A Skeptical Reaction to Reactionless Drives
8 June 2026
Although the chemicals in rocket propulsion have changed over the years, from kerosene and liquid hydrogen, to complex ammonium perchlorate compounds and more recently liquid methane and oxygen, the basic idea of how it all works is the same - following Newton's idea of action and reaction (or conservation of momentum), if you shove stuff out the back of a rocket, it pushes the rocket forward. The more mass you shove out, and the faster it's shoved, the quicker the rocket moves.