The Emthruster: Thrust without reaction?

[radtech497]

I just came upon this paper, which describes an eight-day experiment at the Johnson Space Center on a device that uses microwaves in a resonant cavity to generate (a very small) thrust without propellants. If this report is taken at face value (apparently, the experiment had previously been conducted in China; see attached PDF), this could lead (after much improvement, of course) to a reaction-less drive. Articles describing the experiment are available here and here.

Radtech497