A Unified Pathfinder Concept

Abstract

This paper evaluates an uncrewed pathfinder mission architecture built by synthesizing seven prior conceptual frameworks. We ask a specific question: if the propulsion gap identified in the Phase-Managed Handover System (PMHS) and Powered Sundiver with Distributed Capture (PSDC) were ever closed, and the Planetary Isochronous Life Model (PILM) were used to choose a direction, how far would a probe realistically travel within an 80-year human research career? The resulting mission architecture separates into four nested tiers: * Tier 0 & 1 (Feasible Now): The Lunar Baseline Calibration Network (LBCN) and the Heliocentric Infrastructure Relay Network (HIRN). Both rely entirely on demonstrated chemical propulsion and gravity-assisted Oberth maneuvers. * Tier 2 & 3 (Propulsion Conditional): A deep-space beacon network spanning the heliopause (~120 AU), Farfarout (~133 AU), and the Oort Cloud (2,000–100,000 AU), alongside interstellar headings toward Proxima Centauri (4.25 ly) and exoplanet candidate HD 137010 b (146 ly). Kinematic modeling reveals that the Tier 2 solar system deployments complete within months to a few decades. Conversely, Tier 3 interstellar vectors present severe constraints. The Proxima Centauri flight clears a human lifetime only under an unproven, continuous 1g acceleration profile. The HD 137010 b vector fails to clear a human lifetime under any modeled acceleration tier, reinforcing its role as a symbolic precursor heading. Crucially, isolating PSDC’s trajectory contribution reveals an architectural paradox. Incorporating a realistic 2-year solar-drop phase makes a rendezvous mission slower, not faster, compared to a direct PMHS constant-acceleration cruise. The upfront temporal penalty cannot be recovered at the modeled distances, demonstrating that the solar-diver mechanism is optimized for mass-efficient orbital capture rather than rapid transit to rest. This revision introduces a hardware-layer specification for the network's deployment nodes: Project PSARB (Poloidal-Shielded Analog Relay Buffer). PSARB addresses deep-space data survival, thermal transport, radiation protection, and bandwidth saturation via a decoupled, four-pillar system. Finally, we audit the fluid-dynamics framework underlying PSARB’s internal concentric-baffle-vessel heat exchanger. We find that while its dimensionless resistance-partitioning optimization holds, its original empirical validation anchor is mismatched. The underlying study relies on a high-Reynolds separated turbulent shear flow, whereas PSARB’s liquid-metal Galinstan loop operates in a strongly magnetohydrodynamic Hartmann-flow regime. This paper maps out exactly where these architectural connections hold and defines the specific empirical gates required before they can be leveraged for flight hardware.