https://wiki.naturalphilosophy.org/index.php?action=history&feed=atom&title=Category%3APropulsion 2026-07-21T20:42:16Z Revision history for this page on the wiki MediaWiki 1.43.0 https://wiki.naturalphilosophy.org/index.php?title=Category:Propulsion&diff=303238&oldid=prev 2026-07-20T13:44:16Z

<p>Create/expand category description</p> <p><b>New page</b></p><div>This category collects work on &#039;&#039;&#039;unconventional propulsion&#039;&#039;&#039; — proposals and devices intended to produce thrust without expelling propellant, or by means outside conventional rocketry and aerodynamics.<br /> <br /> It covers inertial and reactionless drives, magnetic and electromagnetic propulsion, magnetic motors, gyroscopic and mechanical devices claimed to produce net force, and field-propulsion concepts drawing on gravity control.<br /> <br /> The central objection to all of it is conservation of momentum: a closed system cannot accelerate its centre of mass without expelling something. Researchers here divide between those who accept the principle and argue that their device interacts with an external medium — an aether, the vacuum field, or the distant matter of the universe by way of [[:Category:Mach&#039;s Principle]] — and those who hold that the conservation law is itself an approximation. Related categories: [[:Category:Antigravity]], [[:Category:New Energy]], [[:Category:Zero Point Energy]].<br /> <br /> [[Category:New Energy]]</div>

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