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

This paper presents a complete design study of 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, derived from stated assumptions and computed throughout by the accompanying script. The unpolarised specific impulse is 458.9 s. At a polarised fraction of 0.50 it rises to 596.5 s, thrust at the reference mass flow is 117.0 N, and jet power rises to 342.2 kW, so the gain is worth having only where polarisation itself is cheap. Every figure in the study is a computed result of the stated model and nothing was built or tested: the study is SIMULATED, NOT MEASURED, and its limits are stated as plainly as its performance.