Quantum Crystal Surf Drive (QCSD) v6.2 — Complete Theoretical Framework for Fuel-Free Propulsion Autor: Fildán, Karel

Complete theoretical framework for fuel-free propulsion using Floquet-type time crystals based on NV centers in isotopically purified diamond. Version 6.2 restructures the limitations section into Stage 1 (table-top experiment) and Level 3 (hull-scale implementation) categories. Includes formal proof of net momentum asymmetry from first principles (Floquet perturbation theory + time-reversal symmetry breaking). Priority timestamp: April 8, 2026.