>>It appears that if the gravitomagnetic field really does exist, then it may be possible to build an antigravity propulsion engine There is little doubt of its existence. It is very much the relativistic equivalent of the magnetic field for a charge in motion, but occurs when mass has a speed component. However, it is not actually a magnetic field. >>About a year ago when I suggested on sciforums that the precession of a gyroscope is the result of the gravitomagnetic field being converted into a dipolar gravitational field, I was laughed at... Yes, frame dragging is expected to effect the precession of a number of gyroscopes on Gravity Probe B. If you derived this without prior knowledge of this effect, you're done well Please Register or Log in to view the hidden image! Sorry to dampen your enthusiasm- It always seems that whatever we are capable of thinking of, someone has already done so.