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Explainer: Naming of Parts for an Instrument of Civilian Slaughter

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American


The PTAB 2.5M anti-armor bomblet has a cylindrical body with a dome-shaped ballistic cap at its front and it terminates in a four-fin tail unit that is structured in a drum configuration. In its Aug. 2, 2012 online posting, Jane's Air-Launched Weapons noted that the tail unit comes in both short and long versions.

The entire bomblet measures 0.87 meters in length, has a body diameter of 60 millimeters and weighs 2.5 kilograms. Just behind the nose is a shaped charge weighing 660 grams and consisting of a RDX/TNT mixture, which is detonated by an ADTS-583 impact fuze.

Thirty or more bomblets, or sub-munitions, fit into the RBK-250-275 cluster bombs and the RBK 500 can carry 75. The PTAB 2.5M is able to penetrate up to 120 millimeters of armor. The Soviets originally designed the PTAB 2.5M to be dropped on lines of Allied tanks steadily advancing toward the Iron Curtain countries. On Dec 12, while many were fretting or making jokes about the Mayan Apocalypse, Syrian military aircraft released RBK 250s on the civilian population of Marea, near Aleppo. For a few civilians from Marea, the world did end.


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Gary Stix, Scientific American's neuroscience and psychology editor, commissions, edits and reports on emerging advances and technologies that have propelled brain science to the forefront of the biological sciences. Developments chronicled in dozens of cover stories, feature articles and news stories, document groundbreaking neuroimaging techniques that reveal what happens in the brain while you are immersed in thought; the arrival of brain implants that alleviate mood disorders like depression; lab-made brains; psychological resilience; meditation; the intricacies of sleep; the new era for psychedelic drugs and artificial intelligence and growing insights leading to an understanding of our conscious selves. Before taking over the neuroscience beat, Stix, as Scientific American's special projects editor, oversaw the magazine's annual single-topic special issues, conceiving of and producing issues on Einstein, Darwin, climate change, nanotechnology and the nature of time. The issue he edited on time won a National Magazine Award. Besides mind and brain coverage, Stix has edited or written cover stories on Wall Street quants, building the world's tallest building, Olympic training methods, molecular electronics, what makes us human and the things you should and should not eat. Stix started a monthly column, Working Knowledge, that gave the reader a peek at the design and function of common technologies, from polygraph machines to Velcro. It eventually became the magazine's Graphic Science column. He also initiated a column on patents and intellectual property and another on the genesis of the ingenious ideas underlying new technologies in fields like electronics and biotechnology. Stix is the author with his wife, Miriam Lacob, of a technology primer called Who Gives a Gigabyte: A Survival Guide to the Technologically Perplexed (John Wiley & Sons, 1999).

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