Bionic Arm Powered by Rockets

A diagram of the rocket-powered arm. The propellant cartridge contains pressurized liquid hydrogen peroxide. The hydrogen peroxide is routed through two flexible lines (not shown) across the elbow joint and into two catalyst packs—one for the elbow, one for the forearm. The catalyst burns the hydrogen peroxide, generating steam that pushes pistons up and down. Credit: Michael Goldfarb.