Berkeley CSUA MOTD:Entry 51595
Berkeley CSUA MOTD
2019/06/27 [General] UID:1000 Activity:popular

2008/10/21-26 [Reference/Military] UID:51595 Activity:low
10/20   How come aircraft like A-10 can disable a modern tank with a 30mm
        cannon while tanks need 125mm or larger guns to penetrate each other's
        \_ That's a good question.  Maybe it's the angle of the incoming
           shells compared to the armor?  The machine gun effect?  Shorter
           range on the 30mm gun?
        \_ It's about range and rate of engagement, though I can't find a
           citation.  3km+ vs. ~1.2 km. Also compare how many kills with a
           fully loaded A-10 vs. an M1A1.
        \_ Insurgents don't have tanks.
        \_ depleted uranium rounds
        \_ Maybe it's also because tanks are more havily armoured on the sides
           (against other tanks and RPGs) than on the top?
           \_ Yes, tanks generally have weaker armor on top and below, making
              them more vulnerable to vertical fire.  Also their armor is
              sloped, making it more effective against horizontal ground fire
              than vertical fire.  Their most effective armor is designed to
              protect against frontal fire.
              \_ Which is the idea behind the Javelin
                 \_ This is TOTALLY COOL. I love our military.
                    \_ Cf. its inspiration, the Roman pila (singular: pilum).
                    \_ Cf. its inspiration, the Roman Plumbata.
2019/06/27 [General] UID:1000 Activity:popular

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Full specifications Javelin is a portable anti-tank weapon, supplied by Raytheon / Lockheed Martin Javelin joint venture. It is shoulder-fired and can also be installed on tracked, wheeled or amphibious vehicles. In 1989, the US Army awarded a contract for the development of Javelin as a replacement for the M47 Dragon anti-tank missile. The Javelin joint venture was formed by Texas Instruments (now Raytheon Missile Systems) of Dallas, Texas and Lockheed Martin Electronics and Missiles (now Missiles and Fire Control), of Orlando, Florida. Raytheon is responsible for the command launch unit (CLU), missile guidance electronic unit, system software and system engineering management. Lockheed Martin is responsible for the missile seeker, missile engineering and assembly. "Javelin is a shoulder-fired, portable anti-tank weapon." Javelin entered full-rate production in 1994 and the systems were first deployed in June 1996 by the US Army at Fort Benning, Georgia. The Javelin system saw operational service with the US Army and Marine Corps and Australian Special Forces during Operation Iraqi Freedom in March / April 2003. In January 2003, the UK Ministry of Defence announced that it had decided to procure Javelin for the light forces anti-tank guided weapon system (LFATGWS) requirement. Javelin replaces the Milan system and entered service with British Army in July 2005. Javelin will equip the army's rapid reaction forces, including 16 air assault brigade, three commando brigade and mechanised infantry. BAE Systems and a number of other UK companies are providing subsystems for the missiles. In October 2004, a further order was placed, to equip the armoured infantry and formation reconnaissance forces from 2007, replacing the Swingfire ATGW. Over 20,000 missiles have been produced and over 3,000 command launch units. Javelin has also been selected by Taiwan (60 launchers and 360 missiles), Lithuania, Jordan (30 launchers and 110 missiles), Australia (up to 92 systems and 600 missiles), New Zealand (24 launchers, delivered in June 2006), Norway (90 launchers and 526 missiles, delivery from 2006), Ireland and Canada (200 launchers and 840 missiles). In June 2004, the Czech Republic signed a Letter of Agreement (LOA) with the US government to provide the Javelin system. In November 2004, the United Arab Emirates requested the foreign military sale (FMS) of 100 Javelin launchers and 1,000 missile rounds. In June 2006, Oman requested the FMS of 30 launchers and 250 missiles. In July 2006, Bahrain requested the FMS of 60 launchers and 180 missiles. Contracts for the supply of the missile system to UAE and Oman were placed in July 2008. "The Javelin anti-armour missile is autonomously guided to the target, leaving the gunner free to reposition or reload immediately." Successful qualification firings took place in January 2007. Missile The Javelin system consists of the CLU and the round. The CLU, with a carry weight of 64kg, incorporates a passive target acquisition and fire control unit with an integrated day sight and a thermal imaging sight. The sight uses DRS Technologies second-generation thermal imaging technology, based on the standard advanced Dewar assembly (SADA IIIA). The company also provides the quieter, dual-opposed piston coolers for the sight. The gunner's controls for the missile system are on the CLU. The day sight is equipped with x4 magnification and the night sight with x4 and x9 magnification optics. The round consists of the Javelin missile and the ATK (Alliant Techsystems) launch tube assembly. Javelin is a fire-and-forget missile with lock-on before launch and automatic self-guidance. The missile is equipped with an imaging infrared seeker which is based on a cadmium mercury telluride (CdHgTe) 64 x 64 staring focal plane array in the 8 to 12 micron waveband. BAE Systems Avionics is providing the infrared seekers for the British Army's missiles. The tandem warhead is fitted with two shaped charges: a precursor warhead to initiate explosive reactive armour and a main warhead to penetrate base armour. The propulsion system is a two-stage solid propellant design which provides a minimum smoke soft launch. The block 1 missile upgrade includes an improved rocket motor which reduces time of flight, an enhanced warhead effective against a greater range of targets, and improvements to the command launch unit and software. Operation The system is deployed and ready to fire in less than 30 seconds and the reload time is less than 20 seconds. The missile is mounted on the CLU and the gunner engages the target using the sight on the CLU, by placing a curser box over the image of the target. The gunner locks on the automatic target tracker in the missile by sending a lock-on-before-launch command to the missile. When the system is locked-on, the missile is ready to fire and the gunner does not carry out post launch tracking or missile guidance. "The Javelin system is deployed and ready to fire in less than 30 seconds and the reload time is less than 20 seconds." Unlike conventional wire guided, fibre-optic cable guided, or laser beam riding missiles, Javelin is autonomously guided to the target after launch, leaving the gunner free to reposition or reload immediately after launch. A soft launch ejects the missile from the launch tube to give a low-recoil shoulder launch. The soft launch enables firing from inside buildings or covered positions. Once the missile is clear, the larger propellant in the second stage is ignited and the missile is propelled towards the target. The gunner selects direct attack mode to engage covered targets, bunkers, buildings and helicopters. The top attack mode is selected against tanks, in which case the Javelin climbs above and strikes down on the target to penetrate the roof of the tank where there is the least armour protection. The missile is launched at an 18 elevation angle to reach a peak altitude of 150m in top attack mode and 50m in direct fire mode.