From Jasper Hamill's 4-18-19 Metro article entitled "The U.S. Navy Secretly Designed a Super-fast Futuristic Aircraft Resembling a UFO, Documents Reveal":
"The U.S. Navy has been granted a patent for an advanced aircraft which resembles a flying saucer UFO.
inventors filed plans for a highly unusual flying machine which uses an
‘inertial mass reduction device’ to travel at ‘extreme speeds’.
that means is that the aircraft uses complex technology to reduce its
mass and thereby lessen inertia (an object’s resistance to motion) so it
can zoom along at high velocities.
patent is highly complex and describes methods of reducing the mass of
an aircraft using various techniques including the generation of gravity
waves, which were first detected in 2016 after being produced when two
black holes collided.
is possible to reduce the inertial mass and hence the gravitational
mass, of a system/object in motion, by an abrupt perturbation of the
non-linear background of local spacetime,’ the patent says.
craft described in the patent features a cavity wall filled with gas,
which is then made to vibrate using powerful electromagnetic waves."
This then creates a vacuum around the craft, allowing it to propel itself at high speeds.
The UFO-style ship can be used in water, air or even space.