Design Blueprint: Spin-Polarised Propellant Thruster: Thrust and Specific Impulse from Torsion-Assisted Exhaust Expansion

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24123364): The device is a magnetic-nozzle thruster fed with hydrogen whose nuclei are spin-polarised before ionisation, so that the expansion of the exhaust through the nozzle is assisted by the torsion coupling of the aligned spin population. Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.