Gravitomagnetic Propulsion?

More about Gravitomagnetic Propulsion?

Two large metal cylinders spin on a common axis, in opposite directions. Their high moment of inertia drags spacetime round with them. ("Frame Dragging".) This is called gravitomagnetism by analogy with electromagnetism caused by spinning electrons. To avoid needing a motor to turn the cylinders, we can make them the rotor of an electric motor by surrounding them with coils into which a multi-phase electronic oscillator supplies AC. (This is how the motor in a HDD or floppy drive is driven.) In practice, instead of solid metal, a toroidal tube full of a conductive substance (such as Mercury) would be used, its contents being pumped round by the flux for the coils. Note that because gravity is so weak, we need a lot of mass (or moment of inertia) in our rotors.