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Roller Abraham Roller i erhvervslivet VideoAbraham shows us how to do a roller
In traditional roller derby, the game has eight minute periods, again with second jams. Jams began and ended on the referee's whistle, and a buzzer sounded to reinforce this.
Whereas traditional derby employs a pivot skater, RollerJam did not use one. Instead, each team had three blockers, each wearing a white helmet, and two jammers, each wearing a black helmet with red stripes.
In-line skates were legalized in attempt to modernize the sport, but certain skaters opted still to use the quad skates.
In seasons , this changed to every single jam starting from a standstill start from the black line. In either case, jammers had to start from the back of the pack the whole group and work their way through, with the first jammer to break out winning the status of lead jammer.
The skaters then got one point for every opponent they successfully lapped. The lead jammer could cut off the jam early by placing their hands on their hips.
The last jam of the last period always went the full minute regardless of what the period clock showed. At the referee's discretion, skaters would sit in a penalty box for violating the rules for various reasons, from jams, or face immediate disqualification ejection from the game.
Skaters frequently racked up these penalties and were willing to take it if they felt it would bring them a moral victory.
The team with the most points won the game. If the game was tied in regulation, originally the genders would continue to alternate in sudden death overtime periods until there was a clear winner.
As this could go on for a considerable and indefinite period of time, it was soon replaced one skater from each team facing off in a "Tiebreaker Match Race", five laps around the track and whoever crossed the finish line first won the game for their team.
In addition, special features which were not directly part of the matches would occasionally pop up:.
Another unique concept was that RollerJam held special games, races and competitions in certain episodes, such as:. Other characters included Julie Amazon a bodybuilding skater in Season 4 , Canine and Disable minions of The Prophet who skated for the Sundogs, and "captured" Lindsay Francis during the first game of Season 4 ,Devo a convict character who skated for the Hot Dice , Lil' Nasty a " midget " who was a sidekick to Tim Washington and El Numero A masked luchador who skated for the Enforcers.
The most points ever scored in one jam was 28 in Period 3 of a game between the New York Enforcers and the Illinois Riot. However, the Abrams' turret features composite armoring across both the front and the sides.
In addition, the side skirts of the frontal half of the hull are also made of composite, providing superior ballistic protection against chemical energy munitions such as HEAT rounds.
The composition of the Abrams' composite armor consists of sandwiched plates of non-explosive reactive armor NERA between conventional steel plates.
The NERA plates feature elasticity, allowing them to flex and distort upon perforation, disrupting the penetrating jets of shaped charges and providing more material and space for a kinetic round to pass through, thus providing increased protection compared to conventional steel armor of similar weight.
For the base model M1 Abrams, Steven J. Armor protection was improved by implementing a new special armor incorporating depleted uranium and other undisclosed materials and layouts.
This new armor increased effective armor particularly against kinetic energy rounds  but at the expense of adding considerable weight to the tank, as depleted uranium is 1.
US-based tank battalions participating in Operation Desert Storm received an emergency program to upgrade their tanks with depleted uranium armor immediately before the onset of the campaign.
M1A2 tanks uniformly incorporate depleted uranium armor, and all M1A1 tanks in active service have been upgraded to this standard as well.
The M1A2 SEP variants have been equipped with third generation depleted uranium armor combined with a graphite coating. The M1A2C also features increased physical line-of-sight turret armor.
In , a program was begun to incorporate improved turret side armor into the M1A2. This was intended to offer better protection against rocket-propelled grenades more modern than the baseline RPG These kits were installed on about older M1A2 tanks in and it was also included in upgraded tanks.
The Abrams may also be fitted with explosive reactive armor over the track skirts if needed such as the Tank Urban Survival Kit  and slat armor over the rear of the tank and rear fuel cells to protect against ATGMs.
Protection against spalling is provided by a kevlar liner. The tank has a halon firefighting system to automatically extinguish fires in the crew compartment.
The engine compartment has a firefighting system that is engaged by pulling a T-handle located on the left side of the hull. The Halon gas can be dangerous to the crew.
The crew compartment also contains small hand-held fire extinguishers. Fuel and ammunition are stored in armored compartments with blowout panels to protect the crew from the risk of the tank's own ammunition cooking off exploding if the tank is damaged—the main gun's ammunition is stored in the rear section of the turret, with blast doors that open under power by sliding sideways only to remove a round for firing, then automatically close.
Doctrine mandates that the ammunition door must be closed before arming the main gun. A tank's front armor is much stronger than that on the sides, top, or rear.
In an urban environment, attacks can come from any direction, and attackers can get close enough to reliably hit weak points in the tank's armor or gain sufficient elevation to hit the top armor.
Armor upgrades include reactive armor on the sides of the tank and slat armor similar to that on the Stryker on the rear to protect against rocket-propelled grenades and other shaped charge warheads.
An exterior telephone allows supporting infantry to communicate with the tank commander. The TUSK system is a field-installable kit that allows tanks to be upgraded without needing to be recalled to a maintenance depot.
While the reactive armor may not be needed in most situations, like those present in maneuver warfare , items like the rear slat armor, loader's gun shield, infantry phone which saw use on Marine Corps M1A1s as early as , and Kongsberg Remote Weapons Station for the Deliveries were expected to be completed by April On 8 December , the U.
However, the drawback to the system is that the ATGM is not destroyed, it is merely directed away from its intended target, leaving the missile to detonate elsewhere.
This device is mounted on the turret roof in front of the loader's hatch, and can lead some people to mistake Abrams tanks fitted with these devices for the M1A2 version, since the Commander's Independent Thermal Viewer on the latter is mounted in the same place, though the MCD is box-shaped and fixed in place as opposed to cylindrical and rotating like the CITV.
In , the U. This gun used a license-made tube of the British Royal Ordnance L7 gun together with the vertical sliding breech block and other parts of the U.
TE2 prototype gun. However, it proved to be inadequate; a cannon with lethality beyond the 1. To attain that lethality, the projectile diameter needed to be increased.
Due to the increased calibre, only 40 or 42 rounds are able to be stored depending on if the tank is an A1 or A2 model. The MA1 fires a variety of rounds.
MA1, known as the "Silver Bullet", saw widespread service in the Gulf War, where it proved itself against Iraqi armor such as the T The Abrams uses a manual loader.
The tungsten balls can be used to clear enemy dismounts, break up hasty ambush sites in urban areas, clear defiles , stop infantry attacks and counter-attacks and support friendly infantry assaults by providing covering fire.
It is designed to destroy obstacles and barriers. The round is a modified MA1 with the front fuse replaced by a steel nose to penetrate into the obstacle before detonation.
Army Research Laboratory ARL conducted a thermal analysis of the M from to to evaluate the potential of using a hybrid barrel system that would allow for multiple weapon systems such as the XM Mid- Range munition, airburst rounds, or XM The test concluded that mesh density number of elements per unit area impacts accuracy of the M and specific densities would be needed for each weapon system.
Called the Advanced Multi-Purpose AMP round, it will have point detonation, delay, and airburst modes through an ammunition data-link and a multi-mode, programmable fuse in a single munition.
Having one round that does the job of four would simplify logistics and be able to be used on a variety of targets. The AMP is to be effective against bunkers, infantry, light armor, and obstacles out to meters, and will be able to breach reinforced concrete walls and defeat ATGM teams from to 2, meters.
The XM was a guided munition using a dual-mode seeker that combined imaging-infrared and semi-active laser guidance. The CE variant was chosen due to its better effects against secondary targets, providing a more versatile weapon.
The Abrams tank has three machine guns , with an optional fourth:. The Abrams is equipped with a ballistic fire-control computer that uses user and system-supplied data from a variety of sources to compute, display, and incorporate the three components of a ballistic solution—lead angle, ammunition type, and range to the target—to accurately fire the main gun.
These three components are determined using a laser rangefinder , crosswind sensor, a pendulum static cant sensor, data concerning performance and flight characteristics of each specific type of round, tank-specific boresight alignment data, ammunition temperature, air temperature, barometric pressure, a muzzle reference system MRS that determines and compensates for barrel drop at the muzzle due to gravitational pull and barrel heating due to firing or sunlight, and target speed determined by tracking rate tachometers in the Gunner's or Commander's Controls Handles.
All of these factors are computed into a ballistic solution and updated 30 times per second. The updated solution is displayed in the Gunner's or Tank Commander's field of view in the form of a reticle in both day and Thermal modes.
The ballistic computer manipulates the turret and a complex arrangement of mirrors so that all one has to do is keep the reticle on the target and fire to achieve a hit.
Proper lead and gun tube elevation are applied to the turret by the computer, greatly simplifying the job of the gunner. The fire-control system uses this data to compute a firing solution for the gunner.
Additionally, the Commander's Independent Thermal Viewer CITV on the M1A2 can be used to locate targets and pass them on for the gunner to engage while the commander scans for new targets.
In the event of a malfunction or damage to the primary sight system, the main and coaxial weapons can be manually aimed using a telescopic scope boresighted to the main gun known as the Gunner's Auxiliary Sight GAS.
Turret traverse and main gun elevation can be accomplished with manual handles and cranks in the event of a Fire Control System or Hydraulic System failure.
The commander's M2HB. The loader's M machine gun is aimed either with the built-in iron sights or with a thermal scope mounted on the machine gun.
Preliminary testing showed the upgrades reduced target engagement time from six seconds to three by allowing the commander and gunner to work more closely and collaborate better on target acquisition.
The tank was built around this engine  and it is multifuel—capable, including diesel , kerosene , any grade of motor gasoline , and jet fuel such as JP-4 or JP For logistical reasons, JP-8 is the U.
Honeywell was developing another gas turbine engine with General Electric for the XM Crusader program that was to be a replacement for the Abrams's AGT engine.
General Dynamics has been working on a drop-in diesel engine to replace the gas turbine engine. The engine represents advancements in diesel engine design since the Abrams was first designed, including a common rail fuel injector system where fuel is pressurized and atomized in the cylinder rather than mechanically sprayed.
It also has greater torque, an altered nuclear, biological, and chemical protection system that operates independently of the engine, uses less fuel while idle, is quieter, and gives off significantly less heat and pollutants.
The tracks are a version of the Leopard 2's tracks with different rubber pads and a larger center guide. The improved engine and tracks are not part of an Army upgrade program, but may be included in a near-term engineering change proposal ECP phase.
The new APU will also be more fuel efficient than the tank's main engine. Although the M1 tank is not designed to carry riders easily, provisions exist for the Abrams to transport troops in tank desant with the turret stabilization device switched off.
A battle equipped infantry squad may ride on the rear of the tank, behind the turret. The soldiers can use ropes and equipment straps to provide handholds and snap links to secure themselves.
If and when enemy contact is made, the tank conceals itself allowing the infantry to dismount. Strategic mobility is the ability of the tanks of an armed force to arrive in a timely, cost effective, and synchronized fashion.
The limited capacity two combat-ready tanks in a C-5, one combat-ready tank in a C caused serious logistical problems when deploying the tanks for the first Persian Gulf War, though there was enough time for 1, tanks to be transported by ship.
The HETS can operate on highways, secondary roads, and cross-country. It accommodates the four tank crew members. The first instance of the Abrams being airlifted directly into a battlefield occurred in October From Wikipedia, the free encyclopedia.
For the early 20th Century light tank, see M1 Combat Car. Current U. Type of Main battle tank. Tanks of the United States. Cold War tanks.
List Category. Main article: History of the M1 Abrams. Main article: MBT This section needs to be updated. Please update this article to reflect recent events or newly available information.
January Further information: Military camouflage. Play media. Archived from the original on 25 September Retrieved 30 June Archived from the original on 3 November Retrieved 20 February Archived from the original on 13 December Retrieved 12 December Archived PDF from the original on 19 October Retrieved 19 October United States Army.
Archived from the original on 15 November Retrieved 16 November Jane's Armour and Artillery — Jane's Information Group. Archived from the original on 25 October Army Times.
Archived from the original on 21 July Retrieved 31 December Der Spiegel in German. Archived from the original on 22 October Retrieved 8 November The New York Times.
Archived from the original on 26 August Retrieved 26 August Archived from the original on 23 August Washington Monthly. Archived from the original on 18 June Retrieved 18 June Retrieved 11 April Technology of Tanks Vols London: Janes Information Group.
Internet Archive. New York Times, 20 February Archived from the original on 3 April Retrieved 3 April Army Research Laboratory.
Archived from the original on 18 April Archived from the original on 3 March Project on Government Oversight. GAO, January Quote: " Of the nine Abrams destroyed, seven were due to friendly fire, and two were intentionally destroyed to prevent capture after they became disabled.
Other Abrams tanks were damaged by enemy fire, land mines, on-board fires, or to prevent capture after they became disabled.
Government Accountability Office. Archived from the original PDF on 11 April Retrieved 5 July Archived from the original on 1 June At approximately AM on 27 February, an anti-tank guided missile probably fired from a Bradley struck A in the engine compartment.
The crew, uninjured, was evacuating the disabled tank when two DU rounds hit the tank in the left side of the hull and exited through the right side.
The tank commander, driver, and gunner sustained injuries from fragments. The loader, who was already outside the tank, was uninjured.
A crew members assisted in rescuing A's crew. Archived PDF from the original on 5 May Retrieved 4 April May Archived from the original PDF on 9 April USA Today, 29 March M1 Abrams at War Zenith Press.
Archived from the original on 20 September Archived from the original on 25 November Retrieved 23 May — via news. Retrieved 23 May Potomac Books, , p.
Grove Press, , pp. May—June Archived from the original on 12 March Archived PDF from the original on 5 September Army Battling To Save Equipment".
Washington Post. Archived from the original on 6 October Retrieved 11 October Kongsberg Protech Systems. Archived from the original on 5 October Retrieved 4 October USA Today , 29 March According to some sources he said then:.
The management of the steam mill paid a share of the profit to Ganz. He built his own foundry on this site and started to work there with seven assistants.
They made mostly casting products for the needs of the people of the city. He gave his brother, Henrik a job as a clerk, because of the growing administration work.
He made a profit in the first year, and his factory grew, even though he had not yet engaged in mass production. He won the silver medaille of the exhibition committee and the bronze medaille from Archduke Joseph, Palatine of Hungary.
During the Hungarian Revolution of to the foundry made ten cannons and many cannonballs for the Hungarian army. Because of this, the Military Court of Austria impeached him.
He got seven weeks in prison as penalty, but because of his Swiss citizenship he was acquitted of the charge.
Ganz recognized that, to develop his factory, he had to make products that were mass-produced. At that time, European foundries made wrought iron rims for spoked wagon wheels by pouring the casts in shapes in sand, and leaving them to cool down.
Meanwhile, in the United States and England a better method was being used. This was chill casting , which was invented by the Englishman John Burn in The essence of this process is to cool the cast faster.
The metal will then be harder, and have better wear-resistance. Ganz made one for the first time in and he was able to improve the method further by using antimony.
He got a patent for this invention in We grind it tiny and we make paint or dollop of it. We cover the walls of the casting shape with it, then we dry it and pull it together.
Finally, we heat it to degrees, and the liquid iron is poured into the mold. At the place where the mould walls are coated with said material, a glass hard crust is formed, which - depending on whether the wall of the cover is thinner or thicker - is two, three or four millimeters in thickness.
That is why I have found antimony the best material for the production He used antimony for covering the inner surface of the mold casting to separate the fluid iron from the cooling iron.