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There was a QI drive that was to be tested by the Barry-1 satellite (launched on a routine cheap rideshare by Elon's partially reusable Falcon 9 launch vehicle). But the satellite suffered a power failure before the propellantless drive can be started.

With routine Falcon 9 flights every 3-4 days, there will be another chance to test that theory with a reactionless drive in orbit. With daily fully reusable Starship flights, there will be orders of magnitude more chances to test.

It will be interesting if such a drive can raise a small satellite's orbit.

Let's say, if it works, combined with cheap daily fully reusable launches to low earth orbit, it's going to have a significant impact on spaceflight.