The Canadian College/University experiments where
high potentials were applied to various parallel-plate
capacitors, suggest a Podkletnov type gravity shielding
or even perhaps a mass cancellation effect at electrostatic
field strengths of 20 Megavolts per meter (20 kilovolts/millimeter)
using hard vacuum dielectric concentric sphere or cylindrical capacitors.
On a beam balance air buoyancy or weight loss would be indistinguishable.
This may allow a spacecraft to cruise at light speed or beyond (FTL-Superluminal velocities).
Possible "cloaking" or the illusion of bone crushing maneuvering too.
Fred
