Henry Bull’s 1935 Impulse Engine - How It Works (Animated Cycle) #1640935 (License: Personal Use)

This diagram visualizes the five-phase operational cycle of Henry Bull’s 1935 impulse engine, where internal spring-mass interactions create motion without external propulsion. Each stage-spring compression, release, mass impact, retraction, and recompression-produces equal and opposite forces, yielding net zero thrust as indicated at each step. The yellow arrows denote direction of internal motion, while black components represent fixed or moving masses within the sealed cylinder.

Used in educational physics articles, engineering history pages, or debunking perpetual motion claims; targets users seeking technical understanding of closed-system momentum devices and why they cannot produce net thrust.