Roger Shawyer’s EmDrive poses a question with enormous consequences for spaceflight: could a spacecraft accelerate using electricity without ejecting propellant? In his presentation to the Alternative Propulsion Engineering Conference (APEC), the British engineer connected that proposition to a sweeping vision of superconducting thrusters, personal air vehicles, lunar tourism, and reusable spaceplanes. Along the way, he laid out the proposed physics, demanding engineering requirements, and reported experiments behind his electromagnetic propulsion system. The resulting story reaches well beyond an unusual microwave cavity—it’s about the distance between a laboratory measurement and a technology that could change how people travel through space.

Could a spacecraft move by engineering the gravitational environment around it? For researcher Gary Stephenson, answering that question starts with separating a collection of ideas into specific physical mechanisms, proposed experiments, and unresolved engineering problems. His survey of gravitational field propulsion technologies stretches from superconducting coils and oscillating fusion plasmas to warp drives, quantum transitions, and speculative forms of teleportation. Developed through his volunteer work with the Scientific Coalition for UAP Studies, the project asks whether any of these approaches could help explain unusual aerospace observations—and, more practically, whether they could point toward technologies humans might eventually build.

The propellantless IVO Quantum Drive was tested in orbit. What happened next wasn’t proof—but it wasn’t nothing. Explore the first-of-its-kind orbital test of IVO’s propellantless Quantum Drive, learn what happened in orbit, and how Mike McCulloch’s Quantised Inertia theory may explain the anomalous experimental results.

The former Lockheed Martin Senior Tech Fellow is pursuing coherent matter beams, Casimir power and vacuum-fluctuation propulsion—while also developing practical technologies to make homes more resilient.

Denny Okudinani’s presentation on Viktor Schauberger’s Repulsine offers a unique invitation to look again, build again, and give one of the most mysterious machines in alternative propulsion the patient, hands-on treatment it’s rarely received. With humor, historical curiosity, technical imagination, and sincere respect for Schauberger’s legacy, Okudinani doesn’t simply retell the Repulsine legend. He brings it back to the workbench using 21st century tools and technology.

On a precision scale inside NASA Marshall’s Propulsion Research Laboratory, a small rotor of bismuth spun between magnetic assemblies while Richard H. Eskridge—a veteran Marshall propulsion engineer whose career had ranged from laser propulsion and pulsed power to plasmoid thrusters and advanced-propulsion studies—looked for a signal measured in fractions of a gram but aimed at something larger: the possibility that angular momentum itself, organized through spin and nuclear alignment, could produce a measurable force. The experiment grew from NASA’s Space Act work with Quantum Machines, LLC, whose CEO Chris Milam brought the Pope-Osborne Angular Momentum Synthesis theory to Marshall and funded the effort; Eskridge, Michael A. Nelson, and Michael P. Schoenfeld then helped turn that radical idea into a proposed “spin-coupled force” and a sequence of gyroscope and bismuth-rotor experiments. It was not a finished engine; it was a disciplined attempt to turn a propulsion vision into an instrumented laboratory question: can spin be made to push?

Dr. David Pares describes the Variable Electromagnetic Drive as an experiment born from thunderstorms, fractal antennas, crossed electromagnetic fields, and a quest for propulsion based on natural phenomena. In his latest APEC presentation, Pares showcases AI-assisted software is now helping him model field geometry, configure multi-engine arrays, explore fractal iterations, and automate the startup process of a drive he believes can compress spacetime using electromagnetic structure. Alongside that update, Reid Sherman presented a separate but related milestone: a year-long replication effort that he says produced repeatable directional movement in his own lower-power VEM test setup.

More than two decades ago, NASA’s Breakthrough Propulsion Physics (BPP) program sifted through “impossible” propulsion claims, narrowed them to the most credible test targets, and ran lean feasibility studies. This article turns those results into a field guide for modern researchers—what survived, what failed, and what better instruments have made clearer since.

The last object most people picture when they hear “antigravity” is a cannonball—an iron sphere with the blunt medieval logic of weight and impact. But in Professor Fran De Aquino’s System-H, that heavy ball isn’t a prop. It’s the point. The claim begins with something that looks like it belongs on a 15th-century battlefield, then asks it to behave like a 21st-century anomaly: to grow lighter—not by lifting on air or magnet tricks, but by altering the gravitational bookkeeping itself with extra-low-frequency electromagnetic power at roughly one hertz.

The EmDrive was called “impossible” because it promised propulsion without propellant - but the longer the debate ran, the more impossibility shifted from theory to practice. The hard part wasn’t drawing a cone on a whiteboard—it was engineering the device and a measurement protocol capable of distinguishing micro-thrust from heat, wiring, drift, and electromagnetic side effects.