The Bias drive reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Bias drive

A concept from NASA's Breakthrough Propulsion Physics Program, the bias drive is a pitch drive that functions by altering the gravitational constant G in front of and behind the craft. One problem with this concept is that it would create a singularity in the field's gradient located inside the vehicle.

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