Rocket Balls - Pentagon's Kinetic Fireball Incendiaries
Rocket Balls are the latest Pentagon secret weapon to be splashed over the Internet. The idea is that you take a hollow sphere with a hole in it, made of rubberized rocket fuel. When lit, the rocket balls get very hot inside, and eject a high temperature exhaust through the hole. Then, they propel themselves every which way, bouncing off hardened walls and breaking through doors into whatever they can get into.
The key element is that they are not intended as explosives; it's the "rocket exhaust" that matters. The burning gas that propels the rocket balls will quickly heat the interior of a building or a bunker to 1,000 degrees Fahrenheit, destroying the contents.
The inventor, Kevin Mahaffy, worked as an engineer at Air Force Research Laboratory's Rocket Propulsion Division, and then spent three years as the Chief of the Motor Branch overseeing solid and hybrid rocket propulsion.
(Gas molecules in a chamber like rocket balls)
The random nature of the motion makes rocket balls ideal for destroying the interior of a structure. This might be your preference when taking out a chemical or biological warfare facility. Rather than blowing it up, and spreading deadly agents over the countryside, the building interior could be destroyed.
A similar idea - called a cracker - was used in Philip E. High's 1968 novel The Time Mercenaries:
The "bumblebees" are alien soldiers chasing the troops. The men retreated down the tunnel in good order, strewing pill-mines and the new human-Revain "crackers" as they went. Before they had gone a hundred yards, there was a livid flash and a brittle explosion. He caught a glimpse of three bumblebees being flung backward in gruesome pieces; behind them, however, the tunnel was packed with the things. A cracker started up, bouncing from roof to floor with each detonation and leaving wide gaps in the black, tightly packed ranks.
From Secret Rocket Balls Target WMD Bunkers; thanks to Winchell Chung for the tip and the sf reference for this article.
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