Regards the behavior of rapid acceleration away from Earth & needing "no fuel" by UFO/UAP's, neodymium magnets fade-10%/1000yrs, these power fluid_impulse motors that are a directed_force from the curve in pipes, that is, a #jetboard in a box, a tank, pumps & pipes don't need air to fly. This is a strong force, a hovercraft design for a 1000gal firefighting and high-mt SAR & Utility having no propwash is the need, spec is 45 metric tons-force, 7.5t each with 6-motors for dynamics powered by magnets so need no_inputs for centuries to gain torque, works under water, eh? To separate from large bodies at takeoff: The Moon is an astro-capacitor ambient charge -100vdc/m from grains having electronic properties,  antennas at certain frequency will repel them, reactance_reluctance repulsion, a shield of these or coatings acting as antennas can hover the craft when close enough, this shades gravity for takeoff, the F.g fades as 1/d² so gets less as d² grows with altitude. There is no need for "antigravity". To make 90° turns the craft stops using the antennas against the fluid it's in to reduce g's in that direction, flips 90° to the new direction and zips off the cushion anew, surface coatings allow plasmas to nullify the boundary_layer in them for low drag if not to help accelerate for top-end speeds. The fluid_impulse motors don't exist, I'm a shop guy & can make them, my uncle was a plumber, ask one that does high-pressure sprinkler systems if pipes can fly. Cheers, 🍺