
A propellantless engine — the Vacuum-Resonant Constant-Acceleration Drive Ivanov(VRDPU-I) — is proposed. It extracts energy directly from the physical vacuum viacontrolled phase transition of the hyperbolic lattice {5,3,3}. The engine delivers constant proper acceleration of 1–3 mm/s² with zero propellantconsumption. Based on this engine, the interstellar spacecraft “Orion-1729P” has beendesigned:• ship time to Proxima Centauri b — 8.24 years• Earth time — 9.61 years• maximum velocity 0.818 c All calculations are performed rigorously within Ivanov’s cubic vacuum metric. The spacecraft is currently at the design stage.
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