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Via Jerry Pournelle - a working reactionless drive?
A chinese research professor, Yang Juan, professor of propulsion theory and engineering of aeronautics and astronautics at the Northwestern Polytechnic University in Xian, claims in a peer reviewed journal to have built a model that produces 720 mN from 2.5 kw of input power.
If that holds up, it is revolutionary. Professor Yang is at this time unable to answer questions about the device, and it is not available for inspection by Aviation Week or anyone else so far as Aviation Week can determine.

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