United States Patent US3322374A: Magnetohydrodynamic Propulsion Apparatus (Foundational MHD Patent)
Patent Number: US3322374A Title: Magnetohydrodynamic Propulsion Apparatus Filed: 1967 Jurisdiction: United States (US) Classification: B64G1/409 (Unconventional spacecraft propulsion systems) Track Directory (Physics_Math): 1_Track/ — foundational MHD J×B body force propulsion apparatus; baseline patent for atmospheric, marine, and space MHD propulsion; direct ancestor of Attempt 1 rotating EM field research
Image files:
patents_intl/tweets/raw_download/1983268121365623129_1.jpg(Grok AI analysis page referencing the patent)
Overview
US3322374A is one of the foundational US patents for MHD propulsion of aircraft/spacecraft — filed in 1967 at a time when MHD generators were being actively developed for power applications and the physics community was exploring MHD propulsion for submarine drives (which were demonstrated and fielded in Japan as the Yamato-1 in 1992).
Physics Mechanism: J × B Body Force Propulsion in Conducting Media
The patent describes a craft using plasma for propulsion in air, water, or space — no wings, no propeller, no conventional engine. The MHD body-force propulsion principle: a conducting fluid (atmosphere, seawater, or injected plasma) passes through a region of crossed electric (E) and magnetic (B) fields. The Lorentz force density:
f = J × B
acts on the conducting medium, accelerating it rearward and by Newton's third law propelling the craft forward.
In atmosphere, the air itself is the conducting medium, requiring either pre-ionization (plasma generation) or operation at field strengths sufficient to cause impact ionization of air molecules by accelerated electrons.
Historical Significance
The 1967 US patent date is significant: it establishes that the US defense and aerospace community had formal IP protection on MHD air/water/space propulsion at the height of the classified aerospace programs that produced the SR-71 (first flight 1964) and the various successor programs at Lockheed's Skunk Works.
A tweet from the same archive cites Grok AI's analysis connecting US3322374A to the "Tic-Tac" UAP encounters, noting the correspondence between the craft's flight envelope (instantaneous acceleration, transmedium travel, no visible exhaust) and the kinematic capabilities of an MHD-propelled vehicle.
Lineage and Descendant Patents
US3322374A is the baseline patent whose principles appear — in more sophisticated implementations — throughout the international patent archive documented in this Physics_Math collection:
| Descendant Patent | Jurisdiction | Enhancement |
|---|---|---|
| CN111038740A | China (2020) | Rotating ring coil array — spherical vehicle |
| RU2106287C1 | Russia (1998) | 16-coil array + rim emitters — disc vehicle, dual-mode |
| US8006939B2 | US (2011) | Traveling-wave surface implementation — Lockheed |
| RU2046210C1 | Russia (1995) | Nuclear ionizer + coaxial electrodes — space operation |
| CN111114774B | China (2021) | AC magnetic field × ion current — separate lift and thrust modules |
The 1967 date establishes that MHD propulsion was known and protected as IP concurrent with the same era that produced the classified aerospace vehicles most associated with the "black programs" — SR-71, A-12, and successors — raising the question of whether classified operational MHD-propelled vehicles were developed contemporaneously and simply not publicly disclosed.
Sources
- US3322374A search on Google Patents
- Yamato-1 MHD submarine demonstration, Japan, 1992
- SR-71 development timeline, Lockheed Skunk Works, 1964
This information was compiled from Break_thrus.mdx staging file.