Feasibility Analysis of a Superconducting Magnetic-Gradient-Coupled Vehicle

Michael Anthony FlemingA vehicle is analyzed that carries a superconducting magnetic dipole and derives force by coupling to an externally engineered magnetic-field gradient rather than by aerodynamic lift or reaction propulsion, governed by the dipole-gradient force F = ∇(m·B). Using a filamentary line-current numerical model, this study evaluates viability at realistic mass, force-to-weight ratio, stability, and control authority. Four findings are robust: natural planetary fields are insufficient by roughly nine orders of magnitude, so an engineered gradient source is required; copper conductors are excluded by mass and ohmic power, making high-temperature superconductivity a precondition; a superconducting vehicle of a few tonnes in an MRI-class gradient achieves a static force-to-weight ratio above four; and the vehicle is Earnshaw-unstable but slowly (growth rate ~1.6/s), appearing controllable in principle. A central architectural result: a six-pod vehicle with axial magnetic moments provides only rank-3 control authority (thrust plus two tilt torques), with lateral translation structurally unreachable by current modulation. The analysis narrows the concept to a well-defined set of open questions rather than validating a finished vehicle. This is a feasibility analysis inviting technical review, not a proven engineering result.