chances of such formations or major conflicts ever appearing are becoming increasingly unlikely as time passes; at least as far as the few major armament procurement nations who can afford such expensive and elaborate items are concerned. Consequently, those Bonus and SMArt 155 systems already ordered and in the manufacturing process at present will probably be the last of their type, even if they are still being marketed, this time as counter-battery weapons.
The growth in potential range has brought some novel problems in its wake. Although artillery is an area weapon, as opposed to a point contact weapon, the area to be covered to neutralise a target (the footprint) still needs to be relatively compact to be effective. At long ranges the variables that can influence a projectile trajectory become considerable, resulting in an oversized o·ver·size
1. A size that is larger than usual.
2. An oversize article or object.
adj. o·ver·size also o·ver·sized
Larger in size than usual or necessary. footprint and leading to the need to fire more projectiles to ensure the target is dealt with as intended. Some method of reducing such dispersions to manageable proportions is required -- and it comes in the form of trajectory correction.
Terms such as trajectory correction induce visions of guided missiles with small wings and tails, but the systems developed to date are concerned only with range alteration. Azimuth azimuth (ăz`əməth), in astronomy, one coordinate in the altazimuth coordinate system. It is the angular distance of a body measured westward along the celestial horizon from the observer's south point. (or line) corrections are still in the future and are likely to be costly, whereas range correction is relatively straightforward and available now. However, full trajectory correction projectiles are under development. One example is the Bofors Defence 155 mm Trajectory Correctable Munition (TCM (1) (Trellis-Coded Modulation/Viterbi Decoding) A technique that adds forward error correction to a modulation scheme by adding an additional bit to each baud. TCM is used with QAM modulation, for example. ), with a number of small impulse motors around the centre of the projectile body acting in association with spring-out tail stabiliser Noun 1. stabiliser - a device for making something stable
device - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water" fins. TCM testing is in progress but a service model is still some way off.
The key to both range and line correction is the Global Positioning System Global Positioning System: see navigation satellite.
Global Positioning System (GPS)
Precise satellite-based navigation and location system originally developed for U.S. military use. (GPS). GPS satellites can provide precise geographical positioning of almost any point on the ground, so if gun and target positions are known the trajectory can be calculated to keep any impact footprint `tight'. Once the projectile has been fired at high barrel elevation to a position beyond the intended target, its in-flight position can be determined with considerable precision by a GPS receiver in a fuze-sized package on the projectile nose. Micro-processors in the GPS receiver can calculate exactly when small spoiler spoiler: see airplane.
1. spoiler - A remark which reveals important plot elements from books or movies, thus denying the reader (of the article) the proper suspense when reading the book or watching the movie.
2. vanes can be extended from the receiver body to ensure the vanes can affect the trajectory and make the projectile fall within the required area.
Several programmes to develop range correction systems are known to be under development but only one need be mentioned. It is the one undertaken by a consortium of Thales Missile Electronics, BAE Systems/RO Defence, Rockwell Collins Rockwell Collins, Inc. (NYSE: COL) is a large United States-based international company headquartered in Cedar Rapids, Iowa, primarily providing aviation and information technology systems, solutions, and services to governmental agencies and aircraft manufacturers. , and the UK Defence Research and Evaluation-Agency (now known as QinetiQ). The consortium is known as Team Star (Smart Trajectory Artillery Round) and their product (not yet in production) resembles an ordinary nose fuze fuze
n. & v.
Variant of fuse1.
Noun 1. fuze - any igniter that is used to initiate the burning of a propellant
fuse, primer, priming, fuzee, fusee . However, that fuze body (described as a fuze upgrade) is packed with all manner of advanced electronics and associated mechanisms.
Range correction principles can also be applied to artillery rocket systems. Rockets have always been regarded as area coverage weapons but recent rocket motor propellant improvements have doubled the maximum ranges once possible, and more improvements are on the way. A typical example is the widely deployed Russian 122 mm BM-21 Grad (Hail) in its many forms. The latest BM-21 rockets can reach 20,000 metres instead of 11,000 metres, while 32,000 metres versions are on the way. At such ranges, relatively low velocity artillery rockets can be assaulted by numerous influences, so the introduction of a range correction system could be a considerable advantage.
Range correction systems are also under consideration for the MLRS MLRS Multiple Launch Rocket System (US DoD)
MLRS Multiple Launcher Rocket System
MLRS Marine Corps Long-Range Study (US DoD) , the Contraves Rheinmetall Enhancement Correction for Trajectories (known as Corect) being but one example. Similar systems have been introduced by Israel Military Industries (IMI IMI International Masonry Institute (Washington, DC)
IMI Israel Military Industries
IMI Institute of the Motor Industry
IMI International Market Insight
IMI Imposto Municipal Sobre Imóveis (Portugal) ) for its AccuLAR 160 mm rocket system. AccuLAR employs a nose-mounted gas generator an apparatus in which gas is evolved
a retort in which volatile hydrocarbons are evolved by heat
a machine in which air is saturated with the vapor of liquid hydrocarbon; a carburetor
a machine for the production of carbonic acid gas, for aërating water, bread, etc. to introduce course corrections so some measure of line correction could be introduced as well.
Perhaps the most complex artillery projectile currently in the pipeline is the 155 mm XM982 Excalibur under development from a US team led by Raytheon Systems. Intended to have a maximum range of some 57,000 metres when fired from the XM297 barrel of the XM2001/XM2002 Crusader advanced field artillery system (Afas), the XM982 will employ GPS-based course correction to deliver extreme accuracy at extreme ranges -- one of the planned warheads is described as a `unitary' bunker buster, implying a point target. Now that the Sadarm has been abandoned the only current alternative XM982 payload comprises dual-purpose bomblets.
The XM982 attains its range by gliding throughout much of its trajectory, using spring-out tail fins and canards to assist the process. The canards also introduce course corrections.
However, the word on the block is that the XM982 is running into the usual cost overrun problems, so we await news regarding its future.